@inproceedings{16075, author = {{Ahlers, Dominik and Tröster, Thomas}}, location = {{Nördlingen}}, title = {{{Aspekte der Produktentwicklung in der additiven Fertigung}}}, year = {{2017}}, } @article{22038, abstract = {{Micro Physiological Systems (MPS), also known as Multi-Organ-Chip, Organ-on-a-Chip, or Body-on-a-Chip, are advanced microfluidic systems that allow the cultivation of different types of cells and tissue in just one common circuit. Furthermore, they thus can also adjust the interaction of these different tissues. Perspectival MPS will replace animal testing. For fast and flexible manufacturing and marking of MPS, a concept for a universal micromachining platform has been developed which provides the following latest key technologies: laser micro cutting of polymer foils, laser micro- and sub-micro-structuring of polymer foils, 3D printing of polymer components as well as optical inspection and online process control. The combination of different laser sources, processing optics, inspection systems, and print heads on multiple axes allows the change and exactly positioning to the workpiece during the process. Therewith, the realization of MPS including 3D printed components as well as direct laser interference patterned surfaces for well-defined cell adhesion and product protection is possible. Additional basic technologies for the generation of periodical line-like structures at polycarbonate foils using special Direct Laser Interference Patterning (DLIP) optics as well as for the 3D printing of fluid-tight cell culture reservoirs made of Acrylonitrile Butadiene Styrene directly onto polycarbonate microfluidics were established. A first prototype of the universal micromachining platform combining different lasers with Direct Laser Writing and DLIP is shown. With this laser micro cutting as well as laser micro-structuring of polycarbonate (PC) foils and therewith functionalization for MPS application could be successfully demonstrated.}}, author = {{Moritzer, Elmar and Hirsch, André and Günther, K. and Sonntag, F. and Klotzbach, U. and Lasagni, A.F.}}, journal = {{Micromachines}}, number = {{246}}, publisher = {{MDPI}}, title = {{{Universal Micromachining Platform and Basic Technologies for the Manufacture and Marking of Microphysiological Systems}}}, doi = {{10.3390/mi8080246}}, volume = {{8}}, year = {{2017}}, } @article{22033, abstract = {{The mechanical characterization of fused deposition modeling (FDM) parts is mostly done by static tests. In many applications, parts are also dynamically loaded. Here, fatigue tests can help to identify the expected lifetime of a part. This article discusses the fatigue behavior of FDM specimens manufactured with Ultem 9085. For this, tensile bars are manufactured according to ASTM D638 in different build orientations. Tests are performed in a range of pulsating tensile stresses, and S-N curves are documented for different build orientations. For higher loads, the FDM anisotropy characterizes the lifetime of used specimens, which is similar to static tensile bars. For lower loads, including a higher number of cycles to failure, S-N curves of different build orientations converge. In further tests, tensile bars were chemically smoothed with chloroform vapor. Chemical smoothing reduces surface roughness and increases tensile strength of specimens in the upright build direction. Fatigue tests of chemically treated specimens show no significant lifetime increase.}}, author = {{Fischer, M. and Schöppner, Volker}}, journal = {{JOM: The Journal of The Minerals. Metals & Materials Society (TMS)}}, pages = {{563--568}}, publisher = {{Springer Verlag}}, title = {{{Fatigue Behavior of FDM Parts Manufactured with Ultem 9085}}}, doi = {{10.1007/s11837-016-2197-2}}, year = {{2017}}, } @inproceedings{22023, abstract = {{Fused Deposition Modeling (FDM) is an Additive Manufacturing (AM) technology which is used for prototypes, single-part-production and also small batch productions. For use as a final product, it is important that the parts have good mechanical properties, a high dimensional accuracy and smooth surfaces. The knowledge of the mechanical properties is very important for the design engineer when it comes to the component design. In this paper, investigations were conducted with the polymer ABS-M30 from Stratasys Inc. To achieve a quality improvement of FDM parts, various toolpath parameters and orientations were used. Within the mechanical properties, the tensile, flexural and impact strength were evaluated. Furthermore, the tensile strength of FDM parts is compared to injection molded specimens. With optimized parameters, an increase of the tensile strength by up to 28 % and a doubling of the impact strength were possible.