@article{54649, author = {{Borgert, Thomas and Nordieker, Ansgar Bernhard and Wiens, Eugen and Homberg, Werner}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, publisher = {{Elsevier BV}}, title = {{{Investigations to improve the tool life during thermomechanical and incremental forming of steel auxiliary joining elements}}}, doi = {{10.1016/j.jajp.2024.100185}}, volume = {{9}}, year = {{2024}}, } @article{57742, author = {{Böhnke, Max and Bielak, Christian Roman and Beck, Robert and Bobbert, Mathias and Meschut, Gerson}}, issn = {{2223-7690}}, journal = {{Friction}}, publisher = {{Tsinghua University Press}}, title = {{{Development of a friction model for the numerical simulation of clinching processes}}}, doi = {{10.26599/frict.2025.9441052}}, year = {{2024}}, } @article{59585, abstract = {{Similar to bulk metal forming, clinch joining is characterised by large plastic deformations and a variety of different 3D stress states, including severe compression. However, inherent to plastic forming is the nucleation and growth of defects, whose detrimental effects on the material behaviour can be described by continuum damage models and eventually lead to material failure. As the damage evolution strongly depends on the stress state, a stress-state-dependent model is utilised to correctly track the accumulation. To formulate and parameterise this model, besides classical experiments, so-called modified punch tests are also integrated herein to enhance the calibration of the failure model by capturing a larger range of stress states and metal-forming-specific loading conditions. Moreover, when highly ductile materials are considered, such as the dual-phase steel HCT590X and the aluminium alloy EN AW-6014 T4 investigated here, strong necking and localisation might occur prior to fracture. This can alter the stress state and affect the actual strain at failure. This influence is captured by coupling plasticity and damage to incorporate the damage-induced softening effect. Its relative importance is shown by conducting inverse parameter identifications to determine damage and failure parameters for both mentioned ductile metals based on up to 12 different experiments.}}, author = {{Friedlein, Johannes and Böhnke, Max and Schlichter, Malte Christian and Bobbert, Mathias and Meschut, Gerson and Mergheim, Julia and Steinmann, Paul}}, issn = {{2504-4494}}, journal = {{Journal of Manufacturing and Materials Processing}}, number = {{4}}, publisher = {{MDPI AG}}, title = {{{Material Parameter Identification for a Stress-State-Dependent Ductile Damage and Failure Model Applied to Clinch Joining}}}, doi = {{10.3390/jmmp8040157}}, volume = {{8}}, year = {{2024}}, } @article{47589, author = {{Krämer, Felix and Paradies, Jan and Fernández, Israel and Breher, Frank}}, issn = {{1755-4330}}, journal = {{Nature Chemistry}}, keywords = {{General Chemical Engineering, General Chemistry}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{A crystalline aluminium–carbon-based ambiphile capable of activation and catalytic transfer of ammonia in non-aqueous media}}}, doi = {{10.1038/s41557-023-01340-9}}, year = {{2023}}, } @book{47676, editor = {{Bartz, Christina and Ruchatz, Jens and Wattolik, Eva}}, isbn = {{978-3-8376-6479-9}}, publisher = {{transcript}}, title = {{{Food - Media - Senses}}}, year = {{2023}}, } @inproceedings{46297, abstract = {{Exploratory landscape analysis (ELA) in single-objective black-box optimization relies on a comprehensive and large set of numerical features characterizing problem instances. Those foster problem understanding and serve as basis for constructing automated algorithm selection models choosing the best suited algorithm for a problem at hand based on the aforementioned features computed prior to optimization. This work specifically points to the sensitivity of a substantial proportion of these features to absolute objective values, i.e., we observe a lack of shift and scale invariance. We show that this unfortunately induces bias within automated algorithm selection models, an overfitting to specific benchmark problem sets used for training and thereby hinders generalization capabilities to unseen problems. We tackle these issues by presenting an appropriate objective normalization to be used prior to ELA feature computation and empirically illustrate the respective effectiveness focusing on the BBOB benchmark set.}}, author = {{Prager, Raphael Patrick and Trautmann, Heike}}, booktitle = {{Applications of Evolutionary Computation}}, editor = {{Correia, João and Smith, Stephen and Qaddoura, Raneem}}, isbn = {{978-3-031-30229-9}}, pages = {{411–425}}, publisher = {{Springer Nature Switzerland}}, title = {{{Nullifying the Inherent Bias of Non-invariant Exploratory Landscape Analysis Features}}}, year = {{2023}}, } @inproceedings{46298, abstract = {{The design and choice of benchmark suites are ongoing topics of discussion in the multi-objective optimization community. Some suites provide a good understanding of their Pareto sets and fronts, such as the well-known DTLZ and ZDT problems. However, they lack diversity in their landscape properties and do not provide a mechanism for creating multiple distinct problem instances. Other suites, like bi-objective BBOB, possess diverse and challenging landscape properties, but their optima are not well understood and can only be approximated empirically without any guarantees.