--- _id: '22724' abstract: - lang: eng text: "\r\nPredictive Maintenance as a desirable maintenance strategy in industrial applications relies on suitable condition monitoring solutions to reduce costs and risks of the monitored technical systems. In general, those solutions utilize model-based or data-driven methods to diagnose the current state or predict future states of monitored technical systems. However, both methods have their advantages and drawbacks. Combining both methods can improve uncertainty consideration and accuracy. Different combination approaches of those hybrid methods exist to exploit synergy effects. The choice of an appropriate approach depends on different requirements and the goal behind the selection of a hybrid approach.\r\n\r\n \r\n\r\nIn this work, the hybrid approach for estimating remaining useful lifetime takes potential uncertainties into account. Therefore, a data-driven estimation of new measurements is integrated within a model-based method. To consider uncertainties within the system, a differentiation between different system behavior is realized throughout diverse states of degradation.\r\n\r\nThe developed hybrid prediction approach bases on a particle filtering method combined with a machine learning method, to estimate the remaining useful lifetime of technical systems. Particle filtering as a Monte Carlo simulation technique is suitable to map and propagate uncertainties. Moreover, it is a state-of-the-art model-based method for predicting remaining useful lifetime of technical systems. To integrate uncertainties a multi-model particle filtering approach is employed. In general, resampling as a part of the particle filtering approach has the potential to lead to an accurate prediction. However, in the case where no future measurements are available, it may increase the uncertainty of the prediction. By estimating new measurements, those uncertainties are reduced within the data-driven part of the approach. Hence, both parts of the hybrid approach strive to account for and reduce uncertainties.\r\n\r\n \r\n\r\nRubber-metal-elements are employed as a use-case to evaluate the developed approach. Rubber-metal-elements, which are used to isolate vibrations in various systems, such as railways, trucks and wind turbines, show various uncertainties in their behavior and their degradation. Those uncertainties are caused by diverse inner and outer factors, such as manufacturing influences and operating conditions. By expert knowledge the influences are described, analyzed and if possible reduced. However, the remaining uncertainties are considered within the hybrid prediction method. Relative temperature is the selected measurand to describe the element’s degradation. In lifetime tests, it is measured as the difference between the element’s temperature and the ambient temperature. Thereby, the influence of the ambient temperature on the element’s temperature is taken into account. Those elements show three typical states of degradation that are identified within the temperature measurements. Depending on the particular state of degradation a new measurement is estimated within the hybrid approach to reduce potential uncertainties.\r\n\r\nFinally, the performance of the developed hybrid method is compared to a model-based method for estimating the remaining useful lifetime of the same elements. Suitable performance indices are implemented to underline the differences between the results." author: - first_name: Amelie full_name: Bender, Amelie id: '54290' last_name: Bender - first_name: Walter full_name: Sextro, Walter id: '21220' last_name: Sextro citation: ama: 'Bender A, Sextro W. Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties. In: Do P, King S, Fink Olga, eds. Proceedings of the European Conference of the PHM Society 2021. Vol 6. ; 2021. doi:https://doi.org/10.36001/phme.2021.v6i1.2843 ' apa: Bender, A., & Sextro, W. (2021). Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties. In P. Do, S. King, & Olga Fink (Eds.), Proceedings of the European Conference of the PHM Society 2021 (Vol. 6, Issue 1). https://doi.org/10.36001/phme.2021.v6i1.2843 bibtex: '@inproceedings{Bender_Sextro_2021, title={Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties}, volume={6}, DOI={https://doi.org/10.36001/phme.2021.v6i1.2843 }, number={1}, booktitle={Proceedings of the European Conference of the PHM Society 2021}, author={Bender, Amelie and Sextro, Walter}, editor={Do, Phuc and King, Steve and Fink, Olga}, year={2021} }' chicago: Bender, Amelie, and Walter Sextro. “Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties.” In Proceedings of the European Conference of the PHM Society 2021, edited by Phuc Do, Steve King, and Olga Fink, Vol. 6, 2021. https://doi.org/10.36001/phme.2021.v6i1.2843 . ieee: 'A. Bender and W. Sextro, “Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties,” in Proceedings of the European Conference of the PHM Society 2021, 2021, vol. 6, no. 1, doi: https://doi.org/10.36001/phme.2021.v6i1.2843 .' mla: Bender, Amelie, and Walter Sextro. “Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties.” Proceedings of the European Conference of the PHM Society 2021, edited by Phuc Do et al., vol. 6, no. 1, 2021, doi:https://doi.org/10.36001/phme.2021.v6i1.2843 . short: 'A. Bender, W. Sextro, in: P. Do, S. King, Olga Fink (Eds.), Proceedings of the European Conference of the PHM Society 2021, 2021.' conference: end_date: 2021-07-02 name: 6th European Conference of Prognostics and Health Management start_date: 2021-06-28 date_created: 2021-07-14T06:29:08Z date_updated: 2023-09-22T07:19:48Z department: - _id: '151' doi: 'https://doi.org/10.36001/phme.2021.v6i1.2843 ' editor: - first_name: 'Phuc ' full_name: 'Do, Phuc ' last_name: Do - first_name: Steve full_name: King, Steve last_name: King - first_name: ' Olga' full_name: Fink, Olga last_name: Fink intvolume: ' 6' issue: '1' keyword: - Hybrid prediction method - Multi-model particle filtering - Uncertainty quantification - RUL estimation language: - iso: eng main_file_link: - open_access: '1' url: https://papers.phmsociety.org/index.php/phme/article/view/2843 oa: '1' publication: Proceedings of the European Conference of the PHM Society 2021 publication_identifier: unknown: - 978-1-936263-34-9 publication_status: published quality_controlled: '1' status: public title: Hybrid Prediction Method for Remaining Useful Lifetime Estimation Considering Uncertainties type: conference user_id: '54290' volume: 6 year: '2021' ... --- _id: '21232' article_number: '106389' author: - first_name: Dominik full_name: Itner, Dominik last_name: Itner - first_name: Hauke full_name: Gravenkamp, Hauke last_name: Gravenkamp - first_name: Dmitrij full_name: Dreiling, Dmitrij id: '32616' last_name: Dreiling - first_name: Nadine full_name: Feldmann, Nadine id: '23082' last_name: Feldmann - first_name: Bernd full_name: Henning, Bernd id: '213' last_name: Henning citation: ama: Itner D, Gravenkamp H, Dreiling D, Feldmann N, Henning B. Efficient semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric loads. Ultrasonics. Published online 2021. doi:10.1016/j.ultras.2021.106389 apa: Itner, D., Gravenkamp, H., Dreiling, D., Feldmann, N., & Henning, B. (2021). Efficient semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric loads. Ultrasonics, Article 106389. https://doi.org/10.1016/j.ultras.2021.106389 bibtex: '@article{Itner_Gravenkamp_Dreiling_Feldmann_Henning_2021, title={Efficient semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric loads}, DOI={10.1016/j.ultras.2021.106389}, number={106389}, journal={Ultrasonics}, author={Itner, Dominik and Gravenkamp, Hauke and Dreiling, Dmitrij and Feldmann, Nadine and Henning, Bernd}, year={2021} }' chicago: Itner, Dominik, Hauke Gravenkamp, Dmitrij Dreiling, Nadine Feldmann, and Bernd Henning. “Efficient Semi-Analytical Simulation of Elastic Guided Waves in Cylinders Subject to Arbitrary Non-Symmetric Loads.” Ultrasonics, 2021. https://doi.org/10.1016/j.ultras.2021.106389. ieee: 'D. Itner, H. Gravenkamp, D. Dreiling, N. Feldmann, and B. Henning, “Efficient semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric loads,” Ultrasonics, Art. no. 106389, 2021, doi: 10.1016/j.ultras.2021.106389.' mla: Itner, Dominik, et al. “Efficient Semi-Analytical Simulation of Elastic Guided Waves in Cylinders Subject to Arbitrary Non-Symmetric Loads.” Ultrasonics, 106389, 2021, doi:10.1016/j.ultras.2021.106389. short: D. Itner, H. Gravenkamp, D. Dreiling, N. Feldmann, B. Henning, Ultrasonics (2021). date_created: 2021-02-15T09:53:32Z date_updated: 2023-09-25T08:09:24Z department: - _id: '49' doi: 10.1016/j.ultras.2021.106389 language: - iso: eng project: - _id: '89' grant_number: '409779252' name: Vollständige Bestimmung der akustischen Materialparameter von Polymeren publication: Ultrasonics publication_identifier: issn: - 0041-624X publication_status: published quality_controlled: '1' status: public title: Efficient semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric loads type: journal_article user_id: '32616' year: '2021' ... --- _id: '29936' author: - first_name: Arjun full_name: Ramaswami, Arjun id: '49171' last_name: Ramaswami orcid: https://orcid.org/0000-0002-0909-1178 - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Thomas full_name: Kühne, Thomas id: '49079' last_name: Kühne - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 citation: ama: 'Ramaswami A, Kenter T, Kühne T, Plessl C. Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing. In: Applied Reconfigurable Computing. Architectures, Tools, and Applications. Springer International Publishing; 2021. doi:10.1007/978-3-030-79025-7_21' apa: Ramaswami, A., Kenter, T., Kühne, T., & Plessl, C. (2021). Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing. In Applied Reconfigurable Computing. Architectures, Tools, and Applications. Int. Conf. on Applied Reconfigurable Computing. Architectures, Tools, and Applications. Springer International Publishing. https://doi.org/10.1007/978-3-030-79025-7_21 bibtex: '@inbook{Ramaswami_Kenter_Kühne_Plessl_2021, place={Cham}, title={Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing}, DOI={10.1007/978-3-030-79025-7_21}, booktitle={Applied Reconfigurable Computing. Architectures, Tools, and Applications}, publisher={Springer International Publishing}, author={Ramaswami, Arjun and Kenter, Tobias and Kühne, Thomas and Plessl, Christian}, year={2021} }' chicago: 'Ramaswami, Arjun, Tobias Kenter, Thomas Kühne, and Christian Plessl. “Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing.” In Applied Reconfigurable Computing. Architectures, Tools, and Applications. Cham: Springer International Publishing, 2021. https://doi.org/10.1007/978-3-030-79025-7_21.' ieee: 'A. Ramaswami, T. Kenter, T. Kühne, and C. Plessl, “Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing,” in Applied Reconfigurable Computing. Architectures, Tools, and Applications, Cham: Springer International Publishing, 2021.' mla: Ramaswami, Arjun, et al. “Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing.” Applied Reconfigurable Computing. Architectures, Tools, and Applications, Springer International Publishing, 2021, doi:10.1007/978-3-030-79025-7_21. short: 'A. Ramaswami, T. Kenter, T. Kühne, C. Plessl, in: Applied Reconfigurable Computing. Architectures, Tools, and Applications, Springer International Publishing, Cham, 2021.' conference: name: Int. Conf. on Applied Reconfigurable Computing. Architectures, Tools, and Applications date_created: 2022-02-21T14:22:01Z date_updated: 2023-09-26T11:40:45Z department: - _id: '27' - _id: '518' - _id: '304' doi: 10.1007/978-3-030-79025-7_21 language: - iso: eng place: Cham publication: Applied Reconfigurable Computing. Architectures, Tools, and Applications publication_identifier: isbn: - '9783030790240' - '9783030790257' issn: - 0302-9743 - 1611-3349 publication_status: published publisher: Springer International Publishing quality_controlled: '1' status: public title: Evaluating the Design Space for Offloading 3D FFT Calculations to an FPGA for High-Performance Computing type: book_chapter user_id: '15278' year: '2021' ... --- _id: '37547' alternative_title: - Journal der Schreibwissenschaft 22 (3), S. 52-63 author: - first_name: Stefanie full_name: Vochatzer, Stefanie id: '95153' last_name: Vochatzer - first_name: 'Sebastian ' full_name: 'Engelmann , Sebastian ' last_name: 'Engelmann ' citation: ama: Vochatzer S, Engelmann S. Autoethnografie und Kreatives Schreiben. Journal der Schreibwissenschaft. 2021;3(22):52-63. doi:10.3278/JOS2102W052 apa: Vochatzer, S., & Engelmann , S. (2021). Autoethnografie und Kreatives Schreiben. Journal der Schreibwissenschaft, 3(22), 52–63. https://doi.org/10.3278/JOS2102W052 bibtex: '@article{Vochatzer_Engelmann _2021, title={ Autoethnografie und Kreatives Schreiben}, volume={3}, DOI={10.3278/JOS2102W052}, number={22}, journal={Journal der Schreibwissenschaft}, publisher={WBV}, author={Vochatzer, Stefanie and Engelmann , Sebastian }, year={2021}, pages={52–63} }' chicago: 'Vochatzer, Stefanie, and Sebastian Engelmann . “ Autoethnografie und Kreatives Schreiben.” Journal der Schreibwissenschaft 3, no. 22 (2021): 52–63. https://doi.org/10.3278/JOS2102W052.' ieee: 'S. Vochatzer and S. Engelmann , “ Autoethnografie und Kreatives Schreiben,” Journal der Schreibwissenschaft, vol. 3, no. 22, pp. 52–63, 2021, doi: 10.3278/JOS2102W052.' mla: Vochatzer, Stefanie, and Sebastian Engelmann . “ Autoethnografie und Kreatives Schreiben.” Journal der Schreibwissenschaft, vol. 3, no. 22, WBV, 2021, pp. 52–63, doi:10.3278/JOS2102W052. short: S. Vochatzer, S. Engelmann , Journal der Schreibwissenschaft 3 (2021) 52–63. date_created: 2023-01-19T10:28:15Z date_updated: 2025-05-25T12:51:43Z department: - _id: '723' - _id: '724' - _id: '36' doi: 10.3278/JOS2102W052 intvolume: ' 3' issue: '22' language: - iso: ger page: 52-63 publication: Journal der Schreibwissenschaft publication_status: published publisher: WBV status: public title: ' Autoethnografie und Kreatives Schreiben' type: journal_article user_id: '95153' volume: 3 year: '2021' ... --- _id: '51202' abstract: - lang: eng text: When joining lightweight parts of various materials, clinching is a cost efficient solution. In a production line, the quality of a clinch point is primarily controlled by measurement of dimensions, which are accessible from outside. However, methods such as visual testing and measuring the bottom thickness as well as the outer diameter are not able to deliver any information about the most significant geometrical characteristic of the clinch point, neck thickness and undercut. Furthermore, ex-situ destructive methods such as microsectioning cannot detect elastic deformations and cracks that close after unloading. In order to exceed the current limits, a new non-destructive in-situ testing method for the clinching process is necessary. This work proposes a concept to characterize clinch points in-situ by combining two complementary non-destructive methods, namely, computed tomography (CT) and ultrasonic testing. Firstly, clinch points with different geometrical characteristics are analysed experimentally using ex-situ CT to get a highly spatially resolved 3D-image of the object. In this context, highly X-ray attenuating materials enhancing the visibility of the sheet-sheet interface are investigated. Secondly, the test specimens are modelled using finite element method (FEM) and a transient dynamic analysis (TDA) is conducted to study the effect of the geometrical differences on the deformation energy and to qualify the TDA as a fast in-situ non-destructive method for characterizing clinch points at high temporal resolution. author: - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Behdad full_name: Sadeghian, Behdad last_name: Sadeghian - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Maik full_name: Gude, Maik last_name: Gude - first_name: Alexander full_name: Brosius, Alexander last_name: Brosius citation: ama: Köhler D, Sadeghian B, Kupfer R, Troschitz J, Gude M, Brosius A. A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis. Key Engineering Materials. 2021;883:89-96. doi:10.4028/www.scientific.net/kem.883.89 apa: Köhler, D., Sadeghian, B., Kupfer, R., Troschitz, J., Gude, M., & Brosius, A. (2021). A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis. Key Engineering Materials, 883, 89–96. https://doi.org/10.4028/www.scientific.net/kem.883.89 bibtex: '@article{Köhler_Sadeghian_Kupfer_Troschitz_Gude_Brosius_2021, title={A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.89}, journal={Key Engineering Materials}, publisher={Trans Tech Publications, Ltd.}, author={Köhler, Daniel and Sadeghian, Behdad and Kupfer, Robert and Troschitz, Juliane and Gude, Maik and Brosius, Alexander}, year={2021}, pages={89–96} }' chicago: 'Köhler, Daniel, Behdad Sadeghian, Robert Kupfer, Juliane Troschitz, Maik Gude, and Alexander Brosius. “A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Key Engineering Materials 883 (2021): 89–96. https://doi.org/10.4028/www.scientific.net/kem.883.89.' ieee: 'D. Köhler, B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, and A. Brosius, “A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis,” Key Engineering Materials, vol. 883, pp. 89–96, 2021, doi: 10.4028/www.scientific.net/kem.883.89.' mla: Köhler, Daniel, et al. “A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis.” Key Engineering Materials, vol. 883, Trans Tech Publications, Ltd., 2021, pp. 89–96, doi:10.4028/www.scientific.net/kem.883.89. short: D. Köhler, B. Sadeghian, R. Kupfer, J. Troschitz, M. Gude, A. Brosius, Key Engineering Materials 883 (2021) 89–96. date_created: 2024-02-06T15:06:14Z date_updated: 2025-06-02T20:19:57Z department: - _id: '157' - _id: '43' doi: 10.4028/www.scientific.net/kem.883.89 intvolume: ' 883' keyword: - Mechanical Engineering - Mechanics of Materials - General Materials Science language: - iso: eng page: 89-96 project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' publication: Key Engineering Materials publication_identifier: issn: - 1662-9795 publication_status: published publisher: Trans Tech Publications, Ltd. status: public title: A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis type: journal_article user_id: '83408' volume: 883 year: '2021' ... --- _id: '51199' abstract: - lang: eng text: AbstractRecent developments in automotive and aircraft industry towards a multi-material design pose challenges for modern joining technologies due to different mechanical properties and material compositions of various materials such as composites and metals. Therefore, mechanical joining technologies like clinching are in the focus of current research activities. For multi-material joints of metals and thermoplastic composites thermally assisted clinching processes with advanced tool concepts are well developed. The material-specific properties of fibre-reinforced thermoplastics have a significant influence on the joining process and the resulting material structure in the joining zone. For this reason, it is important to investigate these influences in detail and to understand the phenomena occurring during the joining process. Additionally, this provides the basis for a validation of a numerical simulation of such joining processes. In this paper, the material structure in a joint resulting from a thermally assisted clinching process is investigated. The joining partners are an aluminium sheet and a thermoplastic composite (organo sheet). Using computed tomography enables a three-dimensional investigation that allows a detailed analysis of the phenomena in different joining stages and in the material structure of the finished joint. Consequently, this study provides a more detailed understanding of the material behavior of thermoplastic composites during thermally assisted clinching. author: - first_name: Benjamin full_name: Gröger, Benjamin last_name: Gröger - first_name: Daniel full_name: Köhler, Daniel last_name: Köhler - first_name: Julian full_name: Vorderbrüggen, Julian last_name: Vorderbrüggen - first_name: Juliane full_name: Troschitz, Juliane last_name: Troschitz - first_name: Robert full_name: Kupfer, Robert last_name: Kupfer - first_name: Gerson full_name: Meschut, Gerson last_name: Meschut - first_name: Maik full_name: Gude, Maik last_name: Gude citation: ama: Gröger B, Köhler D, Vorderbrüggen J, et al. Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets. Production Engineering. 2021;16(2-3):203-212. doi:10.1007/s11740-021-01091-x apa: Gröger, B., Köhler, D., Vorderbrüggen, J., Troschitz, J., Kupfer, R., Meschut, G., & Gude, M. (2021). Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets. Production Engineering, 16(2–3), 203–212. https://doi.org/10.1007/s11740-021-01091-x bibtex: '@article{Gröger_Köhler_Vorderbrüggen_Troschitz_Kupfer_Meschut_Gude_2021, title={Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets}, volume={16}, DOI={10.1007/s11740-021-01091-x}, number={2–3}, journal={Production Engineering}, publisher={Springer Science and Business Media LLC}, author={Gröger, Benjamin and Köhler, Daniel and Vorderbrüggen, Julian and Troschitz, Juliane and Kupfer, Robert and Meschut, Gerson and Gude, Maik}, year={2021}, pages={203–212} }' chicago: 'Gröger, Benjamin, Daniel Köhler, Julian Vorderbrüggen, Juliane Troschitz, Robert Kupfer, Gerson Meschut, and Maik Gude. “Computed Tomography Investigation of the Material Structure in Clinch Joints in Aluminium Fibre-Reinforced Thermoplastic Sheets.” Production Engineering 16, no. 2–3 (2021): 203–12. https://doi.org/10.1007/s11740-021-01091-x.' ieee: 'B. Gröger et al., “Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets,” Production Engineering, vol. 16, no. 2–3, pp. 203–212, 2021, doi: 10.1007/s11740-021-01091-x.' mla: Gröger, Benjamin, et al. “Computed Tomography Investigation of the Material Structure in Clinch Joints in Aluminium Fibre-Reinforced Thermoplastic Sheets.” Production Engineering, vol. 16, no. 2–3, Springer Science and Business Media LLC, 2021, pp. 203–12, doi:10.1007/s11740-021-01091-x. short: B. Gröger, D. Köhler, J. Vorderbrüggen, J. Troschitz, R. Kupfer, G. Meschut, M. Gude, Production Engineering 16 (2021) 203–212. date_created: 2024-02-06T15:05:29Z date_updated: 2025-06-02T20:20:49Z department: - _id: '157' - _id: '43' doi: 10.1007/s11740-021-01091-x intvolume: ' 16' issue: 2-3 keyword: - Industrial and Manufacturing Engineering - Mechanical Engineering language: - iso: eng page: 203-212 project: - _id: '130' grant_number: '418701707' name: 'TRR 285: TRR 285' - _id: '133' name: 'TRR 285 - C: TRR 285 - Project Area C' - _id: '148' name: 'TRR 285 – C04: TRR 285 - Subproject C04' - _id: '131' name: 'TRR 285 - A: TRR 285 - Project Area A' - _id: '137' name: 'TRR 285 – A03: TRR 285 - Subproject A03' publication: Production Engineering publication_identifier: issn: - 0944-6524 - 1863-7353 publication_status: published publisher: Springer Science and Business Media LLC status: public title: Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets type: journal_article user_id: '83408' volume: 16 year: '2021' ... --- _id: '23431' abstract: - lang: eng text: As an effective and accurate method for modelling composite materials, mean-field homogenization is still not well studied in modelling non-linear and damage behaviours of UD composites. Investigated micro FE-simulations show that the matrix of UD composites exhibits different average plastic behaviour, named as average asymmetric matrix plasticity (AAMP), when the composite behaves different under shear, longitudinal and transverse loadings. In this study, a non-linear mean-field debonding model (NMFDM) combining a mean-field model and a fibre–matrix interface debonding model, is developed to simulate UD composites under consideration of AAMP, fibre–matrix interface damage and progressive failure. AAMP is considered by using so-called stress mode factor, which is expressed in terms of basic invariants of the matrix deviatoric stress tensor and is used as an indicator for detection of differences in the loading mode. The material behaviour of UD composites with imperfect interface is assumed identical as for perfect interface and stiffness reduced fibres. Progressive failure criteria are established with consideration of fibre breakage and matrix crack for different fibre orientations. As a representative example for the NMFDM, a C30/E201 UD composite is studied. To verify the model, experiments are conducted on polymers, carbon fibres and UD CFRPs. Finally, the model is applied to simulate a perforated CFRP laminate, which shows excellent prediction ability on deformation, debonding and progressive failure. article_number: '109209' author: - first_name: C. full_name: Cheng, C. last_name: Cheng - first_name: Z. full_name: Wang, Z. last_name: Wang - first_name: Z. full_name: Jin, Z. last_name: Jin - first_name: X. full_name: Ju, X. last_name: Ju - first_name: Swetlana full_name: Schweizer, Swetlana id: '8938' last_name: Schweizer - first_name: Thomas full_name: Tröster, Thomas id: '553' last_name: Tröster - first_name: Rolf full_name: Mahnken, Rolf id: '335' last_name: Mahnken citation: ama: 'Cheng C, Wang Z, Jin Z, et al. Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure. Composites Part B: Engineering. 2021;224. doi:10.1016/j.compositesb.2021.109209' apa: 'Cheng, C., Wang, Z., Jin, Z., Ju, X., Schweizer, S., Tröster, T., & Mahnken, R. (2021). Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure. Composites Part B: Engineering, 224, Article 109209. https://doi.org/10.1016/j.compositesb.2021.109209' bibtex: '@article{Cheng_Wang_Jin_Ju_Schweizer_Tröster_Mahnken_2021, title={Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure}, volume={224}, DOI={10.1016/j.compositesb.2021.109209}, number={109209}, journal={Composites Part B: Engineering}, author={Cheng, C. and Wang, Z. and Jin, Z. and Ju, X. and Schweizer, Swetlana and Tröster, Thomas and Mahnken, Rolf}, year={2021} }' chicago: 'Cheng, C., Z. Wang, Z. Jin, X. Ju, Swetlana Schweizer, Thomas Tröster, and Rolf Mahnken. “Non-Linear Mean-Field Modelling of UD Composite Laminates Accounting for Average Asymmetric Plasticity of the Matrix, Debonding and Progressive Failure.” Composites Part B: Engineering 224 (2021). https://doi.org/10.1016/j.compositesb.2021.109209.' ieee: 'C. Cheng et al., “Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure,” Composites Part B: Engineering, vol. 224, Art. no. 109209, 2021, doi: 10.1016/j.compositesb.2021.109209.' mla: 'Cheng, C., et al. “Non-Linear Mean-Field Modelling of UD Composite Laminates Accounting for Average Asymmetric Plasticity of the Matrix, Debonding and Progressive Failure.” Composites Part B: Engineering, vol. 224, 109209, 2021, doi:10.1016/j.compositesb.2021.109209.' short: 'C. Cheng, Z. Wang, Z. Jin, X. Ju, S. Schweizer, T. Tröster, R. Mahnken, Composites Part B: Engineering 224 (2021).' date_created: 2021-08-18T06:20:21Z date_updated: 2025-06-06T08:08:32Z department: - _id: '9' - _id: '154' - _id: '321' - _id: '149' doi: 10.1016/j.compositesb.2021.109209 intvolume: ' 224' keyword: - Non-linear mean-field homogenization Average asymmetric plasticity of matrix Fibre–matrix interface debonding Micro-mechanical FE-simulation Progressive failure language: - iso: eng publication: 'Composites Part B: Engineering' publication_identifier: issn: - 1359-8368 publication_status: published quality_controlled: '1' status: public title: Non-linear mean-field modelling of UD composite laminates accounting for average asymmetric plasticity of the matrix, debonding and progressive failure type: journal_article user_id: '15952' volume: 224 year: '2021' ... --- _id: '24159' abstract: - lang: eng text: "The online fitting of a microscopic traffic simulation model to reconstruct the current state of a real traffic\r\narea can be challenging depending on the provided data. This paper presents a novel method based on limited\r\ndata from sensors positioned at specific locations and guarantees a general accordance of reality and\r\nsimulation in terms of multimodal road traffic counts and vehicle speeds. In these considerations, the actual\r\npurpose of research is of particular importance. Here, the research aims at improving the traffic flow by\r\ncontrolling the Traffic Light Systems (TLS) of the examined area which is why the current traffic state and\r\nthe route choices of individual road users are the matter of interest. An integer optimization problem is derived\r\nto fit the current simulation to the latest field measurements. The concept can be transferred to any road traffic\r\nnetwork and results in an observation of the current multimodal traffic state matching at the given sensor\r\nposition. First case studies show promosing results in terms of deviations between reality and simulation." author: - first_name: Kevin full_name: Malena, Kevin id: '36303' last_name: Malena orcid: 0000-0003-1183-4679 - first_name: Christopher full_name: Link, Christopher id: '38249' last_name: Link - first_name: Sven full_name: Mertin, Sven id: '13195' last_name: Mertin - first_name: Sandra full_name: Gausemeier, Sandra id: '17793' last_name: Gausemeier - first_name: Ansgar full_name: Trächtler, Ansgar id: '552' last_name: Trächtler citation: ama: 'Malena K, Link C, Mertin S, Gausemeier S, Trächtler A. Online State Estimation for Microscopic Traffic Simulations using Multiple Data Sources*. In: VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems. Vol 7. VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems. SCITEPRESS; 2021:386-395.' apa: Malena, K., Link, C., Mertin, S., Gausemeier, S., & Trächtler, A. (2021). Online State Estimation for Microscopic Traffic Simulations using Multiple Data Sources*. VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems, 7, 386–395. bibtex: '@inproceedings{Malena_Link_Mertin_Gausemeier_Trächtler_2021, place={Portugal}, series={VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems}, title={Online State Estimation for Microscopic Traffic Simulations using Multiple Data Sources*}, volume={7}, booktitle={VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems}, publisher={SCITEPRESS}, author={Malena, Kevin and Link, Christopher and Mertin, Sven and Gausemeier, Sandra and Trächtler, Ansgar}, year={2021}, pages={386–395}, collection={VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems} }' chicago: 'Malena, Kevin, Christopher Link, Sven Mertin, Sandra Gausemeier, and Ansgar Trächtler. “Online State Estimation for Microscopic Traffic Simulations Using Multiple Data Sources*.” In VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems, 7:386–95. VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems. Portugal: SCITEPRESS, 2021.' ieee: K. Malena, C. Link, S. Mertin, S. Gausemeier, and A. Trächtler, “Online State Estimation for Microscopic Traffic Simulations using Multiple Data Sources*,” in VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems, Online Streaming, 2021, vol. 7, pp. 386–395. mla: Malena, Kevin, et al. “Online State Estimation for Microscopic Traffic Simulations Using Multiple Data Sources*.” VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems, vol. 7, SCITEPRESS, 2021, pp. 386–95. short: 'K. Malena, C. Link, S. Mertin, S. Gausemeier, A. Trächtler, in: VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems, SCITEPRESS, Portugal, 2021, pp. 386–395.' conference: end_date: 2021-04-30 location: Online Streaming name: 7th International Conference on Vehicle Technology and Intelligent Transport Systems start_date: 2021-04-28 date_created: 2021-09-10T12:19:14Z date_updated: 2026-01-26T08:49:53Z department: - _id: '153' intvolume: ' 7' keyword: - Microscopic Traffic Simulation - Online State Estimation - Mixed Road Users - Sensor Fusion - Integer Programming - Route Choice - Vehicle2Infrastructure language: - iso: eng main_file_link: - url: https://www.scitepress.org/PublicationsDetail.aspx?ID=3xZWfOSENWk=&t=1 page: 386-395 place: Portugal project: - _id: '688' name: Pilotprojekt "Schlosskreuzung" publication: VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems publication_identifier: isbn: - 978-989-758-513-5 publication_status: published publisher: SCITEPRESS quality_controlled: '1' related_material: link: - relation: confirmation url: https://www.scitepress.org/PublicationsDetail.aspx?ID=3xZWfOSENWk=&t=1 record: - id: '33849' relation: is_continued_by status: public series_title: VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems status: public title: Online State Estimation for Microscopic Traffic Simulations using Multiple Data Sources* type: conference user_id: '36303' volume: 7 year: '2021' ... --- _id: '24166' abstract: - lang: eng text: This paper deals with a novel method for the online fitting of a microscopic traffic simulation model to the current state of a real world traffic area. The traffic state estimation is based on limited data of different measurement sources and guarantees general accordance of reality and simulation in terms of multimodal road traffic counts and vehicle speeds. The research is embedded in the challenge of improving the traffic by controlling the traffic light systems (TLS) of the examined area. Therefore, the current traffic state and the predicted route choices of individual road users are the matter of interest. The concept is generally transferable to any road traffic system. To give an impression of the accuracy and potential of the approach, the validation and first application results are presented. author: - first_name: Kevin full_name: Malena, Kevin id: '36303' last_name: Malena orcid: 0000-0003-1183-4679 - first_name: Christopher full_name: Link, Christopher id: '38249' last_name: Link - first_name: Sven full_name: Mertin, Sven id: '13195' last_name: Mertin - first_name: Sandra full_name: Gausemeier, Sandra id: '17793' last_name: Gausemeier - first_name: Ansgar full_name: Trächtler, Ansgar id: '552' last_name: Trächtler citation: ama: 'Malena K, Link C, Mertin S, Gausemeier S, Trächtler A. Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆. In: 2021 IEEE Transportation Electrification Conference & Expo (ITEC). IEEE; 2021. doi:10.1109/itec51675.2021.9490087' apa: Malena, K., Link, C., Mertin, S., Gausemeier, S., & Trächtler, A. (2021). Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆. 2021 IEEE Transportation Electrification Conference & Expo (ITEC). 2021 IEEE Transportation Electrification Conference & Expo (ITEC). https://doi.org/10.1109/itec51675.2021.9490087 bibtex: '@inproceedings{Malena_Link_Mertin_Gausemeier_Trächtler_2021, place={Chicago, IL, USA }, title={Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆}, DOI={10.1109/itec51675.2021.9490087}, booktitle={2021 IEEE Transportation Electrification Conference & Expo (ITEC)}, publisher={IEEE}, author={Malena, Kevin and Link, Christopher and Mertin, Sven and Gausemeier, Sandra and Trächtler, Ansgar}, year={2021} }' chicago: 'Malena, Kevin, Christopher Link, Sven Mertin, Sandra Gausemeier, and Ansgar Trächtler. “Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆.” In 2021 IEEE Transportation Electrification Conference & Expo (ITEC). Chicago, IL, USA : IEEE, 2021. https://doi.org/10.1109/itec51675.2021.9490087.' ieee: 'K. Malena, C. Link, S. Mertin, S. Gausemeier, and A. Trächtler, “Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆,” presented at the 2021 IEEE Transportation Electrification Conference & Expo (ITEC), 2021, doi: 10.1109/itec51675.2021.9490087.' mla: Malena, Kevin, et al. “Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆.” 2021 IEEE Transportation Electrification Conference & Expo (ITEC), IEEE, 2021, doi:10.1109/itec51675.2021.9490087. short: 'K. Malena, C. Link, S. Mertin, S. Gausemeier, A. Trächtler, in: 2021 IEEE Transportation Electrification Conference & Expo (ITEC), IEEE, Chicago, IL, USA , 2021.' conference: end_date: 2021-05-25 name: 2021 IEEE Transportation Electrification Conference & Expo (ITEC) start_date: 2021-05-21 date_created: 2021-09-10T12:45:25Z date_updated: 2026-01-26T08:50:10Z department: - _id: '153' doi: 10.1109/itec51675.2021.9490087 language: - iso: eng main_file_link: - open_access: '1' url: https://ieeexplore.ieee.org/document/9490087 oa: '1' place: 'Chicago, IL, USA ' project: - _id: '688' name: Pilotprojekt "Schlosskreuzung" publication: 2021 IEEE Transportation Electrification Conference & Expo (ITEC) publication_identifier: isbn: - 978-1-7281-7584-3 publication_status: published publisher: IEEE related_material: link: - relation: confirmation url: https://ieeexplore.ieee.org/document/9490087 status: public title: Validation of an Online State Estimation Concept for Microscopic Traffic Simulations◆ type: conference user_id: '36303' year: '2021' ... --- _id: '22272' abstract: - lang: eng text: The number of multi-material joints is increasing as a result of lightweight design. Self-piercing riveting (SPR) is an important mechanical joining technique for multi-material structures. Rivets for SPR are coated to prevent corrosion, but this coating also influences the friction that prevails during the joining process. The aim of the present investigation is to evaluate this influence. The investigation focuses on the common rivet coatings Almac® and zinc-nickel with topcoat as well as on uncoated rivet surfaces. First of all, the coating thickness and the uniformity of the coating distribution are analysed. Friction tests facilitate the classification of the surface properties. The influence of the friction on the characteristic joint parameters and the force-stroke curves is analysed by means of experimental joining tests. More in-depth knowledge of the effects that occur is achieved through the use of numerical simulation. Overall, it is shown that the surface condition of the rivet has an impact on the friction during the joining process and on the resulting joint. However, the detected deviations between different surface conditions do not restrict the operational capability of SPR and the properties of uncoated rivet surfaces, in particular, are similar to those of Almac®-coated rivets. It can thus be assumed that SPR with respect to the joining process is also possible without rivet coating in principle. author: - first_name: Benedikt full_name: Uhe, Benedikt id: '38131' last_name: Uhe - first_name: Clara-Maria full_name: Kuball, Clara-Maria last_name: Kuball - first_name: Marion full_name: Merklein, Marion last_name: Merklein - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: Uhe B, Kuball C-M, Merklein M, Meschut G. Influence of the Rivet Coating on the Friction during Self-Piercing Riveting. Key Engineering Materials. 2021;883:11-18. doi:10.4028/www.scientific.net/KEM.883.11 apa: Uhe, B., Kuball, C.-M., Merklein, M., & Meschut, G. (2021). Influence of the Rivet Coating on the Friction during Self-Piercing Riveting. Key Engineering Materials, 883, 11–18. https://doi.org/10.4028/www.scientific.net/KEM.883.11 bibtex: '@article{Uhe_Kuball_Merklein_Meschut_2021, title={Influence of the Rivet Coating on the Friction during Self-Piercing Riveting}, volume={883}, DOI={10.4028/www.scientific.net/KEM.883.11}, journal={Key Engineering Materials}, author={Uhe, Benedikt and Kuball, Clara-Maria and Merklein, Marion and Meschut, Gerson}, year={2021}, pages={11–18} }' chicago: 'Uhe, Benedikt, Clara-Maria Kuball, Marion Merklein, and Gerson Meschut. “Influence of the Rivet Coating on the Friction during Self-Piercing Riveting.” Key Engineering Materials 883 (2021): 11–18. https://doi.org/10.4028/www.scientific.net/KEM.883.11.' ieee: 'B. Uhe, C.-M. Kuball, M. Merklein, and G. Meschut, “Influence of the Rivet Coating on the Friction during Self-Piercing Riveting,” Key Engineering Materials, vol. 883, pp. 11–18, 2021, doi: 10.4028/www.scientific.net/KEM.883.11.' mla: Uhe, Benedikt, et al. “Influence of the Rivet Coating on the Friction during Self-Piercing Riveting.” Key Engineering Materials, vol. 883, 2021, pp. 11–18, doi:10.4028/www.scientific.net/KEM.883.11. short: B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, Key Engineering Materials 883 (2021) 11–18. date_created: 2021-05-31T10:06:11Z date_updated: 2026-02-27T10:23:33Z department: - _id: '157' doi: 10.4028/www.scientific.net/KEM.883.11 intvolume: ' 883' keyword: - Coating - Friction - Joining language: - iso: eng page: 11-18 publication: Key Engineering Materials quality_controlled: '1' status: public title: Influence of the Rivet Coating on the Friction during Self-Piercing Riveting type: journal_article user_id: '53912' volume: 883 year: '2021' ... --- _id: '6563' abstract: - lang: ger text: Designprozesse von Schallwandlern werden durch zunehmende Rechenkapazitäten immer mehr durch simulative Betrachtungen unterstützt. Dabei ist vor allem die Wahl der Materialparameter der verwendeten Materialien wichtig für ein realitätsnahes Simulationsergebnis. Bei Schallwandlern werden häufig Piezokeramiken als aktive Elemente genutzt, welche sich durch eine Verkopplung mechanischer und elektrischer Eigenschaften auszeichnen. Zur Bestimmung ihrer Materialparameter stellt der IEEE Standard on Piezoelectricity ein standardisiertes Verfahren dar. Dazu sind fünf Impedanzmessungen an vier unterschiedlich gefertigten Probekörpergeometrien notwendig. Da an jedem einzelnen Probekörper nur eine Untermenge aller notwendigen Materialparameter bestimmt werden kann, werden diese dann zu einem kompletten Materialparametersatz zusammengefügt. Aufgrund der unterschiedlichen Prozessbedingungen, bei denen die jeweiligen Probekörper hergestellt werden, ist dieser Materialparametersatz jedoch inkonsistent und kann nie das Verhalten einer einzelnen Probe beschreiben. Daher wird in der vorliegenden Arbeit ein Messverfahren entwickelt, mit dem es möglich ist, alle relevanten Materialparameter unter besonderer Berücksichtigung von Dämpfung an einem einzelnen Probekörper allein durch Impedanzmessungen zu bestimmen. Als Probekörper wird dazu eine in der Anwendung häufig verwendete Scheibengeometrie verwendet. Um eine hinreichend hohe Sensitivität auf alle Materialparameter zu gewährleisten, wird diese mit einer optimierten Elektrodentopologie gefertigt. Da in diesem Fall keine analytische Betrachtung mehr möglich ist, wird das Messverfahren durch einen inversen Ansatz realisiert. - lang: eng text: Design processes of ultrasonic transducers become increasingly simulation-driven due to rising computational capabilities. Therewithin, the choice of the material parameters for modelling the materials used is particularly important for a realistic simulation result. Piezoceramics, which couple mechanic and electrical properties, are often used as active elements in ultrasonic transducers.The IEEE Standard on Piezoelectricity is a standardised procedure for determining these parameters that requires five impedance measurements on four piezocermics of different geometry. Since only a subset of all necessary material parameters can be determined for each individual specimen, these are then combined to form a complete set of material parameters. Due to different processing conditions for each specimen, this set of material parameters is inconsistent and cannot describe the behaviour of a single specimen appropriately. Therefore, in the present thesis, a method is developed with enables the determination of all relevant material parameters including damping on a single piezocermic by means of electrical impedance measurements alone. A piezoelectric ceramic with disc-shaped geometry, which is frequently used in applications, is used as a specimen.In order to ensure a sufficiently high sensitivity to all material parameters, it is manufactured with an optimised electrode topology. Because in this case analytical solutions, which relate the measurement quantities to the material parameters, do not exist, the measurement method is implemented using an inverse approach. author: - first_name: Nadine full_name: Feldmann, Nadine id: '23082' last_name: Feldmann citation: ama: Feldmann N.   Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers. Universität Paderborn; 2021. doi:10.17619/UNIPB/1-1264 apa: Feldmann, N. (2021).   Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers. Universität Paderborn. https://doi.org/10.17619/UNIPB/1-1264 bibtex: '@book{Feldmann_2021, title={  Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers}, DOI={10.17619/UNIPB/1-1264}, publisher={Universität Paderborn}, author={Feldmann, Nadine}, year={2021} }' chicago: Feldmann, Nadine.   Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers. Universität Paderborn, 2021. https://doi.org/10.17619/UNIPB/1-1264. ieee: N. Feldmann,   Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers. Universität Paderborn, 2021. mla: Feldmann, Nadine.   Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers. Universität Paderborn, 2021, doi:10.17619/UNIPB/1-1264. short: N. Feldmann,   Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers, Universität Paderborn, 2021. date_created: 2019-01-09T14:37:11Z date_updated: 2026-01-05T07:55:46Z department: - _id: '49' doi: 10.17619/UNIPB/1-1264 language: - iso: ger main_file_link: - open_access: '1' url: https://digital.ub.uni-paderborn.de/urn/urn:nbn:de:hbz:466:2-40232 oa: '1' page: '184' project: - _id: '90' name: 'ChaMP: Ein modellbasiertes Messverfahren zur Charakterisierung der frequenzabhängigen Materialeigenschaften von Piezokeramiken unter Verwendung eines einzelnen Probekörperindividuums' - _id: '245' name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)' publisher: Universität Paderborn status: public supervisor: - first_name: Bernd full_name: Henning, Bernd id: '213' last_name: Henning - first_name: Andrea full_name: Walther, Andrea last_name: Walther title: "\t Ein modellbasiertes Messverfahren zur Charakterisierung von Piezokeramiken unter Verwendung eines einzelnen scheibenförmigen Probekörpers" type: dissertation user_id: '11829' year: '2021' ... --- _id: '21341' abstract: - lang: eng text: The progress in numerical methods and simulation tools promotes the use of inverse problems in material characterisation problems. A newly developed procedure can be used to identify the behaviour of piezoceramic discs over a wide frequency range using a single specimen via fitting simulated and measured impedances by optimising the underlying material parameters. Since there is no generally accepted damping model for piezoelectric ceramics, several mechanical damping models are examined for the material identification. Three models have been chosen and their ability to replicate the measured impedances is evaluated. On the one hand, the common Rayleigh model is considered as a reference. On the other hand, a Zener model and a model using complex constants are extended to model the transversely isotropic material. As the Rayleigh model is only valid for a limited frequency range, it fails to model the broadband behaviour of the material. The model using complex constants leads to the best fit over a wide frequency range while at the same time only adding three additional parameters for modelling damping. Thus, damping can be assumed approximately frequency-independent in piezoceramics. author: - first_name: Nadine full_name: Feldmann, Nadine id: '23082' last_name: Feldmann - first_name: Veronika full_name: Schulze, Veronika last_name: Schulze - first_name: Leander full_name: Claes, Leander id: '11829' last_name: Claes orcid: 0000-0002-4393-268X - first_name: Benjamin full_name: Jurgelucks, Benjamin last_name: Jurgelucks - first_name: Lars full_name: Meihost, Lars id: '24769' last_name: Meihost - first_name: Andrea full_name: Walther, Andrea last_name: Walther - first_name: Bernd full_name: Henning, Bernd id: '213' last_name: Henning citation: ama: 'Feldmann N, Schulze V, Claes L, et al. Modelling damping in piezoceramics: A comparative study. tm - Technisches Messen. 2021;88(5):294-302. doi:10.1515/teme-2020-0096' apa: 'Feldmann, N., Schulze, V., Claes, L., Jurgelucks, B., Meihost, L., Walther, A., & Henning, B. (2021). Modelling damping in piezoceramics: A comparative study. Tm - Technisches Messen, 88(5), 294–302. https://doi.org/10.1515/teme-2020-0096' bibtex: '@article{Feldmann_Schulze_Claes_Jurgelucks_Meihost_Walther_Henning_2021, title={Modelling damping in piezoceramics: A comparative study}, volume={88}, DOI={10.1515/teme-2020-0096}, number={5}, journal={tm - Technisches Messen}, author={Feldmann, Nadine and Schulze, Veronika and Claes, Leander and Jurgelucks, Benjamin and Meihost, Lars and Walther, Andrea and Henning, Bernd}, year={2021}, pages={294–302} }' chicago: 'Feldmann, Nadine, Veronika Schulze, Leander Claes, Benjamin Jurgelucks, Lars Meihost, Andrea Walther, and Bernd Henning. “Modelling Damping in Piezoceramics: A Comparative Study.” Tm - Technisches Messen 88, no. 5 (2021): 294–302. https://doi.org/10.1515/teme-2020-0096.' ieee: 'N. Feldmann et al., “Modelling damping in piezoceramics: A comparative study,” tm - Technisches Messen, vol. 88, no. 5, pp. 294–302, 2021, doi: 10.1515/teme-2020-0096.' mla: 'Feldmann, Nadine, et al. “Modelling Damping in Piezoceramics: A Comparative Study.” Tm - Technisches Messen, vol. 88, no. 5, 2021, pp. 294–302, doi:10.1515/teme-2020-0096.' short: N. Feldmann, V. Schulze, L. Claes, B. Jurgelucks, L. Meihost, A. Walther, B. Henning, Tm - Technisches Messen 88 (2021) 294–302. date_created: 2021-03-01T14:49:51Z date_updated: 2026-01-05T07:54:13Z department: - _id: '49' doi: 10.1515/teme-2020-0096 intvolume: ' 88' issue: '5' language: - iso: eng page: 294 - 302 project: - _id: '90' name: Ein modellbasiertes Messverfahren zur Charakterisierung der frequenzabhängigen Materialeigenschaften von Piezokeramiken unter Verwendung eines einzelnen Probekörperindividuums - _id: '245' name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)' publication: tm - Technisches Messen publication_identifier: issn: - 2196-7113 - 0171-8096 publication_status: published quality_controlled: '1' status: public title: 'Modelling damping in piezoceramics: A comparative study' type: journal_article user_id: '11829' volume: 88 year: '2021' ... --- _id: '25265' abstract: - lang: eng text: "Waveguide-based methods can be used for the non-destructive determination of acoustic material parameters. One of these methods is based on transmission measurements of cylindrical polymeric specimens. Here, the experimental setup consists of two transducers, which excite and receive the waveguide modes at the faces of the cylinder. The measurement, as well as a forward model, are used to determine material parameters of the polymeric specimen in an inverse approach.\r\n1-3 piezoelectric composites are used as an active element because they can be approximated by a thickness vibration only. This allows an easy identification of Mason model parameters to characterise the transducers’ vibration behaviour. \r\nHowever, sensitivity analysis shows a high uncertainty in the determination of the mechanical shear parameters due to the uniform excitation. To increase the sensitivity to these shear motions, arbitrary excitations were investigated by means of numerical simulation. \r\nIn order to be able to realise the determined optimal excitation, new transducer prototypes were designed. By subdividing the electrodes of the active element, for example, ring-shaped excitation is feasible. Furthermore, it can be shown that modelling these transducers with a one-dimensional Mason model is sufficient." author: - first_name: Dmitrij full_name: Dreiling, Dmitrij id: '32616' last_name: Dreiling - first_name: Dominik full_name: Itner, Dominik last_name: Itner - first_name: Nadine full_name: Feldmann, Nadine id: '23082' last_name: Feldmann - first_name: Claus full_name: Scheidemann, Claus id: '38259' last_name: Scheidemann - first_name: Hauke full_name: Gravenkamp, Hauke last_name: Gravenkamp - first_name: Bernd full_name: Henning, Bernd id: '213' last_name: Henning citation: ama: 'Dreiling D, Itner D, Feldmann N, Scheidemann C, Gravenkamp H, Henning B. Application and modelling of ultrasonic transducers using 1-3 piezoelectric composites with structured electrodes. In: Fortschritte Der Akustik - DAGA 2021. Deutsche Gesellschaft für Akustik e.V. (DEGA); 2021.' apa: Dreiling, D., Itner, D., Feldmann, N., Scheidemann, C., Gravenkamp, H., & Henning, B. (2021). Application and modelling of ultrasonic transducers using 1-3 piezoelectric composites with structured electrodes. Fortschritte Der Akustik - DAGA 2021. DAGA 2021 - 47. JAHRESTAGUNG FÜR AKUSTIK, Wien. bibtex: '@inproceedings{Dreiling_Itner_Feldmann_Scheidemann_Gravenkamp_Henning_2021, place={Wien}, title={Application and modelling of ultrasonic transducers using 1-3 piezoelectric composites with structured electrodes}, booktitle={Fortschritte der Akustik - DAGA 2021}, publisher={Deutsche Gesellschaft für Akustik e.V. (DEGA)}, author={Dreiling, Dmitrij and Itner, Dominik and Feldmann, Nadine and Scheidemann, Claus and Gravenkamp, Hauke and Henning, Bernd}, year={2021} }' chicago: 'Dreiling, Dmitrij, Dominik Itner, Nadine Feldmann, Claus Scheidemann, Hauke Gravenkamp, and Bernd Henning. “Application and Modelling of Ultrasonic Transducers Using 1-3 Piezoelectric Composites with Structured Electrodes.” In Fortschritte Der Akustik - DAGA 2021. Wien: Deutsche Gesellschaft für Akustik e.V. (DEGA), 2021.' ieee: D. Dreiling, D. Itner, N. Feldmann, C. Scheidemann, H. Gravenkamp, and B. Henning, “Application and modelling of ultrasonic transducers using 1-3 piezoelectric composites with structured electrodes,” presented at the DAGA 2021 - 47. JAHRESTAGUNG FÜR AKUSTIK, Wien, 2021. mla: Dreiling, Dmitrij, et al. “Application and Modelling of Ultrasonic Transducers Using 1-3 Piezoelectric Composites with Structured Electrodes.” Fortschritte Der Akustik - DAGA 2021, Deutsche Gesellschaft für Akustik e.V. (DEGA), 2021. short: 'D. Dreiling, D. Itner, N. Feldmann, C. Scheidemann, H. Gravenkamp, B. Henning, in: Fortschritte Der Akustik - DAGA 2021, Deutsche Gesellschaft für Akustik e.V. (DEGA), Wien, 2021.' conference: end_date: 2021-08-18 location: Wien name: DAGA 2021 - 47. JAHRESTAGUNG FÜR AKUSTIK start_date: 2021-08-15 date_created: 2021-10-04T07:54:10Z date_updated: 2026-06-02T10:53:51Z ddc: - '620' department: - _id: '49' - _id: '151' has_accepted_license: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://pub.dega-akustik.de/DAGA_2021/data/articles/000138.pdf oa: '1' place: Wien project: - _id: '89' name: Vollständige Bestimmung der akustischen Materialparameter von Polymeren publication: Fortschritte der Akustik - DAGA 2021 publication_status: published publisher: Deutsche Gesellschaft für Akustik e.V. (DEGA) status: public title: Application and modelling of ultrasonic transducers using 1-3 piezoelectric composites with structured electrodes type: conference user_id: '32616' year: '2021' ... --- _id: '19603' abstract: - lang: eng text: "Micro- and smart grids (MSG) play an important role both for integrating\r\nrenewable energy sources in conventional electricity grids and for providing\r\npower supply in remote areas. Modern MSGs are largely driven by power\r\nelectronic converters due to their high efficiency and flexibility.