}}, author = {{Knoop, F. and Kloke, A. and Schöppner, Volker}}, booktitle = {{32nd International Conference of the Polymer Processing Society}}, publisher = {{American Institute of Physics}}, title = {{{Quality Improvement of FDM Parts by Parameter Optimization }}}, doi = {{10.1063/1.5016790}}, volume = {{32}}, year = {{2017}}, } @inproceedings{27201, author = {{Schöppner, Volker and Schadomsky, Michael and Walter, J.}}, booktitle = {{25. Fachtagung Technomer}}, location = {{Chemnitz (Deutschland)}}, title = {{{Bestimmung der Mischgüte bei Kautschukstiftextrudern auf Basis experimenteller und simulativer Methoden}}}, year = {{2017}}, } @phdthesis{16068, author = {{Marten, Thorsten}}, isbn = {{9783844055184}}, publisher = {{Shaker Verlag}}, title = {{{Erweiterung des Portfolios presshärtbarer Stähle durch gezielte Werkstoff- und Prozessmodifikationen}}}, year = {{2017}}, } @phdthesis{37564, abstract = {{Die Bedeutung von beanspruchungsangepassten Bauteilen aus metallischer Grundstruktur verstärkt mit einem Faserverbundkunststoff (FVK) steigt im automobilen Leichtbau stark an. Ein Verfahren zur Herstellung dieser hybriden Strukturen ist das Prepreg-Pressen. Bei diesem Verfahren wird der FVK direkt unter Temperatur und Druck auf die metallische Grundstruktur geklebt, wobei es aufgrund der deutlich unterschiedlichen Wärmeausdehnungskoeffizienten zu starken Eigenspannungen im Bauteil kommt. Diese prozessinduzierten Eigenspannungen wurden im Rahmen dieser Arbeit reduziert. Dazu wurde in einem ersten Schritt die Ausgangslage untersucht, indem die Eigenspannungen analytisch berechnet sowie experimentell untersucht wurden. Im zweiten Schritt wurde ein Konzept zur Reduzierung dieser erarbeitet. Hierbei spielt vor allem die Temperaturverteilung im Bauteil eine entscheidende Rolle, die analytisch, numerisch sowie praktisch bestimmt wurde. Im Anschluss wurden die Parameter dieses angepassten Verfahrens optimiert. In weiteren Optimierungsschritten wurde der Einfluss unterschiedlicher Materialien auf die induzierten Eigenspannungen sowie auf die mechanischen Eigenschaften des Gesamtverbundes untersucht. Die Eigenspannungen konnten mithilfe des optimierten Verfahrens deutlich reduziert werden. Abschließend wurden die Ergebnisse in einer Methodik zur Herstellung eigenspannungsoptimierter asymmetrischer Hybride zusammengefasst.}}, author = {{Frantz, Meike Maria}}, isbn = {{978-3-8440-5251-0}}, pages = {{144}}, publisher = {{Shaker Verlag}}, title = {{{Analyse und Optimierung der Delta-Alpha-Problematik im Fertigungsprozess von asymmetrischen hybriden Werkstoffen aus Metall und faserverstärkten Kunststoffen}}}, volume = {{2017,25}}, year = {{2017}}, } @inproceedings{19309, author = {{Penner, Eduard and Caylak, Ismail and Mahnken, Rolf}}, booktitle = {{Proceedings of the 2nd International Conference on Uncertainty Quantification in Computational Sciences and Engineering (UNCECOMP 2017)}}, isbn = {{9786188284449}}, title = {{{MULTIDIMENSIONAL STOCHASTIC MATERIAL MODELING AT LARGE DEFORMATIONS CONSIDERING PARAMETER CORRELATIONS}}}, doi = {{10.7712/120217.5391.16785}}, year = {{2017}}, } @article{19423, author = {{Mahnken, Rolf and Dammann, Christian and Lenz, Peter}}, issn = {{1543-1649}}, journal = {{International Journal for Multiscale Computational Engineering}}, pages = {{295--322}}, title = {{{(n)- AND (n + 1)-LAYERED COMPOSITE SPHERE MODELS FOR THERMO-CHEMO-MECHANICAL EFFECTIVE PROPERTIES}}}, doi = {{10.1615/intjmultcompeng.2017020304}}, year = {{2017}}, } @article{21710, author = {{Dammann, Christian and Lenz, Peter and Mahnken, Rolf}}, issn = {{2212-8271}}, journal = {{Procedia CIRP}}, pages = {{51--56}}, title = {{{Thermo-chemo-mechanical Effective Properties for Homogeneous and Heterogeneous n -Phase Mixtures with Application to Curing}}}, doi = {{10.1016/j.procir.2017.03.360}}, year = {{2017}}, } @inbook{24521, author = {{Uhlmann, E. and Mahnken, Rolf and Ivanov, I. M. and Cheng, C.}}, booktitle = {{Lecture Notes in Production Engineering}}, issn = {{2194-0525}}, title = {{{Thermo-Mechanical Simulation of Hard Turning with Macroscopic Models}}}, doi = {{10.1007/978-3-319-57120-1_7}}, year = {{2017}}, } @inproceedings{27220, author = {{Schöppner, Volker and Lakemeyer, P. and Wübbeke, Andrea and Geißler, S. and Schmidt, M.