@inproceedings{31777, author = {{Schöppner, Volker and Altepeter, Matthias and Wanke, Sven}}, booktitle = {{36th International Conference of the Polymer Processing Society (PPS)}}, location = {{Melbourne (Kanada)}}, title = {{{Material Degradation of Polypropylene on the Co-Rotating Twin Screw Extruder}}}, year = {{2021}}, } @inproceedings{31781, author = {{Moritzer, Elmar and Bürenhaus, Franziska Isabelle}}, booktitle = {{27. Techomer - Fachtagung über Verarbeitung und Anwendung von Polymeren}}, location = {{ Chemnitz (Online)}}, title = {{{Untersuchung der Faserlängenabnahme von kurz- und langglasfaserverstärk-ten Thermoplasten im Spritzgießprozess}}}, year = {{2021}}, } @misc{31778, author = {{Moritzer, Elmar and Hillemeyer, Johannes and Lotzin, R.}}, booktitle = {{Kunststoffe International}}, issn = {{1862–4243}}, pages = {{29--32}}, title = {{{Molding on a Joining Element - Study of the Factors Influencing the Strength of the Bond between a Thermoplastic Composite and a Screw-in Blind Rivet}}}, year = {{2021}}, } @misc{31779, author = {{Hopp, Matthias and Tölle, Lisa and Hoemann, Theresa}}, booktitle = {{Gummi Fasern Kunststoffe}}, pages = {{2--7}}, title = {{{Reduzierung der Faserstaubentstehung beim mechanischen Recycling - Zerkleinern von carbonfaserverstärkten Polycarbonaten mit unterschiedlichen Verstärkungsformen}}}, year = {{2021}}, } @misc{31780, author = {{Moritzer, Elmar and Wortmann, M. and Frese, N. and Brinkmann, J. and Ehrmann, A. and Hüsgen, B.}}, booktitle = {{Macromolecular Symposia}}, title = {{{Silicone Mold Accuracy in Polyurethane Vacuum Casting}}}, year = {{2021}}, } @inproceedings{31782, author = {{Schöppner, Volker and Kleinschmidt, Dennis}}, booktitle = {{27. Techomer - Fachtagung über Verarbeitung und Anwendung von Polymeren}}, location = {{Chemnitz (Online) }}, title = {{{Viskoelastische Materialmodellierung in Strömungssimulationen}}}, year = {{2021}}, } @inproceedings{31785, author = {{Schöppner, Volker and Albrecht, M. and Gehde, M. and Bialaschik, Max Oliver}}, booktitle = {{Technomer}}, location = {{ Chemnitz (Deutschland)}}, title = {{{Warmgasstumpfschweißen - Einfluss des Werkzeugdesigns und des verwendeten Prozessgases auf das Erwärm- und Schweißverhalten}}}, year = {{2021}}, } @inproceedings{31784, author = {{Schöppner, Volker and Dörner, M. and Schall, Christoph Wilhelm Theodor}}, booktitle = {{Technomer 2021}}, location = {{Chemnitz}}, title = {{{Vorteilhaftes Prozessverhalten von Wave-Schnecken in der Einschneckenextrusion}}}, year = {{2021}}, } @misc{31786, author = {{Schöppner, Volker and Bialaschik, Max Oliver and Albrecht, M. and Gehde, M.}}, booktitle = {{Joining Plastics}}, issn = {{1864-3450}}, pages = {{162--169}}, title = {{{Warmgasstumpfschweißen von Kunststoffen}}}, year = {{2021}}, } @inproceedings{31771, author = {{Moritzer, Elmar and Bürenhaus, Franziska Isabelle}}, booktitle = {{36th International Conference of the Polymer Processing Society (PPS)}}, location = {{ Montréal (Kanada)}}, title = {{{Investigation of Fiber Orientation and its Influence on Fiber Length Degradation in Simple Shear Flow for Glass Fiber Reinforced Polypropylene}}}, year = {{2021}}, } @inproceedings{24439, author = {{Gräßler, Iris and Hesse, Philipp}}, location = {{Valletta, Malta}}, pages = {{37--41}}, publisher = {{The University of Malta}}, title = {{{Decision Support for Product Specific Recycling}}}, year = {{2021}}, } @article{26854, author = {{Moritzer, Elmar and Flachmann, Felix}}, journal = {{Kunststoffe}}, pages = {{42--44}}, title = {{{Die Fließfront darf nicht brechen}}}, volume = {{12}}, year = {{2021}}, } @misc{31707, author = {{Moritzer, Elmar and Hillemeyer, J. and Kramer, M. and Hopmann, C. }}, booktitle = {{Plastverarbeiter}}, issn = {{0032-1338}}, number = {{71}}, pages = {{56--60}}, title = {{{Direktverschraubung von Duroplasten Eine wirtschaftliche Lösung}}}, year = {{2021}}, } @misc{31725, author = {{Moritzer, Elmar and Wortmann, Martin and Viertel, Klaus and Welle, Alexander and Keil, Waldemar and Frese, Natalie and Hachmann, Wiebke and Krieger, Philipp and Brikmann, Johannes and Schmidt, Claudia and Hüsgen, Bruno}}, booktitle = {{International Journal of Heat and Mass Transfer}}, title = {{{Anomalous bulk diffusion of methylene diphenyl diisocyanate in silicone elastomer}}}, year = {{2021}}, } @inproceedings{31719, author = {{Schöppner, Volker and Vogtschmidt, Sascha}}, booktitle = {{ DVS CONGRESS}}, isbn = {{978-3-96144-147-1}}, location = {{digital}}, title = {{{ Analyse des Erwärm- und Umstellverhaltens beim Schweißen von hochtemperaturbeständigen Kunststoffen}}}, year = {{2021}}, } @inproceedings{21726, author = {{Triebus, Marcel and Tröster, Thomas}}, booktitle = {{9th NRW Nano Conference - Innovations in Materials and Applications}}, location = {{Web}}, title = {{{HyOpt - Optimization-Based Development of Hybrid Materials}}}, year = {{2021}}, } @article{33895, abstract = {{Heat-assisted forming processes are becoming increasingly important in the manufacturing of sheet metal parts for body-in-white applications. However, the non-isothermal nature of these processes leads to challenges in evaluating the