In this work the solubility of 15 amino acids and 18 peptides in aqueous 2-propanol solutions was successfully modelled using PC-SAFT that used recently determined experimental melting properties as input data.
","lang":"eng"}],"publication":"Physical Chemistry Chemical Physics","language":[{"iso":"eng"}],"keyword":["Physical and Theoretical Chemistry","General Physics and Astronomy"]},{"status":"public","type":"conference_abstract","language":[{"iso":"eng"}],"_id":"26829","user_id":"72973","department":[{"_id":"9"},{"_id":"145"}],"year":"2021","citation":{"ama":"Bothe M, Fedorov A, Frei H, Kenig E. Modeling and investigations of chemical absorption process for prevention of emergencies . In: ; 2021.","ieee":"M. Bothe, A. Fedorov, H. Frei, and E. Kenig, “Modeling and investigations of chemical absorption process for prevention of emergencies ,” presented at the International Conference on Mathematics in (bio)Chemical Kinetics and Engineering, Shanghai, China (online), 2021.","chicago":"Bothe, Mike, Alexander Fedorov, Herrmann Frei, and Eugeny Kenig. “Modeling and Investigations of Chemical Absorption Process for Prevention of Emergencies ,” 2021.","bibtex":"@inproceedings{Bothe_Fedorov_Frei_Kenig_2021, title={Modeling and investigations of chemical absorption process for prevention of emergencies }, author={Bothe, Mike and Fedorov, Alexander and Frei, Herrmann and Kenig, Eugeny}, year={2021} }","mla":"Bothe, Mike, et al. Modeling and Investigations of Chemical Absorption Process for Prevention of Emergencies . 2021.","short":"M. Bothe, A. Fedorov, H. Frei, E. Kenig, in: 2021.","apa":"Bothe, M., Fedorov, A., Frei, H., & Kenig, E. (2021). Modeling and investigations of chemical absorption process for prevention of emergencies . International Conference on Mathematics in (bio)Chemical Kinetics and Engineering, Shanghai, China (online)."},"title":"Modeling and investigations of chemical absorption process for prevention of emergencies ","conference":{"name":"International Conference on Mathematics in (bio)Chemical Kinetics and Engineering","start_date":"2021-10-24","end_date":"2021-10-27","location":"Shanghai, China (online)"},"date_updated":"2022-03-28T08:21:31Z","date_created":"2021-10-25T12:36:54Z","author":[{"first_name":"Mike","id":"72973","full_name":"Bothe, Mike","last_name":"Bothe"},{"first_name":"Alexander","full_name":"Fedorov, Alexander","last_name":"Fedorov"},{"first_name":"Herrmann","full_name":"Frei, Herrmann","last_name":"Frei"},{"first_name":"Eugeny","last_name":"Kenig","id":"665","full_name":"Kenig, Eugeny"}]},{"type":"journal_article","publication":"IOP Conference Series: Materials Science and Engineering","status":"public","abstract":[{"lang":"eng","text":"The increasing economic and ecological demands on the mobility sector require efforts to reduce resource consumption in both the production and utilization phases. The use of lightweight construction technologies can save material and increase energy efficiency during operation. Multi-material systems consisting of different materials and geometries are used to achieve weight reduction. Since conventional joining processes reach their limits in the connection of these components, new methods and technologies are necessary in order to be able to react versatilely to varying process and disturbance variables. For fundamental investigations of new possibilities in joining technology, numerical investigations are helpful to identify process parameters. To generate valid results, robust and efficient material models are developed which are adapted to the requirements of versatile joining technologies, for instance to the high plastic strains associated with self-piercing riveting. To describe the inherent strain-induced plastic orthotropy of sheet metal an anisotropic Hill-plasticity model is formulated. Tensile tests for different sheet orientations are conducted both experimentally and numerically to adjust the anisotropic material parameters by inverse parameter identification for aluminium EN AW-6014 and steel HCT590X. Then, the layer compression test is used to validate the model and the previously identified parameters."}],"user_id":"68518","project":[{"_id":"130","name":"TRR 285: TRR 285","grant_number":"418701707"},{"_id":"131","name":"TRR 285 - A: TRR 285 - Project Area A"},{"name":"TRR 285 – A05: TRR 285 - Subproject A05","_id":"139"},{"_id":"133","name":"TRR 285 - C: TRR 285 - Project Area C"},{"name":"TRR 285 – C02: TRR 285 - Subproject C02","_id":"146"}],"_id":"30647","language":[{"iso":"eng"}],"citation":{"ieee":"J. Friedlein, S. Wituschek, M. Lechner, J. Mergheim, and P. Steinmann, “Inverse parameter identification of an anisotropic plasticity model for sheet metal,” IOP Conference Series: Materials Science and Engineering, vol. 1157, p. 012004, 2021, doi: 10.1088/1757-899X/1157/1/012004.","chicago":"Friedlein, J., S. Wituschek, M. Lechner, J. Mergheim, and P. Steinmann. “Inverse Parameter Identification of an Anisotropic Plasticity Model for Sheet Metal.” IOP Conference Series: Materials Science and Engineering 1157 (2021): 012004. https://doi.org/10.1088/1757-899X/1157/1/012004.","mla":"Friedlein, J., et al. “Inverse Parameter Identification of an Anisotropic Plasticity Model for Sheet Metal.” IOP Conference Series: Materials Science and Engineering, vol. 1157, 2021, p. 012004, doi:10.1088/1757-899X/1157/1/012004.","short":"J. Friedlein, S. Wituschek, M. Lechner, J. Mergheim, P. Steinmann, IOP Conference Series: Materials Science and Engineering 1157 (2021) 012004.","bibtex":"@article{Friedlein_Wituschek_Lechner_Mergheim_Steinmann_2021, title={Inverse parameter identification of an anisotropic plasticity model for sheet metal}, volume={1157}, DOI={10.1088/1757-899X/1157/1/012004}, journal={IOP Conference Series: Materials Science and Engineering}, author={Friedlein, J. and Wituschek, S. and Lechner, M. and Mergheim, J. and Steinmann, P.}, year={2021}, pages={012004} }","apa":"Friedlein, J., Wituschek, S., Lechner, M., Mergheim, J., & Steinmann, P. (2021). Inverse parameter identification of an anisotropic plasticity model for sheet metal. IOP Conference Series: Materials Science and Engineering, 1157, 012004. https://doi.org/10.1088/1757-899X/1157/1/012004","ama":"Friedlein J, Wituschek S, Lechner M, Mergheim J, Steinmann P. Inverse parameter identification of an anisotropic plasticity model for sheet metal. IOP Conference Series: Materials Science and Engineering. 2021;1157:012004. doi:10.1088/1757-899X/1157/1/012004"},"intvolume":" 1157","page":"012004","year":"2021","author":[{"first_name":"J.","full_name":"Friedlein, J.","last_name":"Friedlein"},{"last_name":"Wituschek","full_name":"Wituschek, S.","first_name":"S."},{"first_name":"M.","full_name":"Lechner, M.","last_name":"Lechner"},{"full_name":"Mergheim, J.","last_name":"Mergheim","first_name":"J."},{"last_name":"Steinmann","full_name":"Steinmann, P.","first_name":"P."