\r\nNevertheless, controlling MSGs is a challenging task due to highest\r\nrequirements on energy availability, safety and voltage quality within a wide\r\nrange of different MSG topologies. This results in a high demand for\r\ncomprehensive testing of new control concepts during their development phase\r\nand comparisons with the state of the art in order to ensure their feasibility.\r\nThis applies in particular to data-driven control approaches from the field of\r\nreinforcement learning (RL), whose stability and operating behavior can hardly\r\nbe evaluated a priori. Therefore, the OpenModelica Microgrid Gym (OMG) package,\r\nan open-source software toolbox for the simulation and control optimization of\r\nMSGs, is proposed. It is capable of modeling and simulating arbitrary MSG\r\ntopologies and offers a Python-based interface for plug \\& play controller\r\ntesting. In particular, the standardized OpenAI Gym interface allows for easy\r\nRL-based controller integration. Besides the presentation of the OMG toolbox,\r\napplication examples are highlighted including safe Bayesian optimization for\r\nlow-level controller tuning." author: - first_name: Henrik full_name: Bode, Henrik last_name: Bode - first_name: Stefan Helmut full_name: Heid, Stefan Helmut id: '39640' last_name: Heid orcid: 0000-0002-9461-7372 - first_name: Daniel full_name: Weber, Daniel last_name: Weber - first_name: Eyke full_name: Hüllermeier, Eyke id: '48129' last_name: Hüllermeier - first_name: Oliver full_name: Wallscheid, Oliver last_name: Wallscheid citation: ama: Bode H, Heid SH, Weber D, Hüllermeier E, Wallscheid O. Towards a Scalable and Flexible Simulation and Testing Environment  Toolbox for Intelligent Microgrid Control. arXiv:200504869. 2020. apa: Bode, H., Heid, S. H., Weber, D., Hüllermeier, E., & Wallscheid, O. (2020). Towards a Scalable and Flexible Simulation and Testing Environment  Toolbox for Intelligent Microgrid Control. ArXiv:2005.04869. bibtex: '@article{Bode_Heid_Weber_Hüllermeier_Wallscheid_2020, title={Towards a Scalable and Flexible Simulation and Testing Environment  Toolbox for Intelligent Microgrid Control}, journal={arXiv:2005.04869}, author={Bode, Henrik and Heid, Stefan Helmut and Weber, Daniel and Hüllermeier, Eyke and Wallscheid, Oliver}, year={2020} }' chicago: Bode, Henrik, Stefan Helmut Heid, Daniel Weber, Eyke Hüllermeier, and Oliver Wallscheid. “Towards a Scalable and Flexible Simulation and Testing Environment  Toolbox for Intelligent Microgrid Control.” ArXiv:2005.04869, 2020. ieee: H. Bode, S. H. Heid, D. Weber, E. Hüllermeier, and O. Wallscheid, “Towards a Scalable and Flexible Simulation and Testing Environment  Toolbox for Intelligent Microgrid Control,” arXiv:2005.04869. 2020. mla: Bode, Henrik, et al. “Towards a Scalable and Flexible Simulation and Testing Environment  Toolbox for Intelligent Microgrid Control.” ArXiv:2005.04869, 2020. short: H. Bode, S.H. Heid, D. Weber, E. Hüllermeier, O. Wallscheid, ArXiv:2005.04869 (2020). date_created: 2020-09-21T10:01:36Z date_updated: 2022-01-06T06:54:07Z language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/pdf/2005.04869.pdf oa: '1' publication: arXiv:2005.04869 status: public title: Towards a Scalable and Flexible Simulation and Testing Environment Toolbox for Intelligent Microgrid Control type: preprint user_id: '39640' year: '2020' ... --- _id: '19606' abstract: - lang: eng text: Mobile shopping apps have been using Augmented Reality (AR) in the last years to place their products in the environment of the customer. While this is possible with atomic 3D objects, there is is still a lack in the runtime configuration of 3D object compositions based on user needs and environmental constraints. For this, we previously developed an approach for model-based AR-assisted product configuration based on the concept of Dynamic Software Product Lines. In this demonstration paper, we present the corresponding tool support ProConAR in the form of a Product Modeler and a Product Configurator. While the Product Modeler is an Angular web app that splits products (e.g. table) up into atomic parts (e.g. tabletop, table legs, funnier) and saves it within a configuration model, the Product Configurator is an Android client that uses the configuration model to place different product configurations within the environment of the customer. We show technical details of our ready to use tool-chain ProConAR by describing its implementation and usage as well as pointing out future research directions. author: - first_name: Sebastian full_name: Gottschalk, Sebastian id: '47208' last_name: Gottschalk - first_name: Enes full_name: Yigitbas, Enes id: '8447' last_name: Yigitbas orcid: 0000-0002-5967-833X - first_name: Eugen full_name: Schmidt, Eugen last_name: Schmidt - first_name: Gregor full_name: Engels, Gregor id: '107' last_name: Engels citation: ama: 'Gottschalk S, Yigitbas E, Schmidt E, Engels G. ProConAR: A Tool Support for Model-based AR Product Configuration. In: Bernhaupt R, Ardito C, Sauer S, eds. Human-Centered Software Engineering. HCSE 2020. Vol 12481. Lecture Notes in Computer Science. Cham: Springer; 2020. doi:10.1007/978-3-030-64266-2_14' apa: 'Gottschalk, S., Yigitbas, E., Schmidt, E., & Engels, G. (2020). ProConAR: A Tool Support for Model-based AR Product Configuration. In R. Bernhaupt, C. Ardito, & S. Sauer (Eds.), Human-Centered Software Engineering. HCSE 2020 (Vol. 12481). Cham: Springer. https://doi.org/10.1007/978-3-030-64266-2_14' bibtex: '@inproceedings{Gottschalk_Yigitbas_Schmidt_Engels_2020, place={Cham}, series={Lecture Notes in Computer Science}, title={ProConAR: A Tool Support for Model-based AR Product Configuration}, volume={12481}, DOI={10.1007/978-3-030-64266-2_14}, booktitle={Human-Centered Software Engineering. HCSE 2020}, publisher={Springer}, author={Gottschalk, Sebastian and Yigitbas, Enes and Schmidt, Eugen and Engels, Gregor}, editor={Bernhaupt, Regina and Ardito, Carmelo and Sauer, StefanEditors}, year={2020}, collection={Lecture Notes in Computer Science} }' chicago: 'Gottschalk, Sebastian, Enes Yigitbas, Eugen Schmidt, and Gregor Engels. “ProConAR: A Tool Support for Model-Based AR Product Configuration.” In Human-Centered Software Engineering. HCSE 2020, edited by Regina Bernhaupt, Carmelo Ardito, and Stefan Sauer, Vol. 12481. Lecture Notes in Computer Science. Cham: Springer, 2020. https://doi.org/10.1007/978-3-030-64266-2_14.' ieee: 'S. Gottschalk, E. Yigitbas, E. Schmidt, and G. Engels, “ProConAR: A Tool Support for Model-based AR Product Configuration,” in Human-Centered Software Engineering. HCSE 2020, Eindhoven, 2020, vol. 12481.' mla: 'Gottschalk, Sebastian, et al. “ProConAR: A Tool Support for Model-Based AR Product Configuration.” Human-Centered Software Engineering. HCSE 2020, edited by Regina Bernhaupt et al., vol. 12481, Springer, 2020, doi:10.1007/978-3-030-64266-2_14.' short: 'S. Gottschalk, E. Yigitbas, E. Schmidt, G. Engels, in: R. Bernhaupt, C. Ardito, S. Sauer (Eds.), Human-Centered Software Engineering. HCSE 2020, Springer, Cham, 2020.' conference: end_date: 2020-12-02 location: Eindhoven name: 8th International Working Conference on Human-Centered Software Engineering (HCSE'20) start_date: 2020-11-30 date_created: 2020-09-21T17:01:11Z date_updated: 2022-01-06T06:54:07Z ddc: - '000' department: - _id: '66' - _id: '534' doi: 10.1007/978-3-030-64266-2_14 editor: - first_name: Regina full_name: Bernhaupt, Regina last_name: Bernhaupt - first_name: Carmelo full_name: Ardito, Carmelo last_name: Ardito - first_name: Stefan full_name: Sauer, Stefan last_name: Sauer file: - access_level: open_access content_type: application/pdf creator: sego date_created: 2020-11-30T08:39:18Z date_updated: 2020-11-30T08:39:18Z file_id: '20542' file_name: HCSE20_demo.pdf file_size: 3913885 relation: main_file file_date_updated: 2020-11-30T08:39:18Z has_accepted_license: '1' intvolume: ' 12481' keyword: - Product Configuration - Augmented Reality - Model-based - Tool Support language: - iso: eng oa: '1' place: Cham project: - _id: '1' name: SFB 901 - _id: '4' name: SFB 901 - Project Area C - _id: '17' name: SFB 901 - Subproject C5 publication: Human-Centered Software Engineering. HCSE 2020 publisher: Springer series_title: Lecture Notes in Computer Science status: public title: 'ProConAR: A Tool Support for Model-based AR Product Configuration' type: conference user_id: '47208' volume: 12481 year: '2020' ... --- _id: '19738' author: - first_name: Marc full_name: Wende, Marc id: '71302' last_name: Wende - first_name: Kai full_name: Philippi, Kai last_name: Philippi - first_name: Eugeny full_name: Kenig, Eugeny id: '665' last_name: Kenig citation: ama: 'Wende M, Philippi K, Kenig E. Numerische Simulation von Gravidestillationsapparaten zur Trennung eines binären Ethanol/Wasser-Gemisches. In: 10. ProcessNet-Jahrestagung Und 34. DECHEMA-Jahrestagung Der Biotechnologen . 10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen . ; 2020.' apa: Wende, M., Philippi, K., & Kenig, E. (2020). Numerische Simulation von Gravidestillationsapparaten zur Trennung eines binären Ethanol/Wasser-Gemisches. 