forming limits, since established methods such as Forming Limit Curves (FLCs) only allow the assessment of critical forming strains for steady temperatures. For this reason, a temperature-dependent extension of the well-established GISSMO (Generalized Incremental Stress State Dependent Damage Model) fracture indicator framework is developed by the authors to predict forming failures under non-isothermal conditions. In this paper, a general approach to combine several isothermal FLCs within the temperature-extended GISSMO model into a temperature-dependent forming limit surface is investigated. The general capabilities of the model are tested in a coupled thermo-mechanical FEA using the example of warm forming of an AA5182-O sheet metal cross-die cup. The obtained results are then compared with state of the art of evaluation methods. By taking the strain and temperature path into account, GISSMO predicts greater drawing depths by up to 20% than established methods. In this way the forming and so the lightweight potential of sheet metal parts can by fully exploited. Moreover, the risk and locus of failure can be evaluated directly on the part geometry by a contour plot. An additional advantage of the GISSMO model is the applicability for low triaxialities as well as the possibility to predict the materials behavior beyond necking up to ductile fracture.}}, author = {{Camberg, Alan Adam and Erhart, Tobias and Tröster, Thomas}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{17}}, publisher = {{MDPI AG}}, title = {{{A Generalized Stress State and Temperature Dependent Damage Indicator Framework for Ductile Failure Prediction in Heat-Assisted Forming Operations}}}, doi = {{10.3390/ma14175106}}, volume = {{14}}, year = {{2021}}, } @inproceedings{31750, author = {{Köllermeier, Jonas and Schöppner, Volker}}, booktitle = {{36th International Conference of the Polymer Processing Society (PPS)}}, location = {{Montreal (Kanada)}}, title = {{{Development of a Dynamic Strategy to Determine the Optimal Barrel Temperature of Single Screw Extruders}}}, year = {{2021}}, } @inproceedings{24101, abstract = {{Arburg Plastic Freeforming (APF) is an additive manufacturing process with which three-dimensional, thermoplastic components can be produced layer by layer. Visual and geometrical properties are a major criterion for characterizing the resulting component quality. The aim of this study was to investigate the influences on visual and geometrical properties of APF components depending on process parameters. Initially the focus was on the analysis of the shrinkage behavior of ABS-M30 (Stratasys). On the basis of the results and an existing procedure by the machine manufacturer, an optimized procedure for determining the scaling factors was developed to counteract the shrinkage. With this procedure a higher dimensional accuracy of the components can be achieved. In addition, it was investigated whether an adaption of the form factor based on a mathematical model depending on the component geometry makes sense. The results were transferred into manufacturing guidelines, which allow the user of the APF-technology to optimize process parameters more efficiently.}}, author = {{Moritzer, Elmar and Hecker, Felix and Elsner, Christian Lennart and Hirsch, André}}, booktitle = {{Proceedings: 2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)}}, editor = {{Bourell, David}}, location = {{Austin, Texas, USA}}, pages = {{467--474}}, title = {{{Investigations for the Optimization of Visual and Geometrical Properties of Arburg Plastic Freeforming Components}}}, doi = {{10.26153/tsw/17567}}, year = {{2021}}, } @inproceedings{24099, abstract = {{The additive manufacturing process Fused Deposition Modeling (FDM) is established in the industry for many years. A new, similar process to FDM is the Arburg Plastic Freeforming (APF). The main differences between both processes are the form of the starting material (FDM: Filaments, APF: Conventional granulate) and the material deposition during the layer formation (FDM: Melt strand, APF: fine molten droplets). Since the two processes can be used in similar applications, the aim of this study is to compare both processes in a holistic way. Furthermore, the advantages and disadvantages of the processes are to be highlighted. The systematic comparison between a Stratasys 400mc and the Freeformer 200-3X is divided into the areas of component properties, design limitations and economic efficiency. The material ABS-M30 (Stratasys) is used in both processes. The results show comparable component properties regarding mechanical and optical properties but also differences in design limitations and cost efficiency. }}, author = {{Moritzer, Elmar and Hecker, Felix and Driediger, Christine and Hirsch, André}}, booktitle = {{Proceedings: 2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)}}, editor = {{Bourell, David}}, location = {{Austin, Texas, USA}}, pages = {{575--584}}, title = {{{Comparison of Component Properties and Economic Efficiency of the Arburg Plastic Freeforming and Fused Deposition Modeling}}}, doi = {{10.26153/tsw/17577}}, year = {{2021}}, }