}],"date_created":"2022-03-28T12:42:10Z","volume":1157,"date_updated":"2022-03-29T12:45:57Z","doi":"10.1088/1757-899X/1157/1/012004","title":"Inverse parameter identification of an anisotropic plasticity model for sheet metal"},{"abstract":[{"text":"As a new and innovative processing method for fabrication for fiber-reinforced thermoplastic composites (CFRTs), the feasibility of ultrasonic welding technology was proven in several studies. This method offers potential for the direct manufacturing of CFRT–metal structures via embedded pin structures. Despite the previous studies, a deeper understanding of the process of energy input and whether fibers work as energy directors and consequently can, in combination with chosen processing parameters, influence the consolidation quality of the CFRTs, is still unknown. Consequently, the aim of this work is to establish a deeper process understanding of the ultrasonic direct impregnation of fiber-reinforced thermoplastics with an emphasis on the fiber’s function as energy directors. Based on the generated insights, a better assessment of the feasibility of direct, hybrid part manufacturing is possible. The produced samples were primarily evaluated by optical and mechanical test methods. It is demonstrated that with higher welding time and amplitude, a better consolidation quality can be achieved and that independent of the process parameters chosen in this study, no significant fiber breakage occurs. This is interpreted as a sign of a gentle impregnation process. Furthermore, based on the examination of single roving and 5-layer set-ups, it is shown that the glass fibers function as energy directors and can influence the transformation of sonic energy into thermal energy. In comparison to industrially available CFRT material, the mechanical properties are weaker, but materials and processes offer potential for significant improvement. Based on these findings, proposals for a direct impregnation and joining process are made.","lang":"eng"}],"status":"public","publication":"Journal of Composites Science","type":"journal_article","language":[{"iso":"eng"}],"_id":"30645","project":[{"grant_number":"418701707","_id":"130","name":"TRR 285: TRR 285"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 – C01: TRR 285 - Subproject C01","_id":"145"}],"user_id":"68518","year":"2021","page":"239","intvolume":" 5","citation":{"short":"J. Popp, M. Wolf, T. Mattner, D. Drummer, Journal of Composites Science 5 (2021) 239.","mla":"Popp, J., et al. “Energy Direction in Ultrasonic Impregnation of Continuous Fiber-Reinforced Thermoplastics.” Journal of Composites Science, vol. 5, 2021, p. 239, doi:10.3390/jcs5090239.","bibtex":"@article{Popp_Wolf_Mattner_Drummer_2021, title={Energy direction in ultrasonic impregnation of continuous fiber-reinforced thermoplastics}, volume={5}, DOI={10.3390/jcs5090239}, journal={Journal of Composites Science}, author={Popp, J. and Wolf, M. and Mattner, T. and Drummer, D.}, year={2021}, pages={239} }","apa":"Popp, J., Wolf, M., Mattner, T., & Drummer, D. (2021). Energy direction in ultrasonic impregnation of continuous fiber-reinforced thermoplastics. Journal of Composites Science, 5, 239. https://doi.org/10.3390/jcs5090239","ama":"Popp J, Wolf M, Mattner T, Drummer D. Energy direction in ultrasonic impregnation of continuous fiber-reinforced thermoplastics. Journal of Composites Science. 2021;5:239. doi:10.3390/jcs5090239","ieee":"J. Popp, M. Wolf, T. Mattner, and D. Drummer, “Energy direction in ultrasonic impregnation of continuous fiber-reinforced thermoplastics,” Journal of Composites Science, vol. 5, p. 239, 2021, doi: 10.3390/jcs5090239.","chicago":"Popp, J., M. Wolf, T. Mattner, and D. Drummer. “Energy Direction in Ultrasonic Impregnation of Continuous Fiber-Reinforced Thermoplastics.” Journal of Composites Science 5 (2021): 239. https://doi.org/10.3390/jcs5090239."},"title":"Energy direction in ultrasonic impregnation of continuous fiber-reinforced thermoplastics","doi":"10.3390/jcs5090239","date_updated":"2022-03-29T12:43:36Z","volume":5,"author":[{"last_name":"Popp","full_name":"Popp, J.","first_name":"J."},{"first_name":"M.","full_name":"Wolf, M.","last_name":"Wolf"},{"first_name":"T.","full_name":"Mattner, T.","last_name":"Mattner"},{"last_name":"Drummer","full_name":"Drummer, D.","first_name":"D."}],"date_created":"2022-03-28T12:25:45Z"},{"doi":"10.3390/jmmp5040105","title":"Influence of the production process on the binding mechanism of clinched aluminum steel mixed compounds","volume":5,"author":[{"full_name":"Kalich, J.","last_name":"Kalich","first_name":"J."},{"first_name":"U.","last_name":"Füssel","full_name":"Füssel, U."}],"date_created":"2022-03-28T12:22:53Z","date_updated":"2022-03-29T12:41:44Z","page":"105","intvolume":" 5","citation":{"ama":"Kalich J, Füssel U. Influence of the production process on the binding mechanism of clinched aluminum steel mixed compounds. Journal of Manufacturing and Materials Processing. 2021;5:105. doi:10.3390/jmmp5040105","ieee":"J. Kalich and U. Füssel, “Influence of the production process on the binding mechanism of clinched aluminum steel mixed compounds,” Journal of Manufacturing and Materials Processing, vol. 5, p. 105, 2021, doi: 10.3390/jmmp5040105.","chicago":"Kalich, J., and U. Füssel. “Influence of the Production Process on the Binding Mechanism of Clinched Aluminum Steel Mixed Compounds.” Journal of Manufacturing and Materials Processing 5 (2021): 105. https://doi.org/10.3390/jmmp5040105.","bibtex":"@article{Kalich_Füssel_2021, title={Influence of the production process on the binding mechanism of clinched aluminum steel mixed compounds}, volume={5}, DOI={10.3390/jmmp5040105}, journal={Journal of Manufacturing and Materials Processing}, author={Kalich, J. and Füssel, U.}, year={2021}, pages={105} }","short":"J. Kalich, U. Füssel, Journal of Manufacturing and Materials Processing 5 (2021) 105.","mla":"Kalich, J., and U. Füssel. “Influence of the Production Process on the Binding Mechanism of Clinched Aluminum Steel Mixed Compounds.” Journal of Manufacturing and Materials Processing, vol. 5, 2021, p. 105, doi:10.3390/jmmp5040105.","apa":"Kalich, J., & Füssel, U. (2021). Influence of the production process on the binding mechanism of clinched aluminum steel mixed compounds. Journal of Manufacturing and Materials Processing, 5, 105. https://doi.org/10.3390/jmmp5040105"},"year":"2021","language":[{"iso":"eng"}],"user_id":"68518","_id":"30643","project":[{"name":"TRR 285: TRR 285","_id":"130","grant_number":"418701707"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A04: TRR 285 - Subproject A04","_id":"138"}],"status":"public","abstract":[{"text":"The multi-material design and the adaptability of a modern process chain require joining connections with specifically adjustable mechanical, thermal, chemical, or electrical properties. Previous considerations primarily focused on the mechanical properties. The multitude of possible combinations of requirements, materials, and component- and joining-geometry makes an empirical determination of these joining properties for the clinching process impossible. Based on the established and empirical procedure, there is currently no model that takes into account all questions of joinability—i.e., the materials (suitability for joining), design (security of joining), and production (joining possibility)—that allows a calculation of the properties that can be achieved. It is therefore necessary to describe the physical properties of the joint as a function of the three binding mechanisms—form closure, force closure, and material closure—in relation to the application. This approach illustrates the relationships along the causal chain “joint requirement-binding mechanism-joining parameters” and improves the adaptability of the mechanical joining technology. Geometrical properties of clinch connections of the combination of aluminum and steel are compared in a metallographic cross-section. The mechanical stress state of the rotationally symmetrical clinch points is qualified with a torsion test and by measuring the electrical resistance in the base material, in the clinch joint, and during the production cycle (after clinching, before precipitation hardening and after precipitation hardening).","lang":"eng"}],"publication":"Journal of Manufacturing and Materials Processing","type":"journal_article"},{"project":[{"grant_number":"418701707","name":"TRR 285: TRR 285","_id":"130"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"_id":"139","name":"TRR 285 – A05: TRR 285 - Subproject A05"}],"_id":"30644","user_id":"68518","language":[{"iso":"eng"}],"type":"journal_article","publication":"Computational Mechanics","abstract":[{"lang":"eng","text":"Computational homogenization is a powerful tool allowing to obtain homogenized properties of materials on the macroscale from simulations of the underlying microstructure. The response of the microstructure is, however, strongly affected by variations in the microstructure geometry. In particular, we consider heterogeneous materials with randomly distributed non-overlapping inclusions, which radii are also random. In this work we extend the earlier proposed non-deterministic computational homogenization framework to plastic materials, thereby increasing the model versatility and overall realism. We apply novel soft periodic boundary conditions and estimate their effect in case of non-periodic material microstructures. We study macroscopic plasticity signatures like the macroscopic von-Mises stress and make useful conclusions for further constitutive modeling. Simulations demonstrate the effect of the novel boundary conditions, which significantly differ from the standard periodic boundary conditions, and the large influence of parameter variations and hence the importance of the stochastic modeling."