10. ProcessNet-Jahrestagung Und 34. DECHEMA-Jahrestagung Der Biotechnologen . 10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen 2020, Aachen. bibtex: '@inproceedings{Wende_Philippi_Kenig_2020, series={10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen }, title={Numerische Simulation von Gravidestillationsapparaten zur Trennung eines binären Ethanol/Wasser-Gemisches}, booktitle={10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen }, author={Wende, Marc and Philippi, Kai and Kenig, Eugeny}, year={2020}, collection={10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen } }' chicago: Wende, Marc, Kai Philippi, and Eugeny Kenig. “Numerische Simulation von Gravidestillationsapparaten Zur Trennung Eines Binären Ethanol/Wasser-Gemisches.” In 10. ProcessNet-Jahrestagung Und 34. DECHEMA-Jahrestagung Der Biotechnologen . 10. ProcessNet-Jahrestagung Und 34. DECHEMA-Jahrestagung Der Biotechnologen , 2020. ieee: M. Wende, K. Philippi, and E. Kenig, “Numerische Simulation von Gravidestillationsapparaten zur Trennung eines binären Ethanol/Wasser-Gemisches,” presented at the 10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen 2020, Aachen, 2020. mla: Wende, Marc, et al. “Numerische Simulation von Gravidestillationsapparaten Zur Trennung Eines Binären Ethanol/Wasser-Gemisches.” 10. ProcessNet-Jahrestagung Und 34. DECHEMA-Jahrestagung Der Biotechnologen , 2020. short: 'M. Wende, K. Philippi, E. Kenig, in: 10. ProcessNet-Jahrestagung Und 34. DECHEMA-Jahrestagung Der Biotechnologen , 2020.' conference: end_date: 24.09.2020 location: Aachen name: 10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen 2020 start_date: 21.09.2020 date_created: 2020-09-28T14:09:47Z date_updated: 2022-01-06T06:54:11Z department: - _id: '9' - _id: '145' language: - iso: eng publication: '10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen ' series_title: '10. ProcessNet-Jahrestagung und 34. DECHEMA-Jahrestagung der Biotechnologen ' status: public title: Numerische Simulation von Gravidestillationsapparaten zur Trennung eines binären Ethanol/Wasser-Gemisches type: conference user_id: '71302' year: '2020' ... --- _id: '20145' abstract: - lang: ger text: "Der Karosseriebau ist zunehmend durch die Verwendung unterschiedlicher Werkstoffe in Mischbauweise gekennzeichnet, was zu einem Einsatz von mechanischen Fügeverfahren geführt hat. Hieraus resultieren die Zielsetzungen, die mechanischen Fügeverfahren in ihrer Effizienz und ihren Einsatzbereichen zu erweitern, sowie die Anzahl der Experimente zu reduzieren und Entwicklungszyklen zu verkürzen. Dies erfolgt mit Unterstützung der numerischen Simulation. Neben der Beschreibung des plastischen Verhaltens gilt es auch, das Schädigungsverhalten abzubilden.\r\n\r\nDer Fügeprozess bzw. die Fügerichtung erfolgt senkrecht zur Blechoberfläche und führt somit zu einem dreidimensionalen Zustand der Fügelemente. Hieraus leitet sich die Herausforderung ab, das Werkstoffversagen in Abhängigkeit der Beanspruchungssituation zu beschreiben. Ein einfacher Ansatz zur Abbildung des Durchdringens ist ein geometrisches Trennkriterium.\r\n\r\nEin solches Kriterium basiert i.d.R. auf einem experimentell beobachteten Verhalten und ist somit nicht prognosefähig für Variationen bzgl. Werkzeugkonfigurationen, Blechdicken- und Werkstoffgüten-Kombinationen. In diesem Projekt wird das Schädigungsmodell GISSMO (Generalized Incremental Stress State dependent damage Model) verwendet, um die Entwicklung der duktilen Schädigung zu beschreiben und den Bruchbeginn während des Stanzniet- und Schneidclinchens vorherzusagen.\r\n\r\nDer Spannungszustand während der Prozesssimulation wird untersucht und die verschiedenen Schädigungsproben werden experimentell erprobt, um die Versagenskurven zu charakterisieren. Die Versagenskurven werden im Schädigungsmodell GISSMO definiert. Um die Genauigkeit des Modells zu gewährleisten, wird die Verifizierung des Modells durch die Simulation von Schädigungsproben mit dem Schädigungsmodell durchgeführt.\r\n\r\nZur Validierung des Modells wird die Simulation des Fügeprozesses mit dem Schädigungsmodell durchgeführt und die Ergebnisse von Simulation und Experiment verglichen. Darüber hinaus werden Sensitivitätsanalysen durchgeführt, um die Einflüsse der Fertigungsprozesse, der Lackierung und des Diskretisierungsgrades auf das Schädigungsverhalten des Materials zu identifizieren.\r\nDas IGF-Vorhaben „Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren\" der Forschungsvereinigung EFB e.V. wurde unter der Fördernummer AiF 19452N über die Arbeitsgemeinschaft industrieller Forschungsvereinigungen (AiF) im Rahmen des Programms zur Förderung der Industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium für Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages gefördert. Der Abschlussbericht ist als EFB-Forschungsbericht Nr. 527 erschienen und bei der EFB-Geschäftsstelle und im Buchhandel erhältlich." - lang: eng text: "The body construction is increasingly characterized by the use of different materials in multi-material-design, which has led to the application of a variety of mechanical joining processes. To enhance the mechanical joining processes in their efficiency, numerical simulation can be used as an effective tool to reduce the number of experiments and shorten the product development cycles. In addition to the description of the plasticity, the damage and the failure behavior of material must also be taken into account.\r\n\r\nIn self-pierce riveting simulations, the rivet penetrates perpendicular into the sheet surface and produces a three-dimensional stress state. Hence, it is essential to describe the material failure as a function of a three-dimensional stress state.\r\n\r\nA simple approach to describe the separation of upper sheet in the simulation of the joining process is based on a geometric separation criterion. Such a criterion is not predictive und cannot be used in case of variations in tool configurations, sheet thickness, and material combinations.\r\n\r\nIn this project, the damage model GISSMO (Generalized Incremental Stress State dependent damage Model) is used to describe the evolution of ductile damage and predict the onset of fracture during the self-piercing riveting and shear-clinching.\r\n\r\nThe stress state during the process simulation is studied and the variety of damage specimens are experimental examined to characterize the failure curves. The failure curves are defined in the GISSMO damage model. To ensure the accuracy of the model, the verification of the model using simulation of damage specimens with damage model is performed.\r\n\r\nFor the validation of model, the simulation of the joining process using the damage model is carried out and the results of simulation and experiment are compared. Furthermore, sensitivity analyses are performed to identify the influences of manufacturing processes, the evaluation method, and the degree of discretization on the damage behavior of material." author: - first_name: Mortaza full_name: Otroshi, Mortaza id: '71269' last_name: Otroshi orcid: 0000-0002-8652-9209 - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: Otroshi M, Meschut G. Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren. Europäische Forschungsgesellschaft für Blechverarbeitung e.V.; 2020. apa: Otroshi, M., & Meschut, G. (2020). Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren. Europäische Forschungsgesellschaft für Blechverarbeitung e.V. bibtex: '@book{Otroshi_Meschut_2020, title={Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren}, publisher={Europäische Forschungsgesellschaft für Blechverarbeitung e.V.}, author={Otroshi, Mortaza and Meschut, Gerson}, year={2020} }' chicago: Otroshi, Mortaza, and Gerson Meschut. Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren. Europäische Forschungsgesellschaft für Blechverarbeitung e.V., 2020. ieee: M. Otroshi and G. Meschut, Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren. Europäische Forschungsgesellschaft für Blechverarbeitung e.V., 2020. mla: Otroshi, Mortaza, and Gerson Meschut. Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren. Europäische Forschungsgesellschaft für Blechverarbeitung e.V., 2020. short: M. Otroshi, G. Meschut, Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren, Europäische Forschungsgesellschaft für Blechverarbeitung e.V., 2020. date_created: 2020-10-21T06:41:26Z date_updated: 2022-01-06T06:54:20Z ddc: - '620' department: - _id: '157' file: - access_level: closed content_type: image/jpeg creator: motroshi date_created: 2021-02-03T12:14:18Z date_updated: 2021-02-03T12:14:18Z file_id: '21151' file_name: Schädigunsmodellierung__efb527.jpg file_size: 12718 relation: main_file success: 1 file_date_updated: 2021-02-03T12:14:18Z has_accepted_license: '1' language: - iso: ger main_file_link: - url: https://ble-x.de/mydocs/1606 page: '182' publication_identifier: isbn: - 978-3-86776-582-4 publication_status: published publisher: Europäische Forschungsgesellschaft für Blechverarbeitung e.V. report_number: '527' status: public title: Methodenentwicklung zur Schädigungsmodellierung für die numerische Prozesssimulation mechanischer Fügeverfahren type: report user_id: '71269' year: '2020' ... --- _id: '20146' abstract: - lang: eng text: "Joining technology is regarded as a key technology for reducing energy consumption and CO2 imitation as well as the use of innovative materials and development of new, resource-saving products. Punch riveting is a widely used and established joining process in many sectors. The white and brown goods, electrical engineering, construction and, in particular, the automotive industry are some of the sectors mentioned here.\r\n\r\nSince the design and assessment of punch rivet components with regard to structural durability can only be carried out experimentally using prototypes due to a lack of experience and calculation concepts, the improvement of this uneconomical and time-consuming procedure is the goal of this contribution.\r\n\r\nTherefore, a numerical simulation and design method for cyclically loads punched riveted joints shall be introduced. This concept shall be based on the notch strain concept.\r\n\r\nThe following steps are necessary to achieve the goal shown above:\r\n\r\n Tensile tests on all materials involved in the joint for determination of tensile strength and quasi-static stress-strain curves\r\n Estimation of the cyclic material properties from the tensile strength in order to obtain the strain-life curve and the cyclic stress-strain curve\r\n Estimation of mean stress sensitivity from the tensile strength to conduct an amplitude transformation for variable amplitude loadings.