@article{23867, abstract = {{The joining of plastics is required because component geometries are severely restricted in conventional manufacturing processes such as injection molding or extrusion. In addition to established processes such as hot plate welding, infrared welding, or vibration welding, hot gas butt welding is becoming more and more important industrially due to its advantages. The main benefits are the contactless heating process, the suitability for glass fiber reinforced, and high-temperature plastics as well as complex component geometries. However, various degradation phenomena can occur during the heating process used for economic reasons, due to the presence of oxygen in the air and to the high gas temperatures. In addition, the current patent situation suggests that welding with an oxidizing gas is not permissible depending on the material. On the other hand, however, there is experience from extrusion welding, with which long-term resistant weld seams can be produced using air. Investigations have shown that the same weld seam properties can be achieved with polypropylene using either air or nitrogen as the process gas. Experimental investigations have now been carried out on the suitability of different gases with regard to the weld seam quality when welding polyamides, which are generally regarded as more prone to oxidation. The results show that weld strengths are higher when nitrogen is used as process gas. However, equal weld strengths can be achieved with air and nitrogen when the material contains heat stabilizers.}}, author = {{Bialaschik, Max and Schöppner, Volker and Albrecht, Mirko and Gehde, Michael}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, pages = {{1161--1169}}, title = {{{Influence of material degradation on weld seam quality in hot gas butt welding of polyamides}}}, doi = {{10.1007/s40194-021-01108-0}}, year = {{2021}}, } @article{24555, author = {{Moritzer, Elmar and Elsner, Christian Lennart and Schumacher, Christian}}, issn = {{0272-8397}}, journal = {{Polymer Composites}}, number = {{11}}, pages = {{6065--6079}}, title = {{{Investigation of Metal‐Polymer Composites Manufactured by Fused Deposition Modeling with Regard to Process Parameters}}}, doi = {{10.1002/pc.26285}}, volume = {{42}}, year = {{2021}}, } @article{24131, abstract = {{Glass/carbon fiber reinforced plastic (GFRP/CFRP) and hybrid components have attracted increasing attention in lightweight applications. However, residual stresses induced in the manufacturing process of these components can result in warpage and, eventually, negatively affect the mechanical performance of the composite structures. In the present work, GFRP, CFRP, GFRP/steel and CFRP/steel hybrid components were manufactured through the prepreg-press-technology always employing the same process parameters. The residual stresses of these components were measured through the hole drilling method (HDM), based on an adequate formalism to evaluate the residual stresses for orthotropic materials including the calculation of the calibration coefficients via finite element analysis (FEA). In FEA, the real material lay-up and mechanical properties of the samples were considered. The warpage induced by residual stresses was measured after the samples were removed from the tool. The measured residual stresses and warpage of four different types of samples were compared and results were analyzed in depth. The results obtained can be extended to other hybrid materials and even could be used for designing multi-stable laminates for application in adaptive structures. Moreover, the effects of the drilling process parameters of HDM, e.g., the drilling speed, the drilling increment and the zero-depth setting, on the resulting residual stresses of GFRP were investigated. The reliability of residual stress measurements in GFRP using HDM was validated through mechanical bending tests. The conclusions concerning the choice of optimal drilling parameters for GFRP could be directly applied for other types of samples considered in the present work.