}],"status":"public","date_updated":"2022-03-29T12:42:38Z","author":[{"first_name":"D.","last_name":"Pivovarov","full_name":"Pivovarov, D."},{"first_name":"J.","full_name":"Mergheim, J.","last_name":"Mergheim"},{"last_name":"Willner","full_name":"Willner, K.","first_name":"K."},{"full_name":"Steinmann, P.","last_name":"Steinmann","first_name":"P."}],"date_created":"2022-03-28T12:24:19Z","title":"Stochastic local FEM for computational homogenization of heterogeneous materials exhibiting large plastic deformations","doi":"10.1007/s00466-021-02099-x","year":"2021","citation":{"mla":"Pivovarov, D., et al. “Stochastic Local FEM for Computational Homogenization of Heterogeneous Materials Exhibiting Large Plastic Deformations.” Computational Mechanics, 2021, doi:10.1007/s00466-021-02099-x.","bibtex":"@article{Pivovarov_Mergheim_Willner_Steinmann_2021, title={Stochastic local FEM for computational homogenization of heterogeneous materials exhibiting large plastic deformations}, DOI={10.1007/s00466-021-02099-x}, journal={Computational Mechanics}, author={Pivovarov, D. and Mergheim, J. and Willner, K. and Steinmann, P.}, year={2021} }","short":"D. Pivovarov, J. Mergheim, K. Willner, P. Steinmann, Computational Mechanics (2021).","apa":"Pivovarov, D., Mergheim, J., Willner, K., & Steinmann, P. (2021). Stochastic local FEM for computational homogenization of heterogeneous materials exhibiting large plastic deformations. Computational Mechanics. https://doi.org/10.1007/s00466-021-02099-x","ama":"Pivovarov D, Mergheim J, Willner K, Steinmann P. Stochastic local FEM for computational homogenization of heterogeneous materials exhibiting large plastic deformations. Computational Mechanics. Published online 2021. doi:10.1007/s00466-021-02099-x","ieee":"D. Pivovarov, J. Mergheim, K. Willner, and P. Steinmann, “Stochastic local FEM for computational homogenization of heterogeneous materials exhibiting large plastic deformations,” Computational Mechanics, 2021, doi: 10.1007/s00466-021-02099-x.","chicago":"Pivovarov, D., J. Mergheim, K. Willner, and P. Steinmann. “Stochastic Local FEM for Computational Homogenization of Heterogeneous Materials Exhibiting Large Plastic Deformations.” Computational Mechanics, 2021. https://doi.org/10.1007/s00466-021-02099-x."}},{"doi":"10.1002/pamm.202100068","title":"Anisotropic plasticity‐damage material model for sheet metal — Regularised single surface formulation","volume":21,"date_created":"2022-03-28T12:18:16Z","author":[{"first_name":"J.","last_name":"Friedlein","full_name":"Friedlein, J."},{"first_name":"J.","last_name":"Mergheim","full_name":"Mergheim, J."},{"last_name":"Steinmann","full_name":"Steinmann, P.","first_name":"P."}],"date_updated":"2022-03-29T12:40:59Z","intvolume":" 21","citation":{"apa":"Friedlein, J., Mergheim, J., & Steinmann, P. (2021). Anisotropic plasticity‐damage material model for sheet metal — Regularised single surface formulation. PAMM, 21. https://doi.org/10.1002/pamm.202100068","short":"J. Friedlein, J. Mergheim, P. Steinmann, PAMM 21 (2021).","mla":"Friedlein, J., et al. “Anisotropic Plasticity‐damage Material Model for Sheet Metal — Regularised Single Surface Formulation.” PAMM, vol. 21, 2021, doi:10.1002/pamm.202100068.","bibtex":"@article{Friedlein_Mergheim_Steinmann_2021, title={Anisotropic plasticity‐damage material model for sheet metal — Regularised single surface formulation}, volume={21}, DOI={10.1002/pamm.202100068}, journal={PAMM}, author={Friedlein, J. and Mergheim, J. and Steinmann, P.}, year={2021} }","ama":"Friedlein J, Mergheim J, Steinmann P. Anisotropic plasticity‐damage material model for sheet metal — Regularised single surface formulation. PAMM. 2021;21. doi:10.1002/pamm.202100068","chicago":"Friedlein, J., J. Mergheim, and P. Steinmann. “Anisotropic Plasticity‐damage Material Model for Sheet Metal — Regularised Single Surface Formulation.” PAMM 21 (2021). https://doi.org/10.1002/pamm.202100068.","ieee":"J. Friedlein, J. Mergheim, and P. Steinmann, “Anisotropic plasticity‐damage material model for sheet metal — Regularised single surface formulation,” PAMM, vol. 21, 2021, doi: 10.1002/pamm.202100068."},"year":"2021","language":[{"iso":"eng"}],"user_id":"68518","_id":"30642","project":[{"_id":"130","name":"TRR 285: TRR 285","grant_number":"418701707"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A05: TRR 285 - Subproject A05","_id":"139"}],"status":"public","abstract":[{"text":"Sheet metal forming as well as mechanical joining demand increasingly accurate and efficient material modelling to capture large deformations, the inherent sheet orthotropy and even process-induced damage, which is expected to be influential. To account for large strains the additive logarithmic strain space is utilised that enables a straightforward incorporation of plastic anisotropy, herein modelled by a Hill48 yield function. A gradient-enhancement is used to equip the ductile damage model with an internal length scale curing the damage-induced localisation. An affine combination of the local and non-local softening variable is derived enabling a more efficient single surface formulation for the regularised plasticity-damage material model.","lang":"eng"}],"publication":"PAMM","type":"journal_article"},{"type":"conference","status":"public","department":[{"_id":"157"}],"user_id":"34782","_id":"20807","project":[{"_id":"130","name":"TRR 285: TRR 285","grant_number":"418701707"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"name":"TRR 285 – A01: TRR 285 - Subproject A01","_id":"135"}],"language":[{"iso":"eng"}],"publication_status":"submitted","citation":{"chicago":"Bielak, Christian Roman, Max Böhnke, Mathias Bobbert, and Gerson Meschut. “Further Development of a Numerical Method for Analyzing the Load Capacity of Clinched Joints in Versatile Process Chains.” ESAFORM 2021, n.d. https://doi.org/10.25518/esaform21.4298.","ieee":"C. R. Bielak, M. Böhnke, M. Bobbert, and G. Meschut, “Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains,” presented at the ESAFORM 2021, Lüttich, doi: 10.25518/esaform21.4298.","apa":"Bielak, C. R., Böhnke, M., Bobbert, M., & Meschut, G. (n.d.). Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains. ESAFORM 2021, Lüttich. https://doi.org/10.25518/esaform21.4298","ama":"Bielak CR, Böhnke M, Bobbert M, Meschut G. Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains. doi:10.25518/esaform21.4298","short":"C.R. Bielak, M. Böhnke, M. Bobbert, G. Meschut, in: ESAFORM 2021, n.d.","mla":"Bielak, Christian Roman, et al. Further Development of a Numerical Method for Analyzing the Load Capacity of Clinched Joints in Versatile Process Chains. doi:10.25518/esaform21.4298.","bibtex":"@inproceedings{Bielak_Böhnke_Bobbert_Meschut, place={ESAFORM 2021}, title={Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains}, DOI={10.25518/esaform21.4298}, author={Bielak, Christian Roman and Böhnke, Max and Bobbert, Mathias and Meschut, Gerson} }"},"year":"2021","place":"ESAFORM 2021","date_created":"2020-12-21T08:15:27Z","author":[{"first_name":"Christian Roman","last_name":"Bielak","id":"34782","full_name":"Bielak, Christian Roman"},{"first_name":"Max","full_name":"Böhnke, Max","id":"45779","last_name":"Böhnke"},{"last_name":"Bobbert","id":"7850","full_name":"Bobbert, Mathias","first_name":"Mathias"},{"first_name":"Gerson","full_name":"Meschut, Gerson","id":"32056","orcid":"0000-0002-2763-1246","last_name":"Meschut"}],"date_updated":"2022-03-29T12:55:57Z","oa":"1","doi":"10.25518/esaform21.4298","conference":{"location":"Lüttich","end_date":"2021 04 16","start_date":"2021 04 14","name":"ESAFORM 2021"},"main_file_link":[{"open_access":"1","url":"https://popups.uliege.be/esaform21/index.php?id=3418"}],"title":"Further development of a numerical method for analyzing the load capacity of clinched joints in versatile process chains"},{"doi":"10.1088/1757-899X/1157/1/012077","title":"Data-driven analysis of cold-formed pin structure characteristics in the context of versatile joining processes","author":[{"first_name":"D.","last_name":"Römisch","full_name":"Römisch, D."