}}, author = {{Schäpermeier, Lennart and Kerschke, Pascal and Grimme, Christian and Trautmann, Heike}}, booktitle = {{Evolutionary Multi-Criterion Optimization}}, editor = {{Emmerich, Michael and Deutz, André and Wang, Hao and Kononova, Anna V. and Naujoks, Boris and Li, Ke and Miettinen, Kaisa and Yevseyeva, Iryna}}, isbn = {{978-3-031-27250-9}}, pages = {{291–304}}, publisher = {{Springer Nature Switzerland}}, title = {{{Peak-A-Boo! Generating Multi-objective Multiple Peaks Benchmark Problems with Precise Pareto Sets}}}, year = {{2023}}, } @inproceedings{47626, author = {{Rüther, Moritz Johannes and Klippstein, Sven Helge and Schmid, Hans-Joachim}}, booktitle = {{PARTEC International Congress on Particle Technology - Book of Abstracts}}, isbn = {{ 978-3-18-990139-9}}, issn = {{0083-5560}}, location = {{Nürnberg}}, pages = {{172 -- 176}}, publisher = {{VDI Verlag GmbH}}, title = {{{Correlation between SLS-Powder processability and particle properties }}}, year = {{2023}}, } @inproceedings{48577, author = {{Henkenjohann, Mark and Nolte, Udo and Henke, Christian and Trächtler, Ansgar}}, booktitle = {{2023 International Conference on Unmanned Aircraft Systems (ICUAS)}}, publisher = {{IEEE}}, title = {{{Novel Cascaded Incremental Nonlinear Dynamic Inversion Controller Approach for a Tiltrotor VTOL}}}, doi = {{10.1109/icuas57906.2023.10156317}}, year = {{2023}}, } @inproceedings{46764, abstract = {{Polymer composites represent the industry standard in injection molding for the production of plastic components with increased requirements in terms of heat resistance and stiffness. In the field of laser sintering (LS), these materials are less common so far. In order to extend the available material variety for the LS process, new ceramic-filled Polyamide 613 powders are investigated within the scope of this work. Here, the resulting properties from two different powder production methods are compared. One filled powder is produced by dry blending and the other powder with the same filler and filling ratio is produced by encapsulating the filler particles inside the polymer particles within the dissolution-precipitation process. It was found that encapsulating the filler particles can provide certain benefits for the processability, for example an improved powder flowability or better filler dispersion. However, encapsulating the filler also alters the thermal properties of the precipitated powder.}}, author = {{Kletetzka, Ivo and Neitzel, Fabian and Schmid, Hans-Joachim}}, booktitle = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium}}, editor = {{Beaman, Joseph}}, location = {{Austin}}, publisher = {{Laboratory for Freeform Fabrication and University of Texas}}, title = {{{Assessing the Impact of the Powder Production Method on Ceramic-filled Polyamide Composites made by Laser Sintering}}}, volume = {{34}}, year = {{2023}}, } @inproceedings{44316, author = {{Rozo Vasquez, Julian and Arian, Bahman and Kersting, Lukas and Walther, Frank and Homberg, Werner and Trächtler, Ansgar}}, location = {{Krakau}}, title = {{{Softsensor model of phase transformation during flow forming of metastable austenitic steel AISI 304L}}}, year = {{2023}}, } @inbook{48643, author = {{Akbulut Irmak, Emine Fulya and Hanses, Hendrik and Horwath, Ilona and Tröster, Thomas}}, booktitle = {{Climate Protection, Resource Efficiency, and Sustainable Engineering}}, isbn = {{9783837663778}}, issn = {{2703-1543}}, publisher = {{transcript Verlag}}, title = {{{Case Study III: Challenges of lightweight design, vehicles, and rescuers}}}, doi = {{10.14361/9783839463772-006}}, year = {{2023}}, } @inproceedings{48672, author = {{Schöppner, Volker and Gevers, Karina and Schraa, L. and Töws, P. and Uhlig, K. and Stommel, M. and Decker, J.}}, location = {{Singapur (Singapur)}}, title = {{{Evaluation of the effects of different heating strategies on the joining partners during infrared welding of black polyamides}}}, year = {{2023}}, } @article{48671, author = {{Schöppner, Volker and Gevers, Karina and Schraa, L. and Uhlig, K. and Töws, P. and Decker, J. and Stommel, M.}}, journal = {{Proceedings of the 2023 International Conference on Composite Materials}}, title = {{{Evaluation of Infrared Welded Joints of Short Fiber Reinforced Thermoplastics Using Digital Image Correlation}}}, year = {{2023}}, } @article{48665, author = {{Schöppner, Volker and Arndt, Theresa}}, issn = {{1864-3450}}, journal = {{Joining Plastics}}, number = {{17}}, pages = {{20--27}}, title = {{{Entwicklung von Scale-Up-Regeln für das quasisimultane Laserdurchstrahlschweißen (QSS) von Thermoplasten}}}, year = {{2023}}, } @inproceedings{48662, author = {{Schöppner, Volker and Petzke, J.}}, location = {{Denver, CO (USA)}}, title = {{{Dielectric Heating in the Vulcanization Process of Rubber Extrudates}}}, year = {{2023}}, } @inproceedings{48663, author = {{Moritzer, Elmar and Held, Christian}}, location = {{Essen (Deutschland)}}, title = {{{Direktverschraubung additiv gefertigter Kunststoffbauteile}}}, year = {{2023}}, } @article{48751, author = {{Schöppner, Volker and Gevers, Karina and Hoenen, N. and Uhlig, K. and Töws, P. and Decker, J. and Stommel, M.}}, journal = {{Advanced Structured Materials}}, title = {{{Simulation of Infrared Welded Short Fiber Reinforced Thermoplastic Parts based on Mori-Tanaka Homogenization Method}}}, year = {{2023}}, } @article{48754, author = {{Schöppner, Volker and Austermeier, Laura and Trienens, Dorte}}, issn = {{1618-8357}}, journal = {{Wissenschaftlicher Arbeitskreis Kunststofftechnik}}, pages = {{62--66}}, title = {{{Verbesserung der Betriebspunktauslegung durch Schneckensimulation}}}, year = {{2023}}, } @inproceedings{48752, author = {{Moritzer, Elmar and Scholle, Maximilian}}, location = {{St. Gallen (Schweiz)}}, title = {{{The main factors influencing glass fiber shortening in the processing of bulk molding compounds (BMC)}}}, year = {{2023}}, }