@article{34414,
abstract = {{Given a steadily increasing demand on multi-material lightweight designs, fast and cost-efficient production technologies, such as the mechanical joining process clinching, are becoming more and more relevant for series production. Since the application of such joining techniques often base on the ability to reach similar or even better joint loading capacities compared to established joining processes (e.g., spot welding), few contributions investigated the systematic improvement of clinch joint characteristics. In this regard, the use of data-driven methods in combination with optimization algorithms showed already high potentials for the analysis of individual joints and the definition of optimal tool configurations. However, the often missing consideration of uncertainties, such as varying material properties, and the related calculation of their impact on clinch joint properties can lead to poor estimation results and thus to a decreased reliability of the entire joint connection. This can cause major challenges, especially for the design and dimensioning of safety-relevant components, such as in car bodies. Motivated by this, the presented contribution introduces a novel method for the robust estimation of clinch joint characteristics including uncertainties of varying and versatile process chains in mechanical joining. Therefore, the utilization of Gaussian process regression models is demonstrated and evaluated regarding the ability to achieve sufficient prediction qualities.}},
author = {{Zirngibl, Christoph and Schleich, Benjamin and Wartzack, Sandro}},
issn = {{0268-3768}},
journal = {{The International Journal of Advanced Manufacturing Technology}},
keywords = {{Industrial and Manufacturing Engineering, Computer Science Applications, Mechanical Engineering, Software, Control and Systems Engineering}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Robust estimation of clinch joint characteristics based on data-driven methods}}},
doi = {{10.1007/s00170-022-10441-7}},
year = {{2022}},
}
@article{34261,
abstract = {{Mechanical clinching is used to create lightweight hybrid structures. In order to estimate the service life of clinched components, its fatigue properties need to be known under different mechanical loading conditions. In addition to fatigue, corrosion is another factor that affects the fatigue life of clinched joints. In the literature, many corrosion and high-cycle fatigue damage models exist. However, little is known about how both phenomena interact in clinched joints. In this article, the influence of galvanic corrosion on clinched EN AW-6014/HCT590X + Z sheets on the fatigue life is investigated by means of numerical simulations and experimental results. An accurate prediction of the Wöhler lines of non-corroded and pre-corroded clinched specimens is shown.}},
author = {{Harzheim, Sven and Hofmann, Martin and Wallmersperger, Thomas}},
issn = {{1537-6494}},
journal = {{Mechanics of Advanced Materials and Structures}},
keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science, General Mathematics, Civil and Structural Engineering}},
pages = {{1--6}},
publisher = {{Informa UK Limited}},
title = {{{Numerical fatigue life prediction of corroded and non-corroded clinched joints}}},
doi = {{10.1080/15376494.2022.2140233}},
year = {{2022}},
}
@phdthesis{35189,
abstract = {{The development of new business models is essential for startups to become successful, as well as for established companies to explore new business opportunities. However, developing such business models is a challenging activity. On the one hand, various tasks of business model development methods (BMDMs) need to be performed. On the other hand, different decisions for the business models (BMs) need to be made. Both have to fit the changeable situation of the organization in which the business model is developed to reduce the risk of developing ineffective business models with low market penetration. Therefore, the BMDMs and the BMs must be developed situation-specific. In this thesis, we conduct a design science research study to design a novel approach for the situation-specific development of business models with three stages. In the first stage, we create a method repository with method fragments for the BMDMs and a canvas model repository with modeling fragments for the BMs. Both repositories are filled by the knowledge of domain experts. Out of these repositories, in the second stage, situation-specific BMDMs for developing situation-specific BMs are composed by a method engineer based on the changeable situation of the organization and enacted by a business developer. The business developer collaborates with other stakeholders during the enaction to create artifacts. Moreover, in the third stage, he receives IT support, provided by development support engineers, in different development steps.}},