},{"first_name":"C.","last_name":"Zirngibl","full_name":"Zirngibl, C."},{"first_name":"B.","last_name":"Schleich","full_name":"Schleich, B."},{"last_name":"Wartzack","full_name":"Wartzack, S.","first_name":"S."},{"first_name":"M.","last_name":"Merklein","full_name":"Merklein, M."}],"date_created":"2022-03-28T12:48:01Z","volume":1157,"date_updated":"2022-03-29T15:45:44Z","citation":{"apa":"Römisch, D., Zirngibl, C., Schleich, B., Wartzack, S., & Merklein, M. (2021). Data-driven analysis of cold-formed pin structure characteristics in the context of versatile joining processes. IOP Conference Series: Materials Science and Engineering, 1157, 012077. https://doi.org/10.1088/1757-899X/1157/1/012077","ama":"Römisch D, Zirngibl C, Schleich B, Wartzack S, Merklein M. Data-driven analysis of cold-formed pin structure characteristics in the context of versatile joining processes. IOP Conference Series: Materials Science and Engineering. 2021;1157:012077. doi:10.1088/1757-899X/1157/1/012077","mla":"Römisch, D., et al. “Data-Driven Analysis of Cold-Formed Pin Structure Characteristics in the Context of Versatile Joining Processes.” IOP Conference Series: Materials Science and Engineering, vol. 1157, 2021, p. 012077, doi:10.1088/1757-899X/1157/1/012077.","bibtex":"@article{Römisch_Zirngibl_Schleich_Wartzack_Merklein_2021, title={Data-driven analysis of cold-formed pin structure characteristics in the context of versatile joining processes}, volume={1157}, DOI={10.1088/1757-899X/1157/1/012077}, journal={IOP Conference Series: Materials Science and Engineering}, author={Römisch, D. and Zirngibl, C. and Schleich, B. and Wartzack, S. and Merklein, M.}, year={2021}, pages={012077} }","short":"D. Römisch, C. Zirngibl, B. Schleich, S. Wartzack, M. Merklein, IOP Conference Series: Materials Science and Engineering 1157 (2021) 012077.","chicago":"Römisch, D., C. Zirngibl, B. Schleich, S. Wartzack, and M. Merklein. “Data-Driven Analysis of Cold-Formed Pin Structure Characteristics in the Context of Versatile Joining Processes.” IOP Conference Series: Materials Science and Engineering 1157 (2021): 012077. https://doi.org/10.1088/1757-899X/1157/1/012077.","ieee":"D. Römisch, C. Zirngibl, B. Schleich, S. Wartzack, and M. Merklein, “Data-driven analysis of cold-formed pin structure characteristics in the context of versatile joining processes,” IOP Conference Series: Materials Science and Engineering, vol. 1157, p. 012077, 2021, doi: 10.1088/1757-899X/1157/1/012077."},"intvolume":" 1157","page":"012077","year":"2021","language":[{"iso":"eng"}],"user_id":"68518","project":[{"grant_number":"418701707","_id":"130","name":"TRR 285: TRR 285"},{"name":"TRR 285 - B: TRR 285 - Project Area B","_id":"132"},{"name":"TRR 285 – B05: TRR 285 - Subproject B05","_id":"144"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 – C01: TRR 285 - Subproject C01","_id":"145"}],"_id":"30650","status":"public","abstract":[{"lang":"eng","text":"Due to increasingly strict emission targets and regulatory requirements, especially for companies in the transport industry, the demand for multi-material-systems is continuously rising in order to lower energy consumption. In this context, mechanical joining processes offer an environmentally friendly and flexible alternative to established joining methods, especially in the field of lightweight design. For example, cold-formed cylindrical pin structures show high potentials in joining multi-material-systems without auxiliary elements. The pin structures are joined either by pressing them directly into the joining partner or by caulking with a pre-punched part. However, to evaluate the strength of the joint and to ensure the joining reliability for versatile processes, such as changing joining partners or batch variations, engineering designers currently have only limited design principles available compared to thermal joining processes. Consequently, the design of an optimal pin joint requires cost- and time-intensive experimental investigations and adjustments to design or process parameters. As a solution, data-driven methods offer procedures for structuring data and identifying dependencies between varying process parameters and resulting pin structure characteristics. Motivated by this, the paper presents an approach for the data-driven analysis of cold-formed pin structures and offers a deeper understanding of how versatile processes affect the pin characteristics. Therefore, the application of an intelligent design of experiment in combination with several machine learning methods enable the setup of a best-fitting meta-model. Resulting, the determination of a mathematical model provides the opportunity to accurately estimate the pin height considering only relevant geometrical and process parameters with a prediction quality of 95 %."}],"type":"journal_article","publication":"IOP Conference Series: Materials Science and Engineering"},{"year":"2021","intvolume":" 1157","page":"012003","citation":{"chicago":"Steinfelder, C., J. Kalich, A. Brosius, and U. Füssel. “Numerical and Experimental Investigation of the Transmission Moment of Clinching Points.” IOP Conference Series: Materials Science and Engineering 1157 (2021): 012003. https://doi.org/10.1088/1757-899x/1157/1/012003.","ieee":"C. Steinfelder, J. Kalich, A. Brosius, and U. Füssel, “Numerical and experimental investigation of the transmission moment of clinching points,” IOP Conference Series: Materials Science and Engineering, vol. 1157, p. 012003, 2021, doi: 10.1088/1757-899x/1157/1/012003.","ama":"Steinfelder C, Kalich J, Brosius A, Füssel U. Numerical and experimental investigation of the transmission moment of clinching points. IOP Conference Series: Materials Science and Engineering. 2021;1157:012003. doi:10.1088/1757-899x/1157/1/012003","apa":"Steinfelder, C., Kalich, J., Brosius, A., & Füssel, U. (2021). Numerical and experimental investigation of the transmission moment of clinching points. IOP Conference Series: Materials Science and Engineering, 1157, 012003. https://doi.org/10.1088/1757-899x/1157/1/012003","bibtex":"@article{Steinfelder_Kalich_Brosius_Füssel_2021, title={Numerical and experimental investigation of the transmission moment of clinching points}, volume={1157}, DOI={10.1088/1757-899x/1157/1/012003}, journal={IOP Conference Series: Materials Science and Engineering}, author={Steinfelder, C. and Kalich, J. and Brosius, A. and Füssel, U.}, year={2021}, pages={012003} }","short":"C. Steinfelder, J. Kalich, A. Brosius, U. Füssel, IOP Conference Series: Materials Science and Engineering 1157 (2021) 012003.","mla":"Steinfelder, C., et al. “Numerical and Experimental Investigation of the Transmission Moment of Clinching Points.” IOP Conference Series: Materials Science and Engineering, vol. 1157, 2021, p. 012003, doi:10.1088/1757-899x/1157/1/012003."},"title":"Numerical and experimental investigation of the transmission moment of clinching points","doi":"10.1088/1757-899x/1157/1/012003","date_updated":"2022-03-29T15:38:11Z","volume":1157,"author":[{"full_name":"Steinfelder, C.","last_name":"Steinfelder","first_name":"C."},{"first_name":"J.","last_name":"Kalich","full_name":"Kalich, J."