}}, author = {{Wu, Tao and Tinkloh, Steffen Rainer and Tröster, Thomas and Zinn, Wolfgang and Niendorf, Thomas}}, issn = {{2075-4701}}, journal = {{Metals}}, title = {{{Measurement and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid Components}}}, doi = {{10.3390/met11020335}}, year = {{2021}}, } @article{21064, author = {{Tinkloh, Steffen Rainer and Wu, Tao and Tröster, Thomas and Niendorf, Thomas}}, issn = {{2075-4701}}, journal = {{Metals}}, title = {{{The Effect of Fiber Waviness on the Residual Stress State and Its Prediction by the Hole Drilling Method in Fiber Metal Laminates: A Global-Local Finite Element Analysis}}}, doi = {{10.3390/met11010156}}, year = {{2021}}, } @misc{31744, author = {{Moritzer, Elmar and Hillemeyer, Johannes and Kramer, M. and Hopmann, C.}}, booktitle = {{Joining Plastics}}, issn = {{1864-3450}}, pages = {{94--103}}, title = {{{Designing of thermosetting plastic components for direct screwing - Auslegung von Duroplastbauteilen zur Direktverschraubung}}}, year = {{2021}}, } @misc{31740, author = {{Moritzer, Elmar and Richters, Maximilian}}, booktitle = {{Journal of Applied Polymer Science}}, number = {{38}}, title = {{{ Characterization of wood-filled thermoplastic polyurethanes for the injection molding process}}}, volume = {{138}}, year = {{2021}}, } @inproceedings{31760, author = {{Moritzer, Elmar and Krassmann, Dimitri and Brikmann, Johannes}}, booktitle = {{11. Fügetechnisches Gemeinschaftskolloquium}}, location = {{Dresden}}, title = {{{Entwicklung der Spritzniettechnik als werkstoffgerechtes Fügeverfahren für hybride Strukturen}}}, year = {{2021}}, } @misc{31762, author = {{Moritzer, Elmar and Jilg, J. and Rücker, Tobias}}, booktitle = {{Kunststoffe}}, pages = {{24--27}}, title = {{{Er kommt auf die Korngröße an, Mikrogranulat verbessert die Verteilung feindisperser Füllstoffe in der Direktcompoundierung}}}, year = {{2021}}, } @misc{31758, author = {{Schöppner, Volker and Martens, Jan Hendrik}}, booktitle = {{Kunststoffe}}, issn = {{0023- 5563}}, pages = {{91--93}}, title = {{{Eine runde Sache}}}, year = {{2021}}, } @inproceedings{31767, author = {{Hopp, Matthias and Tölle, Lisa}}, booktitle = {{36th International Conference of Polymer Processing Society (PPS)}}, title = {{{Influence of Fiber Content on the Fiber Dust Formation During Shredding for Mechanical Recycling of Different Glass and Carbon Fiber Reinforced Thermoplastics}}}, year = {{2021}}, } @misc{31765, author = {{Moritzer, Elmar and Hillemeyer, Johannes and Lotzin, R.}}, booktitle = {{Kunststoffe}}, issn = {{0023-5563}}, pages = {{42-- 45}}, title = {{{Fügeelement angespritzt - Einfluss auf die Verbundfestigkeit zwischen Organoblech und Schraubblindniet untersucht}}}, year = {{2021}}, } @misc{31763, author = {{Moritzer, Elmar and Wortmann, M. and Krieger, P. and Hüsgen, B. and Frese, N.}}, booktitle = {{ACS Omega}}, title = {{{Effect of Isocyanate Absorption on the Mechanical Properties of Silicone Elastomers in Polyurethane Vacuum Casting}}}, year = {{2021}}, } @inproceedings{31774, author = {{Moritzer, Elmar and Wächter, Julian and Fuhrmann, C.}}, booktitle = {{23rd International Conference Materials}}, isbn = {{1314-7269}}, location = {{Burgas (Bulgarien)}}, pages = {{58-- 67}}, title = {{{ INVESTIGATION OF THE PROCESSABILITY OF DIFFERENT HIGHPERFORMANCE MATERIALS IN THE FDM PROCESS WITH REGARD TO THE SHRINKAGE BEHAVIOR}}}, year = {{2021}}, } @misc{31776, author = {{Schöppner, Volker and Gevers, Karina}}, booktitle = {{K-Zeitung}}, issn = {{1436-6401}}, pages = {{19}}, title = {{{ Lebensdauer vorhersagen?}}}, year = {{2021}}, } @misc{31775, author = {{Moritzer, Elmar}}, booktitle = {{Kunststoffe}}, pages = {{64--67}}, title = {{{ Kühlen mit dem Wärmerohr}}}, year = {{2021}}, } @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}}, }