@phdthesis{27644, author = {{Bayazian, Hoda}}, title = {{{Evaluation of LLDPE and PLA Films Manufactured with High Speed}}}, year = {{2020}}, } @phdthesis{27645, author = {{Sporkmann, Frederik }}, title = {{{Modellierung der Materialströmung auf gleichläufigen Doppelschneckenextrudern mit Hilfe der Performance Mapping Methode}}}, year = {{2020}}, } @phdthesis{27646, author = {{Resonnek, Verena}}, title = {{{Entwicklung einer Zylindertemperatureinstellungsregelung auf Basis von Fuzzy-Logik }}}, year = {{2020}}, } @article{23861, author = {{Altepeter, Matthias and Schöppner, Volker}}, journal = {{Kunststoffe}}, publisher = {{Carl Hanser Verlag}}, title = {{{Materialabbau im Doppelschneckenextruder}}}, year = {{2020}}, } @inproceedings{23865, abstract = {{Regarding the design of single screw extruders, the prediction of the throughput needs to be of high accuracy. The calculation of the solids conveying throughput is particularly important for extruders with a grooved feed section. In contrast to smooth barrel extruders the throughput of the entire plant is determined at the feed section. Various simplifications are necessary for an analytical modelling of the solids conveying, e.g. the classification into conveying cases, the assumption of solid block flow and the assumption of pressure anisotropy coefficients. In numerical simulations with the Discrete Element Method (DEM), which has recently been successfully used to describe solids conveying in smooth barrel extruders, the simplifications mentioned above are not taken into account. Here, the pellets are approximated as spherical particles or particles composed of spheres. Based on virtual overlaps, contact models and the solution of Newton's equations of motion, a more complex consideration of the pellet flow is possible. In each iteration step of the simulation, the particle velocities, contact forces and derived quantities, e.g. the mass throughput in the screw channel and the grooves or the radial pressure build-up along the grooved barrel can be evaluated. Therefore, a DEM simulation model can be investigated by means of statistical design of experiments in order to convert the target values into a metamodel by regression. Long computation times of numerical simulations will be avoided in this matter as well as too simple assumptions of analytical approaches. The influencing parameters to be simulated are divided into material, geometry and process parameters. Relevant material parameters are the coefficients of friction of the polymer-polymer and polymer-steel surface as well as the restitution coefficient and the particle diameter. The geometry is varied in the form of the screw diameter, the channel depth and pitch, the number of grooves and their width, depth and angle. By varying the angle, both conventional axial grooves and helical grooves are taken into account. Finally, the process parameters speed and backpressure are also considered in the simulations. In order to reduce the simulation effort, irrelevant parameters are identified in preliminary investigations. }}, author = {{Schöppner, Volker and Brüning, Florian}}, booktitle = {{Advances in Polymer Processing 2020: Proceedings of the International Symposium on Plastics Technology}}, editor = {{Hopmann, Christian and Dahlmann, Rainer}}, publisher = {{Springer}}, title = {{{Development of a Solids Conveying Throughput Model for Grooved Barrel Extruders based on Discrete Element Simulations}}}, year = {{2020}}, } @article{23868, author = {{Albrecht, Mirko and Bialaschik, Max and Gehde, Michael and Schöppner, Volker}}, isbn = {{978-3-96144-098-6 }}, journal = {{DVS CONGRESS 2020 - Große Schweißtechnische Tagung}}, publisher = {{DVS Media GmbH}}, title = {{{Einfluss der Materialschädigung auf die Schweißnahtqualität beim Warmgasstumpfschweißen von Polyamiden}}}, volume = {{365}}, year = {{2020}}, } @inproceedings{23873, author = {{Albrecht, Mirko and Bialaschik, Max and Gehde, Michael and Schöppner, Volker}}, location = {{Pretoria}}, title = {{{Hot gas welding – Influences of the tool design}}}, doi = {{10.1063/5.0029478}}, year = {{2020}}, } @inproceedings{24247, author = {{Moritzer, Elmar and Hillemeyer, Johannes}}, booktitle = {{73rd Annual Assembly of International Institute of Welding (IIW) and International Conference}}, title = {{{Material Specific Predicting of the Optimal Joining Parameters for the Screw Blind Rivet Joining Process}}}, year = {{2020}}, } @inbook{24479, author = {{Moritzer, Elmar and Hüttner, M. and Henning, Bernd and Webersen, Manuel}}, booktitle = {{Advances in Polymer Processing 2020}}, title = {{{The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization}}}, doi = {{10.1007/978-3-662-60809-8_16}}, year = {{2020}}, } @inproceedings{42892, abstract = {{This paper presents the results of static short-term and long-term tensile tests for beta-nucleated joined polypropylene samples by the hot plate welding process. In the present study different dimensionless joining displacements are accounted for. The results show that high short-term tensile strength does not directly transfer to high long-term tensile strength. The morphology of the weld seam in the joined samples is examined by means of transmitted and reflected light microscopy. For the dimensionless joining displacements of 0.75 and 0.95, stretched spherulites are obtained. X-Ray diffraction can be used as a tool for qualitative and quantitative analysis and eventually for differentiation of samples of various joining displacements.}}, author = {{Wübbeke, Andrea and Schöppner, Volker and Paul, André and Tiemann, Michael and Austermeier, Laura and Fitze, Marcus and Chen, Mingie and Jakob, Fabian and Heim, Hans-Peter and Wu, Tao and Niendorf, Thomas and Röhricht, Marie-Luise and Schmidt, Michael}}, booktitle = {{SPE ANTEC 2020: The Virtual Edition 5 }}, title = {{{Long- and Short-Term Tensile Strength and Morphology of Joined Beta-Nucleated Polypropylene Parts}}}, year = {{2020}}, } @inproceedings{24245, author = {{Schöppner, Volker and Wübbeke, Andrea and Geißler, B. and Schmidt, M. and Maginer, A. and Wu, T. and Niendorf, T. and Jakob, F. and Heim, H.}}, booktitle = {{73rd Annual Assembly of the International Institute of Welding (IIW)}}, location = {{Marina Bay (Singapore)}}, publisher = {{Springer-Verlag}}, title = {{{Investigation of residual stresses of hot plate welding}}}, year = {{2020}}, } @article{24236, abstract = {{In diesem Artikel werden das Scherzugverhalten und der morphologische Zustand von konturgeschweißtem Polypropylen (PP) mit einem Massenanteil von 0,2% Ruß untersucht. Dabei zeigen die Ergebnisse ...}}, author = {{Schöppner, Volker and Wübbeke, Andrea and Schriegel, Fabian and Paul, Andrej and Tiemann, Michael and Geißler, Bastian and Schmidt, Michael and Magnier, Arnaud and Niendorf, Thomas }}, journal = {{Joining Plastics}}, pages = {{30--35}}, title = {{{Selected Aspects for the Assessment of Laser Transmission Welding}}}, year = {{2020}}, } @inproceedings{24472, author = {{Schöppner, Volker and Wübbeke, Andrea and Paul, A. and Tiemann, M. and Austermeier, Laura and Fitze, M. and Chen, M. and Jakob, F. and Heim, H.-P- and Wu, T. and Niendorf, T. and Röhricht, M.-L. and Schmidt, M.}}, booktitle = {{ANTEC20}}, location = {{Texas (USA)}}, title = {{{LONG- AND SHORT-TERM TENSILE STRENGTH AND MORPHOLOGY OF JOINED BETA-NUCLEATED POLYPROPYLENE PARTS}}}, year = {{2020}}, } @inproceedings{25517, author = {{Stüker, Daniel and Schöppner, Volker}}, location = {{Chemnitz}}, title = {{{Einfluss unterschiedlicher Temperatureinstellungen und Schneckengeometrien auf die thermische Homogenität und das Prozessverhalten von schnelllaufenden Kautschukextrudern}}}, year = {{2019}}, } @proceedings{25580, editor = {{Moritzer, Elmar and Budde, Christopher and Hüttner, Matthias and Krassmann, Dimitri}}, title = {{{Nieten im Spritzgießprozess zur Verbindung von Hybridbauteilen aus Organoblechen und Metallen}}}, year = {{2019}}, } @inproceedings{25582, author = {{Moritzer, Elmar and Krassmann, Dimitri}}, title = {{{Nieten ohne Fügeelement zur Verbindung von Hybridbauteilen aus Organoblechen und Metallen}}}, year = {{2019}}, } @proceedings{25583, editor = {{Moritzer, Elmar and Krassmann, Dimitri}}, title = {{{Nieten ohne Fügeelement zur Verbindung von Hybridbauteilen aus Organoblechen und Metallen}}}, year = {{2019}}, } @article{25608, author = {{Moritzer, Elmar and Wortmann, M. and Frese, N. and Sabantina, L. and Petkau, R. and Kinzel, F. and Golzhauser, A. and Husgen, B. and Ehrmann, A.}}, journal = {{NANOMATERIALS}}, number = {{9}}, title = {{{New Polymers for Needleless Electrospinning from Low-Toxic Solvents}}}, year = {{2019}}, } @article{25610, author = {{Moritzer, Elmar and Wortmann, M. and Hoffmann, A. and Frese, N. and Heide, A. and Brikmann, J. and Brandt, N. and Menzel, M. and Gölzhäuser, A. and Häsgen, B.}}, journal = {{POLYMER-PLASTICS TECHNOLOGY AND MATERIALS}}, number = {{58}}, pages = {{1937--1943}}, title = {{{Advanced output of silicone molds in vacuum casting processes by polyamide 12 powder supplementation}}}, year = {{2019}}, } @inproceedings{25611, author = {{Moritzer, Elmar and Hüttner, M. and Henning, M. and Webesen, M. and Woitschek, F.}}, booktitle = {{45. Deutsche Jahrestagung für Akustik - DAGA}}, location = {{Rostock (Deutschland)}}, pages = {{505--508}}, title = {{{Akustische Charakterisierung der mechanischen Eigenschaften künstlich gealterter Polymere}}}, year = {{2019}}, }