},{"first_name":"A.","full_name":"Brosius, A.","last_name":"Brosius"},{"first_name":"U.","full_name":"Füssel, U.","last_name":"Füssel"}],"date_created":"2022-03-28T12:43:52Z","abstract":[{"text":"In clinching, the combinations of requirements, materials, component dimensions and tools influence the resulting joint geometry and the resulting bonding mechanisms. These in turn affect the property profile of the joint. For example, it is possible to use different tools to flexibly adapt clinching points to the respective required load regime. Clinching points dimensioned in this way can be geometrically similar, but have different mechanical stress states, which leads to different properties in terms of load-bearing behavior. Within the scope of this work, the clinching process with different tools in optimal and compromise design and its effect on the force and form-closure component, is investigated in a torsion test of the clinched connection. Clinched steel sheets with two thicknesses and joining directions are analyzed. Virtual experiments are carried out using finite element analyses (FEA) of the joining process and are followed by a springback simulation. Subsequently, the surface pressure between the two joining partners in the clinching points is calculated on the basis of the results from the FEA and the transmittable moment of the connection, as an indicator for the force-closure component, is determined. Finally, the experimental and simulated data are compared and discussed.","lang":"eng"}],"status":"public","publication":"IOP Conference Series: Materials Science and Engineering","type":"journal_article","language":[{"iso":"eng"}],"_id":"30648","project":[{"grant_number":"418701707","_id":"130","name":"TRR 285: TRR 285"},{"name":"TRR 285 - B: TRR 285 - Project Area B","_id":"132"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"_id":"138","name":"TRR 285 – A04: TRR 285 - Subproject A04"},{"name":"TRR 285 – B01: TRR 285 - Subproject B01","_id":"140"}],"user_id":"68518"},{"year":"2021","page":"951–972","intvolume":" 28","citation":{"apa":"Popp, J., Kleffel, T., Römisch, D., Papke, T., Merklein, M., & Drummer, D. (2021). Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins. Applied Composite Materials, 28, 951–972. https://doi.org/10.1007/s10443-021-09892-0","short":"J. Popp, T. Kleffel, D. Römisch, T. Papke, M. Merklein, D. Drummer, Applied Composite Materials 28 (2021) 951–972.","bibtex":"@article{Popp_Kleffel_Römisch_Papke_Merklein_Drummer_2021, title={Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins}, volume={28}, DOI={10.1007/s10443-021-09892-0}, journal={Applied Composite Materials}, author={Popp, J. and Kleffel, T. and Römisch, D. and Papke, T. and Merklein, M. and Drummer, D.}, year={2021}, pages={951–972} }","mla":"Popp, J., et al. “Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins.” Applied Composite Materials, vol. 28, 2021, pp. 951–972, doi:10.1007/s10443-021-09892-0.","ieee":"J. Popp, T. Kleffel, D. Römisch, T. Papke, M. Merklein, and D. Drummer, “Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins,” Applied Composite Materials, vol. 28, pp. 951–972, 2021, doi: 10.1007/s10443-021-09892-0.","chicago":"Popp, J., T. Kleffel, D. Römisch, T. Papke, M. Merklein, and D. Drummer. “Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins.” Applied Composite Materials 28 (2021): 951–972. https://doi.org/10.1007/s10443-021-09892-0.","ama":"Popp J, Kleffel T, Römisch D, Papke T, Merklein M, Drummer D. Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins. Applied Composite Materials. 2021;28:951–972. doi:10.1007/s10443-021-09892-0"},"title":"Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins","doi":"10.1007/s10443-021-09892-0","date_updated":"2022-03-29T15:50:53Z","volume":28,"date_created":"2022-03-28T12:53:14Z","author":[{"first_name":"J.","last_name":"Popp","full_name":"Popp, J."},{"full_name":"Kleffel, T.","last_name":"Kleffel","first_name":"T."},{"full_name":"Römisch, D.","last_name":"Römisch","first_name":"D."},{"first_name":"T.","last_name":"Papke","full_name":"Papke, T."},{"first_name":"M.","full_name":"Merklein, M.","last_name":"Merklein"},{"full_name":"Drummer, D.","last_name":"Drummer","first_name":"D."}],"abstract":[{"text":"Continuous Fiber Reinforced Thermoplastic (CFRT) hybrid parts offer interesting possibilities for lightweight application, which can exceed the capabilities of mono material metal or CFRT parts. In this case, the joining technology oftentimes is the limiting factor. This study investigates a joining operation with metal pin structures which are additively manufactured via powder bed fusion featuring different diameters and tip geometries, which are inserted into the locally infrared heated CFRT part. The resulting fiber rearrangement is assessed using transmitted light microscopy, confocal laser scanning microscopy as well as micro-computer-tomography. It could be shown that for all assessed pin variants a similar distinct fiber displacement can be seen and that the pin diameter has a significant effect on the resulting fiber orientation with smaller pin diameters being advantageous because of gentle fiber displacement and reduced undulation. The tip geometry has only minor effect on the fiber orientation. Especially in the X/Y plane no systematic influence of the tip geometry on the fiber displacement could be observed. Based on the gained insights a three-stage model of the fiber orientation processes is proposed.","lang":"eng"}],"status":"public","publication":"Applied Composite Materials","type":"journal_article","language":[{"iso":"eng"}],"_id":"30653","project":[{"grant_number":"418701707","name":"TRR 285: TRR 285","_id":"130"},{"_id":"133","name":"TRR 285 - C: TRR 285 - Project Area C"},{"name":"TRR 285 – C01: TRR 285 - Subproject C01","_id":"145"}],"user_id":"68518"},{"year":"2021","intvolume":" 14","page":"2286","citation":{"chicago":"Gröger, B., J. Troschitz, J. Vorderbrüggen, C. Vogel, R. Kupfer, G. Meschut, and M. Gude. “Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies.” Materials 14 (2021): 2286. https://doi.org/10.3390/ma14092286X.","ieee":"B. Gröger et al., “Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies,” Materials, vol. 14, p. 2286, 2021, doi: 10.3390/ma14092286X.","ama":"Gröger B, Troschitz J, Vorderbrüggen J, et al. Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies. Materials. 2021;14:2286. doi:10.3390/ma14092286X","mla":"Gröger, B., et al. “Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies.” Materials, vol. 14, 2021, p. 2286, doi:10.3390/ma14092286X.","short":"B. Gröger, J. Troschitz, J. Vorderbrüggen, C. Vogel, R. Kupfer, G. Meschut, M. Gude, Materials 14 (2021) 2286.","bibtex":"@article{Gröger_Troschitz_Vorderbrüggen_Vogel_Kupfer_Meschut_Gude_2021, title={Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies}, volume={14}, DOI={10.3390/ma14092286X}, journal={Materials}, author={Gröger, B. and Troschitz, J. and Vorderbrüggen, J. and Vogel, C. and Kupfer, R. and Meschut, G. and Gude, M.}, year={2021}, pages={2286} }","apa":"Gröger, B., Troschitz, J., Vorderbrüggen, J., Vogel, C., Kupfer, R., Meschut, G., & Gude, M. (2021). Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies. Materials, 14, 2286. https://doi.org/10.3390/ma14092286X"},"date_updated":"2022-03-29T15:48:59Z","volume":14,"date_created":"2022-03-28T12:51:22Z","author":[{"first_name":"B.","last_name":"Gröger","full_name":"Gröger, B."},{"full_name":"Troschitz, J.","last_name":"Troschitz","first_name":"J."},{"full_name":"Vorderbrüggen, J.","last_name":"Vorderbrüggen","first_name":"J."},{"full_name":"Vogel, C.","last_name":"Vogel","first_name":"C."},{"full_name":"Kupfer, R.","last_name":"Kupfer","first_name":"R."},{"first_name":"G.","full_name":"Meschut, G.","last_name":"Meschut"},{"full_name":"Gude, M.","last_name":"Gude","first_name":"M."