@inproceedings{22018, abstract = {{Fused Deposition Modeling (FDM) parts are prone to process-related rough and wavy surfaces with stair-stepping effects whenever the parts produced have sloped or rounded geometries. These stair-stepping effects can be reduced by using a smaller slice height, but complete elimination is not possible. In this paper, FDM parts manufactured with the material ABS-M30 are finished using mass finishing methods. The mass finishing is done with a trough vibrator, which is comparatively gentle to the parts in comparison to other mass finishing technologies. The analysis discusses the surface-smoothing effect of finishing time and intensity on various part sizes and build orientations. In addition, the dimensional accuracy of the parts after the finishing process is examined.}}, author = {{Fischer, M. and Schöppner, Volker}}, booktitle = {{25th Annual International Solid Freeform Fabrication Symposium}}, pages = {{923--934}}, title = {{{Finishing of ABS-M30 Parts Manufactured with Fused Deposition Modeling with Focus on Dimensional Accuracy}}}, doi = {{http://utw10945.utweb.utexas.edu/sites/default/files/2014-073-Fischer.pdf}}, volume = {{25}}, year = {{2014}}, } @article{15966, author = {{Niendorf, Thomas and Leuders, Stefan and Riemer, Andre and Brenne, Florian and Tröster, Thomas and Richard, Hans Albert and Schwarze, Dieter}}, issn = {{1438-1656}}, journal = {{Advanced Engineering Materials}}, pages = {{857--861}}, title = {{{Functionally Graded Alloys Obtained by Additive Manufacturing}}}, doi = {{10.1002/adem.201300579}}, year = {{2014}}, } @article{15967, author = {{Riemer, A. and Leuders, S. and Thöne, M. and Richard, H.A. and Tröster, Thomas and Niendorf, T.}}, issn = {{0013-7944}}, journal = {{Engineering Fracture Mechanics}}, pages = {{15--25}}, title = {{{On the fatigue crack growth behavior in 316L stainless steel manufactured by selective laser melting}}}, doi = {{10.1016/j.engfracmech.2014.03.008}}, year = {{2014}}, } @inproceedings{16097, author = {{Klein, M. and Hülsbusch, D. and Walther, F. and Bartsch, M. and Hausmann, J. and Frantz, M. and Lauter, C. and Tröster, Thomas}}, isbn = {{978-3-88355-402-0}}, location = {{Stade}}, pages = {{188--193}}, title = {{{Characterization of the corrosion influence on the fatigue behavior of intrinsic CFRP-steel-hybrids}}}, year = {{2014}}, } @inproceedings{16099, author = {{Frantz, M and Lauter, Christian and Tröster, Thomas and Hausmann, J. and Bartsch, M. and Hülsbusch, D and Walther, F.}}, isbn = {{978-3-88355-400-6}}, location = {{Stuttgart}}, title = {{{Efficient manufacturing of hybrid structures consisting of steel and CFRP with using residual heat / Effiziente Herstellung von Hybridbauteilen aus Stahl und CFK mithilfe von Restwärmeausnutzung}}}, year = {{2014}}, } @inproceedings{16120, author = {{Block, Holger and Marten, Thorsten and Tröster, Thomas}}, location = {{Braunschweig}}, title = {{{Crash simulation of high strength automotive components using advanced failure models}}}, year = {{2014}}, } @article{16122, author = {{Lauter, Christian and Niewel, Joerg and Tröster, Thomas}}, issn = {{2051-8218}}, journal = {{International Journal of Automotive Composites}}, title = {{{Quasistatic and crash tests of steel-CFRP hybrid pillar structures for automotive applications}}}, doi = {{10.1504/ijautoc.2014.064127}}, year = {{2014}}, } @phdthesis{16127, author = {{Lauter, Christian}}, isbn = {{978-3-8440-2996-3}}, publisher = {{Shaker Verlag}}, title = {{{Entwicklung und Herstellung von Hybridbauteilen aus Metallen und Faserverbundkunststoffen für den Leichtbau im Automobil}}}, volume = {{4}}, year = {{2014}}, } @inproceedings{16128, author = {{Block, Holger and Marten, Thorsten and Weiß Borkowski, Nathalie and Tröster, Thomas}}, location = {{Hohenkammer}}, title = {{{Crash performance of the new press hardenable steel 15MnB6}}}, year = {{2014}}, } @inproceedings{16129, author = {{Reuter, Corin and Flore, Dominik and Pöhler, Simon and Sauerland, Kim Henning and Tröster, Thomas}}, location = {{Leipzig}}, title = {{{Numerical simulation of the energy absorption of fiber-reinforced plastics}}}, year = {{2014}}, } @inproceedings{16255, author = {{Leuders, S. and Riemer, A. and Richard, H. A. and Tröster, Thomas and Niendorf, T.}}, location = {{Erlangen, Germany}}, title = {{{Selective-Laser-Melting materials under cyclic loading: Influence of process-inherent defects on the initiation and propagation of fatigue cracks}}}, year = {{2014}}, } @inproceedings{16256, author = {{Leuders, S. and Tröster, Thomas and Brenne, F. and Riemer, A. and Richard, H. A. and Niendorf, T.}}, location = {{San Francisco, California, USA}}, title = {{{Evaluation of the effect of defects on the mechanical performance of components manufactured by selective laser melting}}}, year = {{2014}}, } @inproceedings{16257, author = {{Leuders, S. and Tröster, Thomas and Riemer, A. and Richard, H. A. and Niendorf, T.