}}, booktitle = {{70th Annual Assembly of the International Institute of Welding (IIW)}}, location = {{Shanghai (China)}}, title = {{{Investigation of Residual Stress in Laser Transmission Welding of Polypropylene}}}, year = {{2017}}, } @book{45108, author = {{Mahnken, Rolf}}, title = {{{Effective meso properties for fibre reinforced polymer curing}}}, year = {{2017}}, } @article{15961, author = {{Weidenmann, Kay André and Pottmeyer, Florentin and Wang, Zheng and Tröster, Thomas and Meiners, Dieter and Zinn, Carolin and Schaper, Mirko and Gonzalez, Jonathan Serna}}, issn = {{2051-8218}}, journal = {{International Journal of Automotive Composites}}, title = {{{Shear edge tests: a benchmark in investigating the influence of different surface pretreatment methods on the shear stress of intrinsically manufactured metal-CFRP hybrids}}}, doi = {{10.1504/ijautoc.2016.10005303}}, year = {{2017}}, } @article{59977, abstract = {{In the present paper, the crashworthiness of fabric-reinforced thermoplastic composites is experimentally and numerically investigated under axial impact loading. Main aim of this article is the qualification of large-scale producible structures for energy absorbing applications. For this reason, the considerable steps of thermo-forming as well as relevant process parameters are identified. This includes the development of an appropriate handling system for production on lab-scale. Formed three-dimensional profiles are tested under axial impact loading in a drop tower to initiate a continuous progressive crushing mode. Experimental results are analysed and evaluated regarding specific energy absorption (SEA). Numerical analysis by the explicit finite element code LS-Dyna is based on the orthotropic material model MAT54 and a four-layered shell model to implement crushing failure. Investigations show, that energy absorbing structures made of bidirectional organic sheets are suitable for automotive lightweight design.}}, author = {{Striewe, Jan Andre and Reuter, C. and Sauerland, K.-H. and Tröster, Thomas}}, issn = {{0263-8231}}, journal = {{Thin-Walled Structures}}, pages = {{501--508}}, publisher = {{Elsevier BV}}, title = {{{Manufacturing and crashworthiness of fabric-reinforced thermoplastic composites}}}, doi = {{10.1016/j.tws.2017.11.011}}, volume = {{123}}, year = {{2017}}, } @article{41530, author = {{Hengsbach, Florian and Koppa, Peter and Duschik, Kristina and Holzweissig, Martin Joachim and Burns, Madison and Nellesen, Jens and Tillmann, Wolfgang and Tröster, Thomas and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0264-1275}}, journal = {{Materials & Design}}, keywords = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}}, pages = {{136--142}}, publisher = {{Elsevier BV}}, title = {{{Duplex stainless steel fabricated by selective laser melting - Microstructural and mechanical properties}}}, doi = {{10.1016/j.matdes.2017.07.046}}, volume = {{133}}, year = {{2017}}, } @inproceedings{16066, author = {{Ahlers, Dominik and Koppa, Peter and Hengsbach, Florian and Gloetter, P. and Altmann, A. and Schaper, Mirko and Tröster, Thomas}}, booktitle = {{Proceedings of the 28th Annual InternationalSolid Freeform Fabrication Symposium – An Additive Manufacturing Conference}}, location = {{Austin, Texas, USA}}, title = {{{Increasing process speed in the laser melting process of Ti6Al4V and the reduction of pores during hot isostatic pressing}}}, year = {{2017}}, } @article{24108, author = {{Hengsbach, Florian and Koppa, Peter and Duschik, Kristina and Holzweissig, Martin Joachim and Burns, Madison and Nellesen, Jens and Tillmann, Wolfgang and Tröster, Thomas and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0264-1275}}, journal = {{Materials & Design}}, pages = {{136--142}}, title = {{{Duplex stainless steel fabricated by selective laser melting - Microstructural and mechanical properties}}}, doi = {{10.1016/j.matdes.2017.07.046}}, year = {{2017}}, } @inproceedings{62781, author = {{Ostwald, Richard and Bartel, Thorsten and Menzel, Andreas}}, booktitle = {{Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)}}, publisher = {{Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece}}, title = {{{A THERMODYNAMICALLY CONSISTENT FINITE STRAIN MICRO-SPHERE FRAMEWORK FOR PHASE-TRANSFORMATION}}}, doi = {{10.7712/100016.1945.10899}}, year = {{2017}}, } @article{25308, author = {{Ruediger, Arne A. and Bremser, Wolfgang and Strube, Oliver I.}}, issn = {{1547-0091}}, journal = {{Journal of Coatings Technology and Research}}, pages = {{597--611}}, title = {{{The enzyme-mediated autodeposition of casein: effect of enzyme immobilization on deposition of protein structures}}}, doi = {{10.1007/s11998-015-9757-1}}, year = {{2016}}, }