}],"title":"Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies","doi":"10.3390/ma14092286X","publication":"Materials","type":"journal_article","abstract":[{"text":"Clinching continuous fibre reinforced thermoplastic composites and metals is challenging due to the low ductility of the composite material. Therefore, a number of novel clinching technologies has been developed specifically for these material combinations. A systematic overview of these advanced clinching methods is given in the present paper. With a focus on process design, three selected clinching methods suitable for different joining tasks are described in detail. The clinching processes including equipment and tools, observed process phenomena and the resultant material structure are compared. Process phenomena during joining are explained in general and compared using computed tomography and micrograph images for each process. In addition the load bearing behaviour and the corresponding failure mechanisms are investigated by means of single-lap shear tests. Finally, the new joining technologies are discussed regarding application relevant criteria.","lang":"eng"}],"status":"public","_id":"30652","project":[{"name":"TRR 285: TRR 285","_id":"130","grant_number":"418701707"},{"name":"TRR 285 - A: TRR 285 - Project Area A","_id":"131"},{"_id":"137","name":"TRR 285 – A03: TRR 285 - Subproject A03"}],"department":[{"_id":"157"}],"user_id":"68518","language":[{"iso":"eng"}]},{"citation":{"apa":"Busch, M., & Hausotte, T. (2021). Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks. Key Engineering Materials, 883, 41–48. https://doi.org/10.4028/www.scientific.net/kem.883.41","bibtex":"@article{Busch_Hausotte_2021, title={Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.41}, journal={Key Engineering Materials}, author={Busch, M. and Hausotte, T.}, year={2021}, pages={41–48} }","mla":"Busch, M., and T. Hausotte. “Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks.” Key Engineering Materials, vol. 883, 2021, pp. 41–48, doi:10.4028/www.scientific.net/kem.883.41.","short":"M. Busch, T. Hausotte, Key Engineering Materials 883 (2021) 41–48.","ama":"Busch M, Hausotte T. Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks. Key Engineering Materials. 2021;883:41-48. doi:10.4028/www.scientific.net/kem.883.41","chicago":"Busch, M., and T. Hausotte. “Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks.” Key Engineering Materials 883 (2021): 41–48. https://doi.org/10.4028/www.scientific.net/kem.883.41.","ieee":"M. Busch and T. Hausotte, “Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks,” Key Engineering Materials, vol. 883, pp. 41–48, 2021, doi: 10.4028/www.scientific.net/kem.883.41."},"page":"41-48","intvolume":" 883","year":"2021","date_created":"2022-03-28T13:58:55Z","author":[{"last_name":"Busch","full_name":"Busch, M.","first_name":"M."},{"first_name":"T.","full_name":"Hausotte, T.","last_name":"Hausotte"}],"volume":883,"date_updated":"2022-03-30T07:57:53Z","doi":"10.4028/www.scientific.net/kem.883.41","title":"Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks","type":"journal_article","publication":"Key Engineering Materials","status":"public","abstract":[{"lang":"eng","text":"Industrial X-ray computed tomography (XCT) is a tool for non-destructive testing and a volumetric analysis method with the ability to measure dimensions and geometry inside a component without destroying it. However, XCT is a relatively young technology in the field of dimensional metrology and thus faces several challenges. The achievement of a high measurement resolution, which is re-quired to detect small geometrical features, depends on a variety of influencing factors. In this arti-cle, the interface structural resolution (ISR) as one of the key challenges will be investigated. The two-sphere standard called the hourglass standard allows the determination of the structural resolu-tion by evaluation of the surrounding area of an ideal point contact of two spheres after the CT re-construction in form of a neck-shaped transition. Close to the contact point of the two spheres two opposing surfaces exist. Their distances from each other increase as the distance from the contact point of the two spheres increase. The determination of the distances between the spheres’ surface allows a statement about the ISR. A new developed specimen or standard with a variable gap size consisting of calibrated parallel gauge blocks allows statements about the ISR, too. Because of the higher number of probing points of the gauge block standard the results of the determined ISR are more stable compared to the hourglass standard. This paper compares the results of the computed tomography measurements for the designed interface structural resolution standard with those of the hourglass standard. "}],"user_id":"68518","project":[{"_id":"130","name":"TRR 285: TRR 285","grant_number":"418701707"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 – C05: TRR 285 - Subproject C05","_id":"149"}],"_id":"30662","language":[{"iso":"eng"}]},{"type":"conference","publication":"Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence","abstract":[{"lang":"eng","text":"Several algorithms for finding the best arm in the dueling bandits setting assume the existence of a Condorcet winner (CW), that is, an arm that uniformly dominates all other arms. Yet, by simply relying on this assumption but not verifying it, such algorithms may produce doubtful results in cases where it actually fails to hold. Even worse, the problem may not be noticed, and an alleged CW still be produced. In this paper, we therefore address the problem as a ”testification” task, by which we mean a combination of testing and identification: The online identification of the CW is combined with the statistical testing of the CW assumption. Thus, instead of returning a supposed CW at some point, the learner has the possibility to stop sampling and refuse an answer in case it feels confident that the CW assumption is violated. Analyzing the testification problem formally, we derive lower bounds on the expected sample complexity of any online algorithm solving it. Moreover, a concrete algorithm is proposed, which achieves the optimal sample complexity up to logarithmic terms."}],"editor":[{"first_name":"Cassio","full_name":"de Campos, Cassio","last_name":"de Campos"},{"full_name":"Maathuis, Marloes H.","last_name":"Maathuis","first_name":"Marloes H."}],"status":"public","_id":"30725","user_id":"38261","series_title":"Proceedings of Machine Learning Research","language":[{"iso":"eng"}],"year":"2021","citation":{"chicago":"Haddenhorst, Björn, Viktor Bengs, Jasmin Brandt, and Eyke Hüllermeier. “Testification of Condorcet Winners in Dueling Bandits.” In Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence, edited by Cassio de Campos and Marloes H. Maathuis, 161:1195–1205. Proceedings of Machine Learning Research. PMLR, 2021.","ieee":"B. Haddenhorst, V. Bengs, J. Brandt, and E. Hüllermeier, “Testification of Condorcet Winners in dueling bandits,” in Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence, 2021, vol. 161, pp. 1195–1205.","ama":"Haddenhorst B, Bengs V, Brandt J, Hüllermeier E. Testification of Condorcet Winners in dueling bandits. In: de Campos C, Maathuis MH, eds. Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence. Vol 161. Proceedings of Machine Learning Research. PMLR; 2021:1195–1205.","short":"B. Haddenhorst, V. Bengs, J. Brandt, E. Hüllermeier, in: C. de Campos, M.H. Maathuis (Eds.), Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence, PMLR, 2021, pp. 1195–1205.","bibtex":"@inproceedings{Haddenhorst_Bengs_Brandt_Hüllermeier_2021, series={Proceedings of Machine Learning Research}, title={Testification of Condorcet Winners in dueling bandits}, volume={161}, booktitle={Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence}, publisher={PMLR}, author={Haddenhorst, Björn and Bengs, Viktor and Brandt, Jasmin and Hüllermeier, Eyke}, editor={de Campos, Cassio and Maathuis, Marloes H.}, year={2021}, pages={1195–1205}, collection={Proceedings of Machine Learning Research} }","mla":"Haddenhorst, Björn, et al. “Testification of Condorcet Winners in Dueling Bandits.” Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence, edited by Cassio de Campos and Marloes H. Maathuis, vol. 161, PMLR, 2021, pp. 1195–1205.","apa":"Haddenhorst, B., Bengs, V., Brandt, J., & Hüllermeier, E. (2021). Testification of Condorcet Winners in dueling bandits. In C. de Campos & M. H. Maathuis (Eds.), Proceedings of the Thirty-Seventh Conference on Uncertainty in Artificial Intelligence (Vol. 161, pp. 1195–1205). PMLR."