}}, location = {{Orlando, Florida, USA}}, title = {{{On the mechanical performance of structures manufactured by selective laser melting: Damage initiation and propagation}}}, year = {{2014}}, } @inproceedings{22030, abstract = {{Parts produced by Fused Deposition Modeling (FDM) tend to have rough and undulating surfaces with staircase effects on rounded and slanting areas of the part. This is due to the characteristics of the process. In many fields of application, high demands are made on the optical quality of the part. An improvement in the surface quality of FDM parts made of Ultem*9085 can be achieved through post-treatment with a mass finishing process. In this paper, FDM specimens are post-treated in a disk finishing unit. Influences of the mass finishing process are analyzed with regard to the dependence of surface quality on the various process parameters and on the finishing medium, grinding time and grinding speed. The finishing efficiency depends on the finishing media and decreases for lower finishing time. For all media a lower disk velocity results a smaller grinding effect, but there are clearly differences between the finishing media. The paper also discusses effects of the grinding process on the mechanical properties of the parts. Especially small part geometries and parts build in z-direction tend to break during the finishing process.}}, author = {{Fischer, M. and Schöppner, Volker}}, booktitle = {{ANTEC}}, isbn = {{978-1-63439-708-7}}, pages = {{2331--2336}}, publisher = {{SPE: Society of Plastics Engineers}}, title = {{{Effects of a mass finishing process on parts produced from Ultem 9085 by Fused Deposition Modeling}}}, year = {{2014}}, } @inproceedings{22021, abstract = {{Additive production techniques have the advantage of manufacturing parts without needing a forming tool. One of the most used additive manufacturing processes is "Fused Deposition Modeling" (FDM) which allows the production of prototypes and end-use parts. Due to the manufacture layer by layer, also complex part geometries can be created in one working step. Furthermore, lightweight parts with specific inner core structures can be manufactured in order to achieve good weightrelated strength properties. In this paper the mechanical behavior of lightweight parts manufactured with the 3D production system Fortus 400mc from Stratasys and the material Polyetherimide (PEI) with the trade name Ultem*9085 is analyzed. The test specimens were built up with different inner structures and building directions. Therefore, test specimens with known lightweight core geometries (e.g. corrugated and honeycomb cores) were designed. A four-point bending test was conducted to analyze the strength properties as well as the weight-related strength properties. Additionally the influence of the structure width, the structure wall thickness and the top layer thickness was analyzed using a honeycomb structure.}}, author = {{Bagsik, A. and Josupeit, S. and Schöppner, Volker and Klemp, E.}}, booktitle = {{29th International Conference of the Polymer Processing Society}}, pages = {{696--701}}, publisher = {{American Institute of Physics }}, title = {{{Mechanical Analysis of Lightweight Constructions manufactured with Fused Deposition Modeling}}}, doi = {{10.1063/1.4873874}}, volume = {{29}}, year = {{2014}}, } @article{15965, abstract = {{Abstract}}, author = {{Leuders, Stefan and Lieneke, Tobias and Lammers, Stefan and Tröster, Thomas and Niendorf, Thomas}}, issn = {{0884-2914}}, journal = {{Journal of Materials Research}}, pages = {{1911--1919}}, title = {{{On the fatigue properties of metals manufactured by selective laser melting – The role of ductility}}}, doi = {{10.1557/jmr.2014.157}}, year = {{2014}}, } @article{24708, author = {{Widany, Kai-Uwe and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{273--274}}, title = {{{Approximation of the dual problem for error estimation in inelastic problems}}}, doi = {{10.1002/pamm.201410124}}, year = {{2014}}, } @article{24702, author = {{Cheng, Chun and Mahnken, Rolf and Uhlmann, Eckart and Ivanov, Ivan Mitkov}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{419--420}}, title = {{{Macroscopic and mesoscopic modeling based on the concept of generalized stresses for cutting simulation}}}, doi = {{10.1002/pamm.201410197}}, year = {{2014}}, } @article{24701, author = {{Dammann, Christian and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{387--388}}, title = {{{A macroscopic consitutive model on induced anisotropy for polymers with weighting functions}}}, doi = {{10.1002/pamm.201410181}}, year = {{2014}}, } @article{24707, abstract = {{Abstract The alignment of polymer chains is a well known microstructural evolution effect due to straining of polymers. This has a drastic influence on the macroscopic properties of the initially isotropic material. In this work, cold forming is performed at room temperature on a tensile testing machine. Polycarbonate films are examined in two loading phases. In the first phase, the specimen is loaded to induce anisotropy, and in the second, it is re-loaded, while the material direction is varied. The investigations are supported by an optical measurement system to gain knowledge about the inhomogeneous material behavior in the initial loading phase and about the anisotropic homogeneous behavior during the re-loading phase. Two dimensional strain contours are obtained from the test data. Additionally, we propose a method for approximation of the macroscopic true stress and compare the results with a common approach based on volume consistency. In the future, the test data will set a basis for parameter identification of constitutive equations taking into account a combination of inhomogenous and homogenous material behavior, exhibiting strain induced anisotropy.}}, author = {{Dammann, C. and Caylak, Ismail and Mahnken, Rolf}}, issn = {{2195-8602}}, journal = {{International Polymer Processing}}, pages = {{260--271}}, title = {{{Experimental Investigation of PC-Films Using Optical Measurements}}}, doi = {{10.3139/217.2848}}, year = {{2014}}, }