author = {{Gottschalk, Sebastian}},
publisher = {{Paderborn University}},
title = {{{Situation-specific Development of Business Models within Software Ecosystems}}},
doi = {{10.17619/UNIPB/1-1644}},
year = {{2022}},
}
@article{33862,
author = {{Moritzer, Elmar and Driediger, Christine}},
journal = {{Macromolecular Symposia}},
location = {{Bukarest}},
number = {{1}},
publisher = {{Wiley}},
title = {{{Reactive Direct Bonding of Digital Light Process Components}}},
doi = {{https://doi.org/10.1002/masy.202100396}},
volume = {{404}},
year = {{2022}},
}
@techreport{36227,
author = {{Hammer, Barbara and Hüllermeier, Eyke and Lohweg, Volker and Schneider, Alexander and Schenck, Wolfram and Kuhl, Ulrike and Braun, Marco and Pfeifer, Anton and Holst, Christoph-Alexander and Schmidt, Malte and Schomaker, Gunnar and Tornede, Tanja}},
title = {{{Schlussbericht ITS.ML: Intelligente Technische Systeme der nächsten Generation durch Maschinelles Lernen. Forschungsvorhaben zur automatisierten Analyse von Daten mittels Maschinellen Lernens}}},
doi = {{10.4119/unibi/2965622}},
year = {{2022}},
}
@inbook{33466,
abstract = {{We review our results of numerical simulations of light scattering from different systems of densely packed irregular particles. We consider spherical clusters, thick layers and monolayers with realistic topologies and dimensions much larger than the wavelength of light. The maximum bulk packing density of clusters is 0.5. A numerically exact solution of the electromagnetic problem is obtained using the Discontinuous Galerkin Time Domain method and with application of high- performance computing. We show that high packing density causes light localization in such structures which makes an impact on the opposition phenomena: backscattering intensity surge and negative linear polarization feature. Diffuse multiple scattering is significantly reduced in the case of non-absorbing particles and near-field interaction results in a percolation-like light transport determined by the topology of the medium. With this the negative polarization feature caused by single scattering gets enhanced if compared to lower density samples. We also confirm coherent double scattering mechanism of negative polarization for light scattered from dense absorbing slabs. In this case convergent result for the scattering angle polarization dependency at backscattering can be obtained for a layer of just a few tens of particles if they are larger than the wavelength.}},
author = {{Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}},
booktitle = {{Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media}},
editor = {{Kokhanovsky, Alexander}},
isbn = {{9783031102974}},
issn = {{2509-2790}},
keywords = {{tet_topic_scattering}},
publisher = {{Springer International Publishing}},
title = {{{Light Scattering by Large Densely Packed Clusters of Particles}}},
doi = {{10.1007/978-3-031-10298-1_4}},
volume = {{8}},
year = {{2022}},
}
@inproceedings{36462,
abstract = {{The conduction of structure-borne sound through joints causes energy dissipation. The sound reduction index describes this energy loss as a level decrease in the particle velocity across series-connected damping elements for which the superposition principle applies. This simple model can help to develop a testing method for joints based on this characteristic energy loss. In this paper, this model is experimentally evaluated for multiple in-series clinched aluminium sheets. Samples connected by several clinch points arranged in parallel are investigated experimentally, and the results are discussed.}},
author = {{Stephan, Richard and Brosius, Alexander}},