},"page":"1195–1205","intvolume":" 161","publisher":"PMLR","date_updated":"2022-03-30T06:15:49Z","author":[{"full_name":"Haddenhorst, Björn","last_name":"Haddenhorst","first_name":"Björn"},{"first_name":"Viktor","full_name":"Bengs, Viktor","last_name":"Bengs"},{"full_name":"Brandt, Jasmin","last_name":"Brandt","first_name":"Jasmin"},{"first_name":"Eyke","last_name":"Hüllermeier","full_name":"Hüllermeier, Eyke"}],"date_created":"2022-03-30T06:14:16Z","volume":161,"title":"Testification of Condorcet Winners in dueling bandits"},{"status":"public","abstract":[{"text":"In lightweight design, clinching is a cost-efficient solution as the joint is created through localized cold-forming of the joining parts. A clinch point’s quality is usually assessed using ex-situ destructive testing methods. These, however, are unable to detect phenomena immediately during the joining process. For instance, elastic deformations reverse and cracks close after unloading. In-situ methods such as the force-displacement evaluation are used to control a clinching process, though deviations in the clinch point geometry cannot be derived with this method. To overcome these limitations, the clinching process can be investigated using in-situ computed tomography (in-situ CT). However, a clinching tool made of steel would cause strong artefacts and a high attenuation in the CT measurement, reducing the significance of this method. Additionally, when joining parts of the same material, the sheet-sheet interface is hardly detectable. This work aims at identifying, firstly, tool materials that allow artefact-reduced CT measurements during clinching, and, secondly, radiopaque materials that can be applied between the joining parts to enhance the detectability of the sheet-sheet interface. Therefore, both CT-suitable tool materials and radiopaque materials are selected and experimentally investigated. In the clinching process, two aluminium sheets with radiopaque material in between are clinched in a single-step (rotationally symmetric joint without cut section). It is shown that e.g. silicon nitride is suited as tool material and a tin layer is suitable to enhance the detectability of the sheet-sheet interface. ","lang":"eng"}],"publication":"ESAFORM 2021","type":"journal_article","language":[{"iso":"eng"}],"user_id":"68518","_id":"30659","project":[{"name":"TRR 285: TRR 285","_id":"130","grant_number":"418701707"},{"_id":"133","name":"TRR 285 - C: TRR 285 - Project Area C"},{"_id":"148","name":"TRR 285 – C04: TRR 285 - Subproject C04"}],"citation":{"apa":"Köhler, D., Kupfer, R., Troschitz, J., & Gude, M. (2021). Clinching in In-situ CT – Experimental Study on Suitable Tool Materials. ESAFORM 2021. https://doi.org/10.25518/esaform21.2781","bibtex":"@article{Köhler_Kupfer_Troschitz_Gude_2021, title={Clinching in In-situ CT – Experimental Study on Suitable Tool Materials}, DOI={10.25518/esaform21.2781}, journal={ESAFORM 2021}, author={Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}, year={2021} }","short":"D. Köhler, R. Kupfer, J. Troschitz, M. Gude, ESAFORM 2021 (2021).","mla":"Köhler, D., et al. “Clinching in In-Situ CT – Experimental Study on Suitable Tool Materials.” ESAFORM 2021, 2021, doi:10.25518/esaform21.2781.","ama":"Köhler D, Kupfer R, Troschitz J, Gude M. Clinching in In-situ CT – Experimental Study on Suitable Tool Materials. ESAFORM 2021. Published online 2021. doi:10.25518/esaform21.2781","ieee":"D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “Clinching in In-situ CT – Experimental Study on Suitable Tool Materials,” ESAFORM 2021, 2021, doi: 10.25518/esaform21.2781.","chicago":"Köhler, D., R. Kupfer, J. Troschitz, and M. Gude. “Clinching in In-Situ CT – Experimental Study on Suitable Tool Materials.” ESAFORM 2021, 2021. https://doi.org/10.25518/esaform21.2781."},"year":"2021","doi":"10.25518/esaform21.2781","title":"Clinching in In-situ CT – Experimental Study on Suitable Tool Materials","author":[{"first_name":"D.","full_name":"Köhler, D.","last_name":"Köhler"},{"last_name":"Kupfer","full_name":"Kupfer, R.","first_name":"R."},{"last_name":"Troschitz","full_name":"Troschitz, J.","first_name":"J."},{"first_name":"M.","last_name":"Gude","full_name":"Gude, M."}],"date_created":"2022-03-28T13:39:26Z","date_updated":"2022-03-29T15:53:46Z"},{"user_id":"68518","project":[{"grant_number":"418701707","name":"TRR 285: TRR 285","_id":"130"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"_id":"148","name":"TRR 285 – C04: TRR 285 - Subproject C04"}],"_id":"30661","language":[{"iso":"eng"}],"type":"journal_article","publication":"Materials","status":"public","abstract":[{"text":"As lightweight design gains more and more attention, time and cost-efficient joining methods such as clinching are becoming more popular. A clinch point’s quality is usually determined by ex situ destructive analyses such as microsectioning. However, these methods do not yield the detection of phenomena occurring during loading such as elastic deformations and cracks that close after unloading. Alternatively, in situ computed tomography (in situ CT) can be used to investigate the loading process of clinch points. In this paper, a method for in situ CT analysis of a single-lap shear test with clinched metal sheets is presented at the example of a clinched joint with two 2 mm thick aluminum sheets. Furthermore, the potential of this method to validate numerical simulations is shown. Since the sheets’ surfaces are locally in contact with each other, the interface between both aluminum sheets and therefore the exact contour of the joining partners is difficult to identify in CT analyses. To compensate for this, the application of copper varnish between the sheets is investigated. The best in situ CT results are achieved with both sheets treated. It showed that with this treatment, in situ CT is suitable to properly observe the three-dimensional deformation behavior and to identify the failure modes.","lang":"eng"}],"author":[{"first_name":"D.","full_name":"Köhler, D.","last_name":"Köhler"},{"first_name":"R.","full_name":"Kupfer, R.","last_name":"Kupfer"},{"first_name":"J.","last_name":"Troschitz","full_name":"Troschitz, J."},{"first_name":"M.","last_name":"Gude","full_name":"Gude, M."}],"date_created":"2022-03-28T13:41:29Z","volume":14,"date_updated":"2022-03-30T07:53:37Z","doi":"10.3390/ma14081859","title":"In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points","citation":{"chicago":"Köhler, D., R. Kupfer, J. Troschitz, and M. Gude. “In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points.” Materials 14 (2021): 1859. https://doi.org/10.3390/ma14081859.","ieee":"D. Köhler, R. Kupfer, J. Troschitz, and M. Gude, “In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points,” Materials, vol. 14, p. 1859, 2021, doi: 10.3390/ma14081859.","ama":"Köhler D, Kupfer R, Troschitz J, Gude M. In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points. Materials. 2021;14:1859. doi:10.3390/ma14081859","mla":"Köhler, D., et al. “In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points.” Materials, vol. 14, 2021, p. 1859, doi:10.3390/ma14081859.","short":"D. Köhler, R. Kupfer, J. Troschitz, M. Gude, Materials 14 (2021) 1859.","bibtex":"@article{Köhler_Kupfer_Troschitz_Gude_2021, title={In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points}, volume={14}, DOI={10.3390/ma14081859}, journal={Materials}, author={Köhler, D. and Kupfer, R. and Troschitz, J. and Gude, M.