\r\n Execution of a 2D forming simulation of the joining process to determine the geometry and the stresses and degrees of deformation present in the connection\r\n Transferring the results of the forming simulation into a static-mechanical load simulation for determining the relation between the external load and the elastic-plastic strain at the critical point\r\n Estimation of the service life by means of the damage parameter Wöhler curves calculated from the strain-life curve\r\n\r\nIn order to verify the simulation and calculation method, service life investigations have been carried out on punched riveted components under constant and variable amplitude load.\r\n\r\nThe test results, as well as the workflow through the fatigue assessment and its accuracy in estimation the fatigue life will be shown in this contribution." author: - first_name: Lukas full_name: Masendorf, Lukas last_name: Masendorf - first_name: Michael full_name: Wächter, Michael last_name: Wächter - first_name: Stephan full_name: Horstmann, Stephan last_name: Horstmann - first_name: Mortaza full_name: Otroshi, Mortaza id: '71269' last_name: Otroshi orcid: 0000-0002-8652-9209 - first_name: Alfons full_name: Esderts, Alfons last_name: Esderts - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Masendorf L, Wächter M, Horstmann S, Otroshi M, Esderts A, Meschut G. Linear damage accumulation of self-pierce riveted joints. In: Deutscher Verband für Materialforschung und -prüfung e.V.; 2020.' apa: 'Masendorf, L., Wächter, M., Horstmann, S., Otroshi, M., Esderts, A., & Meschut, G. (2020). Linear damage accumulation of self-pierce riveted joints. Presented at the Fourth International Conference on Material and Component Performance under Variable Amplitude Loading, Darmstadt, Germany: Deutscher Verband für Materialforschung und -prüfung e.V.' bibtex: '@inproceedings{Masendorf_Wächter_Horstmann_Otroshi_Esderts_Meschut_2020, title={Linear damage accumulation of self-pierce riveted joints}, publisher={Deutscher Verband für Materialforschung und -prüfung e.V.}, author={Masendorf, Lukas and Wächter, Michael and Horstmann, Stephan and Otroshi, Mortaza and Esderts, Alfons and Meschut, Gerson}, year={2020} }' chicago: Masendorf, Lukas, Michael Wächter, Stephan Horstmann, Mortaza Otroshi, Alfons Esderts, and Gerson Meschut. “Linear Damage Accumulation of Self-Pierce Riveted Joints.” Deutscher Verband für Materialforschung und -prüfung e.V., 2020. ieee: L. Masendorf, M. Wächter, S. Horstmann, M. Otroshi, A. Esderts, and G. Meschut, “Linear damage accumulation of self-pierce riveted joints,” presented at the Fourth International Conference on Material and Component Performance under Variable Amplitude Loading, Darmstadt, Germany, 2020. mla: Masendorf, Lukas, et al. Linear Damage Accumulation of Self-Pierce Riveted Joints. Deutscher Verband für Materialforschung und -prüfung e.V., 2020. short: 'L. Masendorf, M. Wächter, S. Horstmann, M. Otroshi, A. Esderts, G. Meschut, in: Deutscher Verband für Materialforschung und -prüfung e.V., 2020.' conference: end_date: 2020-04-01 location: Darmstadt, Germany name: Fourth International Conference on Material and Component Performance under Variable Amplitude Loading start_date: 2020-03-30 date_created: 2020-10-21T06:55:12Z date_updated: 2022-01-06T06:54:20Z department: - _id: '157' keyword: - punch rivet - notch strain conept - structural durability language: - iso: eng publication_identifier: isbn: - 978-3-9820591-0-5 publication_status: published publisher: Deutscher Verband für Materialforschung und -prüfung e.V. status: public title: Linear damage accumulation of self-pierce riveted joints type: conference user_id: '71269' year: '2020' ... --- _id: '20233' abstract: - lang: eng text: The challenge of designing new tunable nonlinear dielectric materials with tailored properties has attracted an increasing amount of interest recently. Herein, we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite consisting of equilibrium distributions of circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable, circular cylinders) of a dielectric phase randomly dispersed in a continuous matrix of a paraelectric phase. The random microstructures were generated using the Metropolis Monte Carlo algorithm. The evaluation of the effective permittivity and tunability were carried out by employing either a Landau thermodynamic model or its Johnson’s approximation to describe the field-dependent permittivity of the paraelectric phase and solving continuum-electrostatics equations using finite element calculations. We reveal that the percolation threshold in this composite governs the critical behavior of the effective permittivity and tunability. For microstructures below the percolation threshold, our simulations demonstrate a strong nonlinear behaviour of the field-dependent effective permittivity and very high tunability that increases as a function of dielectric phase concentration. Above the percolation threshold, the effective permittivity shows the tendency to linearization and the tunability dramatically drops down. The highly reduced permittivity and extraordinarily high tunability are obtained for the composites with dielectric impenetrable disks at high concentrations, in which the triggering of the percolation transition is avoided. The reported results cast light on distinct nonlinear behaviour of 2D and 3D stochastic composites and can guide the design of novel composites with the controlled morphology and tailored permittivity and tunability. author: - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Stanislav full_name: Smirnov, Stanislav last_name: Smirnov - first_name: Pious Mathews Mulavarickal full_name: Jose, Pious Mathews Mulavarickal last_name: Jose - first_name: Christian full_name: Brosseau, Christian last_name: Brosseau - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Myroshnychenko V, Smirnov S, Jose PMM, Brosseau C, Förstner J. Nonlinear dielectric properties of random paraelectric-dielectric composites. Acta Materialia. 2020;203:116432. doi:10.1016/j.actamat.2020.10.051 apa: Myroshnychenko, V., Smirnov, S., Jose, P. M. M., Brosseau, C., & Förstner, J. (2020). Nonlinear dielectric properties of random paraelectric-dielectric composites. Acta Materialia, 203, 116432. https://doi.org/10.1016/j.actamat.2020.10.051 bibtex: '@article{Myroshnychenko_Smirnov_Jose_Brosseau_Förstner_2020, title={Nonlinear dielectric properties of random paraelectric-dielectric composites}, volume={203}, DOI={10.1016/j.actamat.2020.10.051}, journal={Acta Materialia}, author={Myroshnychenko, Viktor and Smirnov, Stanislav and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens}, year={2020}, pages={116432} }' chicago: 'Myroshnychenko, Viktor, Stanislav Smirnov, Pious Mathews Mulavarickal Jose, Christian Brosseau, and Jens Förstner. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric Composites.” Acta Materialia 203 (2020): 116432. https://doi.org/10.1016/j.actamat.2020.10.051.' ieee: V. Myroshnychenko, S. Smirnov, P. M. M. Jose, C. Brosseau, and J. Förstner, “Nonlinear dielectric properties of random paraelectric-dielectric composites,” Acta Materialia, vol. 203, p. 116432, 2020. mla: Myroshnychenko, Viktor, et al. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric Composites.” Acta Materialia, vol. 203, 2020, p. 116432, doi:10.1016/j.actamat.2020.10.051. short: V. Myroshnychenko, S. Smirnov, P.M.M. Jose, C. Brosseau, J. Förstner, Acta Materialia 203 (2020) 116432. date_created: 2020-10-30T13:51:42Z date_updated: 2022-01-06T06:54:24Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1016/j.actamat.2020.10.051 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2020-10-30T13:52:58Z date_updated: 2020-10-30T13:52:58Z file_id: '20234' file_name: 2020-10 Myroshnychenko - Acta Material (accepted preprint)_compressed.pdf file_size: 3934721 relation: main_file title: (Accepted Preprint) file_date_updated: 2020-10-30T13:52:58Z has_accepted_license: '1' intvolume: ' 203' language: - iso: eng oa: '1' page: '116432' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Acta Materialia publication_identifier: issn: - 1359-6454 publication_status: published status: public title: Nonlinear dielectric properties of random paraelectric-dielectric composites type: journal_article user_id: '158' volume: 203 year: '2020' ... --- _id: '20273' author: - first_name: Max full_name: Biegler, Max last_name: Biegler - first_name: Michael full_name: Rethmeier, Michael last_name: Rethmeier - first_name: Christoph full_name: Böhne, Christoph id: '22483' last_name: Böhne - first_name: Gerson full_name: Meschut, Gerson id: '32056' last_name: Meschut orcid: 0000-0002-2763-1246 citation: ama: 'Biegler M, Rethmeier M, Böhne C, Meschut G. Resistance spot welding simulation can determine the critical stress- and strain-conditions leading to liquid metal embrittlement formation. In: Joining in Car Body Engineering. Bad Nauheim; 2020.' apa: Biegler, M., Rethmeier, M., Böhne, C., & Meschut, G. (2020). Resistance spot welding simulation can determine the critical stress- and strain-conditions leading to liquid metal embrittlement formation. In Joining in Car Body Engineering. Bad Nauheim. bibtex: '@inproceedings{Biegler_Rethmeier_Böhne_Meschut_2020, place={Bad Nauheim}, title={Resistance spot welding simulation can determine the critical stress- and strain-conditions leading to liquid metal embrittlement formation}, booktitle={Joining in Car Body Engineering}, author={Biegler, Max and Rethmeier, Michael and Böhne, Christoph and Meschut, Gerson}, year={2020} }' chicago: Biegler, Max, Michael Rethmeier, Christoph Böhne, and Gerson Meschut. “Resistance Spot Welding Simulation Can Determine the Critical Stress- and Strain-Conditions Leading to Liquid Metal Embrittlement Formation.” In Joining in Car Body Engineering. Bad Nauheim, 2020. ieee: M. Biegler, M. Rethmeier, C. Böhne, and G. Meschut, “Resistance spot welding simulation can determine the critical stress- and strain-conditions leading to liquid metal embrittlement formation,” in Joining in Car Body Engineering, 2020. mla: Biegler, Max, et al. “Resistance Spot Welding Simulation Can Determine the Critical Stress- and Strain-Conditions Leading to Liquid Metal Embrittlement Formation.” Joining in Car Body Engineering, 2020. short: 'M. Biegler, M. Rethmeier, C. Böhne, G. Meschut, in: Joining in Car Body Engineering, Bad Nauheim, 2020.' date_created: 2020-11-03T13:59:29Z date_updated: 2022-01-06T06:54:25Z department: - _id: '157' language: - iso: eng place: Bad Nauheim publication: Joining in Car Body Engineering status: public title: Resistance spot welding simulation can determine the critical stress- and strain-conditions leading to liquid metal embrittlement formation type: conference user_id: '22483' year: '2020' ...