booktitle = {{The 28th Saxon Conference on Forming Technology SFU and the 7th International Conference on Accuracy in Forming Technology ICAFT}},
keywords = {{clinching, mechanical joining, damping, model, evaluation, dynamics}},
publisher = {{MDPI}},
title = {{{Experimental Measurement Method and Evaluation of an Analytical Approach for Sound Conduction through Multiple Clinched Sheets}}},
doi = {{10.3390/engproc2022026025}},
year = {{2022}},
}
@inproceedings{36468,
author = {{Römisch, David and Merklein, Marion}},
location = {{Örebro}},
title = {{{Experimental and Numerical Analysis of Cold Formed Multi Pin Structures Using a Multi-Acting Tool Design}}},
year = {{2022}},
}
@inproceedings{36470,
author = {{Wituschek, Simon and Lechner, Michael}},
title = {{{Versatile tool design for a tumbling self-piercing riveting process}}},
year = {{2022}},
}
@inproceedings{36473,
abstract = {{Destructive micrograph analysis (MA) is the standard method for the assessment of clinched joints. However, during the joint preparation for the MA, geometric features of the joint can change due to elastic effects and closing cracks. X-ray computed tomography (CT) is a promising alternative to investigate the joint non-destructively. However, if the
material properties of similar joining partners are the same, the CT is not able to correctly resolve surfaces in the joint that are close to or pressing onto each other. These surfaces are relevant for the determination of characteristic dimensions such as neck thickness and undercut. By placing a thin, highly radiopaque tin layer between the joining partners, the interfacial area in the reconstructed volume can be highlighted. In this work, a method for the localisation of the tin layer inside the joint as well as threshold value procedures for the outer joint contour in cross section images are investigated. The measured characteristic dimensions are compared with measured values from MA of the same samples and of samples without tin layer. In addition, possible effects of the tin layer on the joining point
characteristics as well as problems of the MA are discussed.}},
author = {{Busch, Matthias and Köhler, Daniel and Hausotte, Tino and Kupfer, Robert and Troschitz, Juliane and Gude, Maik }},
title = {{{Approach to Determine the Characteristic Dimensions of Clinched Joints by Industrial X-ray Computed Tomography}}},
year = {{2022}},
}
@inproceedings{33696,
author = {{Wiechmann, Jana and Glarner, Thomas and Rautenberg, Frederik and Wagner, Petra and Haeb-Umbach, Reinhold}},
booktitle = {{18. Phonetik und Phonologie im deutschsprachigen Raum (P&P)}},
location = {{Bielefeld}},
title = {{{Technically enabled explaining of voice characteristics}}},
year = {{2022}},
}
@misc{35901,
author = {{Böttger, Lydia}},
booktitle = {{www.daz-portal.de}},
title = {{{Lydia Böttger (Universität Paderborn) rezensiert: Michalak, Magdalena; Döll, Marion (Hrsg.) (2021): Lehrwerke und Lehrmaterialien im Kontext des Deutschen als Zweitsprache und der sprachlichen Bildung. [Deutsch als Zweitsprache Positionen, Perspektiven, Potenziale, Bd. 2]. Münster, New York: Waxmann, 164 Seiten. ISBN 978-3-8309-4105-7.}}},
year = {{2022}},
}
@inproceedings{30883,
author = {{Krings, Sarah Claudia and Yigitbas, Enes and Biermeier, Kai and Engels, Gregor}},
booktitle = {{Proceedings of the 14th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2022)}},
title = {{{Design and Evaluation of AR-Assisted End-User Robot Path Planning Strategies}}},
year = {{2022}},
}
@inproceedings{34001,
author = {{Arian, Bahman and Homberg, Werner and Kersting, Lukas and Trächtler, Ansgar and Rozo Vasquez, Julian}},
booktitle = {{36. Aachener Stahlkolloquium – Umformtechnik “Ideen Form geben“}},
isbn = {{978-3-95886-460-3}},
pages = {{333--347}},
title = {{{Produktkennzeichnung durch lokal definierte Einstellung von ferromagnetischen Eigenschaften beim Drückwalzen von metastabilen Stahlwerkstoffen}}},
year = {{2022}},
}
@inproceedings{34003,
author = {{Arian, Bahman and Oesterwinter, Annika and Homberg, Werner and Rozo Vasquez, Julian and Walther, Frank and Kersting, Lukas and Trächtler, Ansgar}},
booktitle = {{19th Int. Conference on Metal Forming 2022}},
title = {{{A flow forming process model to predict workpiece properties in AISI 304L}}},
year = {{2022}},
}
@inproceedings{33852,
author = {{Moritzer, Elmar and Hecker, Felix}},