}, year={2021}, pages={1859} }","apa":"Köhler, D., Kupfer, R., Troschitz, J., & Gude, M. (2021). In Situ Computed Tomography—Analysis of a Single-Lap Shear Test with Clinch Points. Materials, 14, 1859. https://doi.org/10.3390/ma14081859"},"page":"1859","intvolume":" 14","year":"2021"},{"language":[{"iso":"eng"}],"project":[{"grant_number":"418701707","_id":"130","name":"TRR 285: TRR 285"},{"name":"TRR 285 - C: TRR 285 - Project Area C","_id":"133"},{"name":"TRR 285 – C02: TRR 285 - Subproject C02","_id":"146"}],"_id":"30719","user_id":"68518","abstract":[{"lang":"eng","text":"Due to increasing demands regarding ecological and economic specifications in vehicle design, the effort required for production is continuously increasing. One trend is the increased use of multi-material systems, which are characterised by the use of different materials such as high-strength steels or aluminium alloys. In addition to the varying mechanical properties of the components, an increased number of variants accompanied by different geometries is leading to increasing challenges on body construction. For the assembly and connection of the individual components, conventional joining methods reach their limitations. Therefore, new joining methods are necessary, which feature properties of versatility and can adapt to process and disturbance variables. One way of achieving tailored joints is to use a tumbling self-piercing riveting process. For the design of the process route, numerical investigations are necessary for which a characterisation of the friction properties is necessary. This paper therefore investigates the contact and friction conditions that occur in a tumbling self-piercing riveting process. The individual contacts between the process components are identified and based on this, suitable processes for the characterisation of the friction factors - and coefficients are selected and performed."}],"status":"public","type":"journal_article","publication":"Key Engineering Materials","title":"Friction Characterisation for a Tumbling Self-Piercing Riveting Process","doi":"10.4028/www.scientific.net/kem.883.27","date_updated":"2022-03-29T15:54:33Z","author":[{"first_name":"S.","full_name":"Wituschek, S.","last_name":"Wituschek"},{"first_name":"M.","full_name":"Lechner, M.","last_name":"Lechner"}],"date_created":"2022-03-29T10:35:19Z","volume":883,"year":"2021","citation":{"apa":"Wituschek, S., & Lechner, M. (2021). Friction Characterisation for a Tumbling Self-Piercing Riveting Process. Key Engineering Materials, 883, 27–34. https://doi.org/10.4028/www.scientific.net/kem.883.27","mla":"Wituschek, S., and M. Lechner. “Friction Characterisation for a Tumbling Self-Piercing Riveting Process.” Key Engineering Materials, vol. 883, 2021, pp. 27–34, doi:10.4028/www.scientific.net/kem.883.27.","short":"S. Wituschek, M. Lechner, Key Engineering Materials 883 (2021) 27–34.","bibtex":"@article{Wituschek_Lechner_2021, title={Friction Characterisation for a Tumbling Self-Piercing Riveting Process}, volume={883}, DOI={10.4028/www.scientific.net/kem.883.27}, journal={Key Engineering Materials}, author={Wituschek, S. and Lechner, M.}, year={2021}, pages={27–34} }","chicago":"Wituschek, S., and M. Lechner. “Friction Characterisation for a Tumbling Self-Piercing Riveting Process.” Key Engineering Materials 883 (2021): 27–34. https://doi.org/10.4028/www.scientific.net/kem.883.27.","ieee":"S. Wituschek and M. Lechner, “Friction Characterisation for a Tumbling Self-Piercing Riveting Process,” Key Engineering Materials, vol. 883, pp. 27–34, 2021, doi: 10.4028/www.scientific.net/kem.883.27.","ama":"Wituschek S, Lechner M. Friction Characterisation for a Tumbling Self-Piercing Riveting Process. Key Engineering Materials. 2021;883:27-34. doi:10.4028/www.scientific.net/kem.883.27"},"page":"27-34","intvolume":" 883"},{"_id":"30723","user_id":"38261","language":[{"iso":"eng"}],"publication":"Advances in Neural Information Processing Systems","type":"conference","editor":[{"last_name":"Beygelzimer","full_name":"Beygelzimer, A.","first_name":"A."},{"full_name":"Dauphin, Y.","last_name":"Dauphin","first_name":"Y."},{"first_name":"P.","last_name":"Liang","full_name":"Liang, P."},{"first_name":"J. Wortman","last_name":"Vaughan","full_name":"Vaughan, J. Wortman"}],"status":"public","date_updated":"2022-03-30T06:15:53Z","author":[{"first_name":"Björn","last_name":"Haddenhorst","full_name":"Haddenhorst, Björn"},{"first_name":"Viktor","last_name":"Bengs","full_name":"Bengs, Viktor"},{"full_name":"Hüllermeier, Eyke","last_name":"Hüllermeier","first_name":"Eyke"}],"date_created":"2022-03-30T06:11:16Z","title":"Identification of the Generalized Condorcet Winner in Multi-dueling Bandits","year":"2021","citation":{"ama":"Haddenhorst B, Bengs V, Hüllermeier E. Identification of the Generalized Condorcet Winner in Multi-dueling Bandits. In: Beygelzimer A, Dauphin Y, Liang P, Vaughan JW, eds. Advances in Neural Information Processing Systems. ; 2021.","chicago":"Haddenhorst, Björn, Viktor Bengs, and Eyke Hüllermeier. “Identification of the Generalized Condorcet Winner in Multi-Dueling Bandits.” In Advances in Neural Information Processing Systems, edited by A. Beygelzimer, Y. Dauphin, P. Liang, and J. Wortman Vaughan, 2021.","ieee":"B. Haddenhorst, V. Bengs, and E. Hüllermeier, “Identification of the Generalized Condorcet Winner in Multi-dueling Bandits,” in Advances in Neural Information Processing Systems, 2021.","apa":"Haddenhorst, B., Bengs, V., & Hüllermeier, E. (2021). Identification of the Generalized Condorcet Winner in Multi-dueling Bandits. In A. Beygelzimer, Y. Dauphin, P. Liang, & J. W. Vaughan (Eds.), Advances in Neural Information Processing Systems.","mla":"Haddenhorst, Björn, et al. “Identification of the Generalized Condorcet Winner in Multi-Dueling Bandits.” Advances in Neural Information Processing Systems, edited by A. Beygelzimer et al., 2021.","short":"B. Haddenhorst, V. Bengs, E. Hüllermeier, in: A. Beygelzimer, Y. Dauphin, P. Liang, J.W. Vaughan (Eds.), Advances in Neural Information Processing Systems, 2021.","bibtex":"@inproceedings{Haddenhorst_Bengs_Hüllermeier_2021, title={Identification of the Generalized Condorcet Winner in Multi-dueling Bandits}, booktitle={Advances in Neural Information Processing Systems}, author={Haddenhorst, Björn and Bengs, Viktor and Hüllermeier, Eyke}, editor={Beygelzimer, A. and Dauphin, Y. and Liang, P. and Vaughan, J. Wortman}, year={2021} }"}},{"language":[{"iso":"ger"}],"_id":"17751","department":[{"_id":"520"}],"user_id":"59882","status":"public","publication":"Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität","type":"encyclopedia_article","title":"Technikphilosophie","publisher":"Herder Verlag","date_updated":"2022-04-04T08:24:42Z","author":[{"last_name":"Peckhaus","id":"391","full_name":"Peckhaus, Volker","first_name":"Volker"}],"date_created":"2020-08-10T07:33:11Z","year":"2021","place":"Freiburg/Basel/Wien","page":"983-991 (Spalten)","citation":{"bibtex":"@inbook{Peckhaus_2021, place={Freiburg/Basel/Wien}, edition={8. völlig neu bearbeitete Aufl.}, title={Technikphilosophie}, booktitle={Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität}, publisher={Herder Verlag}, author={Peckhaus, Volker}, year={2021}, pages={983-991 (Spalten)} }","short":"V. Peckhaus, in: Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität, 8. völlig neu bearbeitete Aufl., Herder Verlag, Freiburg/Basel/Wien, 2021, pp. 983-991 (Spalten).","mla":"Peckhaus, Volker. “Technikphilosophie.” Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität, 8. völlig neu bearbeitete Aufl., Herder Verlag, 2021, pp. 983-991 (Spalten).","apa":"Peckhaus, V. (2021). Technikphilosophie. In Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität (8. völlig neu bearbeitete Aufl., pp. 983-991 (Spalten)). Herder Verlag.","ieee":"V. Peckhaus, “Technikphilosophie,” in Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität, 8. völlig neu bearbeitete Aufl., Freiburg/Basel/Wien: Herder Verlag, 2021, pp. 983-991 (Spalten).","chicago":"Peckhaus, Volker. “Technikphilosophie.” In Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität, 8. völlig neu bearbeitete Aufl., 983-991 (Spalten). Freiburg/Basel/Wien: Herder Verlag, 2021.","ama":"Peckhaus V. Technikphilosophie. In: Staatslexikon. Recht, Wirtschaft, Gesellschaft, Bd. 5: Schule - Virtuelle Realität. 8. völlig neu bearbeitete Aufl. Herder Verlag; 2021:983-991 (Spalten)."},"publication_status":"published","edition":"8. völlig neu bearbeitete Aufl."}]