booktitle = {{Proceedings of the 33rd Annual Freeform Fabrication Symposium}},
editor = {{Bourell, David L. and Beaman, Joseph J. and Crawford, Richard H. and Kovar, Desiderio and Seepersad, Carolyn C. and Tehrani, Mehran}},
location = {{Austin, Texas, USA}},
pages = {{2011--2018}},
title = {{{VALIDATION AND COMPARISON OF FEM-SIMULATION RESULTS OF THE FUSED DEPOSITION MODELING PROCESS UNDER CONSIDERATION OF DIFFERENT MESH RESOLUTIONS}}},
doi = {{10.26153/tsw/44657}},
year = {{2022}},
}
@inproceedings{30220,
abstract = {{In this work, the influences of spherical fillers on the processing properties and the resulting mechanical properties of laser sintered components are investigated. For this purpose, micro glass spheres, hollow glass bubbles and mineral spheres are dry blended to the matrix polymers polyamide 613 and polypropylene with a filling ratio of 20 and 40 vol%. First, relevant properties of the blends, such as powder flowability, thermal behavior and melt viscosity, are investigated. Based on the results, processing parameters are then developed for the LS process and the mechanical properties of the components are investigated. The aim is to be able to tailor the mechanical properties of LS components by adding fillers and thus to create new application areas for additively manufactured components. }},
author = {{Kletetzka, Ivo and Gawlikowicz, Roland and Schmid, Hans-Joachim}},
booktitle = {{Proceedings of the 33th Annual International Solid Freeform Fabrication Symposium}},
location = {{Austin}},
publisher = {{Laboratory for Freeform Fabrication and University of Texas}},
title = {{{Effects of spherical fillers on the processability and mechanical properties of PA613 and PP-based LS dry blends}}},
doi = {{http://dx.doi.org/10.26153/tsw/44558}},
volume = {{33}},
year = {{2022}},
}
@inproceedings{32874,
author = {{Kletetzka, Ivo and Klippstein, Sven Helge and Schmid, Hans-Joachim}},
booktitle = {{Proceedings of the 33th Annual International Solid Freeform Fabrication Symposium}},
location = {{Austin}},
publisher = {{Laboratory for Freeform Fabrication and University of Texas}},
title = {{{Shelf Life of Polyamide 12 (PA2200) Laser Sintering Powder}}},
doi = {{http://dx.doi.org/10.26153/tsw/44555}},
volume = {{33}},
year = {{2022}},
}
@inproceedings{33853,
author = {{Moritzer, Elmar and Hecker, Felix}},
booktitle = {{Proceedings of the 33rd Annual Freeform Fabrication Symposium}},
editor = {{Bourell, David L. and Beaman, Joseph J. and Crawford, Richard H. and Kovar, Desiderio and Seepersad, Carolyn C. and Tehrani, Mehran}},
location = {{Austin, Texas, USA}},
pages = {{1844--1858}},
title = {{{INVESTIGATION OF THE PROCESS PARAMETERS AND GEOMETRY DEPENDENT SHRINKAGE BEHAVIOR OF RASTER LINES IN THE FUSED DEPOSITION MODELING PROCESS}}},
doi = {{10.26153/tsw/44654}},
year = {{2022}},
}
@article{51348,
abstract = {{AbstractWith the perspective on applications of AI-technology, especially data intensive deep learning approaches, the need for methods to control and understand such models has been recognized and gave rise to a new research domain labeled explainable artificial intelligence (XAI). In this overview paper we give an interim appraisal of what has been achieved so far and where there are still gaps in the research. We take an interdisciplinary perspective to identify challenges on XAI research and point to open questions with respect to the quality of the explanations regarding faithfulness and consistency of explanations. On the other hand we see a need regarding the interaction between XAI and user to allow for adaptability to specific information needs and explanatory dialog for informed decision making as well as the possibility to correct models and explanations by interaction. This endeavor requires an integrated interdisciplinary perspective and rigorous approaches to empirical evaluation based on psychological, linguistic and even sociological theories.}},
author = {{Schmid, Ute and Wrede, Britta}},
issn = {{0933-1875}},
journal = {{KI - Künstliche Intelligenz}},
keywords = {{Artificial Intelligence}},
number = {{3-4}},
pages = {{303--315}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{What is Missing in XAI So Far?}}},
doi = {{10.1007/s13218-022-00786-2}},
volume = {{36}},
year = {{2022}},
}