@inproceedings{23588, author = {{Pottebaum, Jens and Gräßler, Iris}}, booktitle = {{LEAN SMART MAINTENANCE - Konzepte, Instrumente und Anwendungen für eine effiziente und intelligente Instandhaltung}}, pages = {{49--59}}, title = {{{Szenarien für die Anwendung von Additive Manufacturing in der Instandhaltung}}}, year = {{2016}}, } @book{26113, abstract = {{In the polymer laser sinter process, part quality depends on many influencing factors along the process chain. For application of the technology in series production and an integration of laser sintered parts into a technical environment, the dimensional accuracy of parts has to be taken into account. Therefore, occurring deviations of the process have to be known to define tolerances for part design. Dimensional deviations and their scattering have to be reduced and homogenized based on process parameters and build job layout. In this work, the dimensional accuracy of laser sintered parts is analyzed for varied parameter values. Influences of different process and geometrical build job parameters on dimensional deviations are figured out. The experimental results allow an evaluation of more and less important influences. Finally, measures are deduced to reduce and homogenize dimensional deviations.}}, editor = {{Kniffka, Wieland and Eichmann, Michael and Witt, Gerd and Josupeit, S. and Delfs, P. and Lieneke, Tobias and Adam, G. and Schmid, Hans-Joachim}}, isbn = {{978-3-446-45017-2}}, title = {{{Geometrische Genauigkeit von Lasersinter-Bauteilen: Einflüsse und Maßnahmen / Dimensional accuracy of polymer laser sintered parts: Influences and measures}}}, doi = {{10.3139/9783446450608.009}}, year = {{2016}}, } @article{21947, abstract = {{Wall slip is a long-known phenomenon in the field of rheology. Nevertheless, the origin and the evolution are not completely clear yet. Regarding suspensions, the effect becomes even more complicated, because different mechanisms like pure slip or slip due to particle migration have to be taken into account. Furthermore, suspensions themselves show many flow anomalies and the isolation of slip is complicated. In order to develop working physical models, further insight is necessary. In this work, we measured experimentally the wall slip velocities of different highly filled suspensions in a rectangular slit die directly with respect to the particle concentration and the particle size. The slip velocities were obtained using a particle image velocimetry (PIV) system. The suspensions consisting of a castor oil–cinnamon oil blend and PMMA particles were matched in terms of refractive indexes to appear transparent. Hereby, possible optical path lengths larger than 15 mm were achieved. The slip velocities were found to be in a quadratic relation to the wall shear stress. Furthermore, the overall flow rate as well as the particle concentration has a direct influence on the slip. Concerning the shear stress, there seem to be two regions of slip with different physical characteristics. Furthermore, we estimated the slip layer thickness directly from the velocity profiles and propose a new interpretation. The PIV technique is used to investigate the viscosity and implicit the concentration profile in the slit die. It is shown that the particle migration process is quite fast.}}, author = {{Jesinghausen, Steffen and Weiffen, Rene and Schmid, Hans-Joachim}}, issn = {{0723-4864}}, journal = {{Experiments in Fluids}}, keywords = {{Rheology, Wall Slip, Slip, apparent slip, suspension}}, title = {{{Direct measurement of wall slip and slip layer thickness of non-Brownian hard-sphere suspensions in rectangular channel flows}}}, doi = {{10.1007/s00348-016-2241-6}}, year = {{2016}}, } @phdthesis{37567, abstract = {{Die zunehmend eingesetzten hochfesten Stähle im Automobilbau können zu schwerwiegenden Problemen bei Verkehrsunfällen führen, da hydraulische Schneidgeräte zur Befreiung von Personen an ihre mechanischen Grenzen geraten. Ein Ansatz zur Behebung dieses Problems kann die Widerstandserwärmung der zu schneidenden Werkstoffe sein. Im Rahmen dieser Dissertation wurde durch Werkstoffuntersuchungen ermittelt, dass die hochfesten Stähle einen starken Abfall der Festigkeit aufweisen, während bei denselben Temperaturen potentielle Schneidwerkstoffe deutlich höhere Festigkeiten besitzen. Das Konzept wurde schließlich in einem Funktionsmuster umgesetzt. Schneidversuche zeigten, dass durch die Widerstandserwärmung ein deutlicher Abfall der erforderlichen Schneidkraft erreicht werden konnte. Insgesamt konnte gezeigt werden, dass die Widerstandserwärmung ein vielversprechendes Konzept darstellt, um hochfeste Karosseriestähle zuverlässig und schnell zu durchtrennen und somit die Befreiung eingeschlossener Fahrzeuginsassen zu gewährleisten. }}, author = {{Siewers, Bernd}}, isbn = {{978-3-8440-4913-8}}, keywords = {{Leichtbau, Hybridsysteme, Werkstoffe}}, pages = {{186}}, publisher = {{Shaker Verlag}}, title = {{{Einsatz der Widerstandserwärmung bei hydraulischen Schneidgeräten zum Trennen von hochfesten Stahlwerkstoffen in Kraftfahrzeugen}}}, volume = {{2016,21}}, year = {{2016}}, } @article{24644, abstract = {{This paper presents a numerical method for solution of a stochastic partial differential equation (SPDE) for a linear elastic body with stochastic coefficients (random variables and/or random fields). To this end the stochastic finite element method (SFEM) is employed, which uses W IENER’S polynomial chaos expansion in order to decompose the coefficients into deterministic and stochastic parts. As a special case, we consider isotropic material behavior with two fluctuating parameters. Computational approaches involving GALERKIN projection are applied to reduce the SPDE into a system of deterministic PDEs. Furthermore, we consider normally distributed random variables, which are assumed to be stochastically independent, and which establish the number of stochastic dimensions. Subsequently, the resulting finite element equation is solved iteratively. Finally, in a representative example for a plate with a ring hole we study the influence of different variances for material parameters on the variances for the finite element results.}}, author = {{Mahnken, Rolf and Caylak, Ismail and Dridger, Alex}}, journal = {{A Stochastic Finite Element Method with a Deviatoric-volumetric Split for the Stochastic Linear Isotropic Elasticity Tensor}}, title = {{{A Stochastic Finite Element Method with a Deviatoric-volumetric Split for the Stochastic Linear Isotropic Elasticity Tensor}}}, doi = {{10.24352/UB.OVGU-2017-003}}, year = {{2016}}, } @article{24647, author = {{Ehlenbröker, Ulrich and Mahnken, Rolf and Petersmann, M and Antretter, T}}, issn = {{1757-8981}}, journal = {{IOP Conference Series: Materials Science and Engineering}}, title = {{{Modeling of variant-interaction during bainitic phase transformation}}}, doi = {{10.1088/1757-899x/119/1/012016}}, year = {{2016}}, } @article{24642, author = {{Cheng, C. and Mahnken, Rolf}}, issn = {{0020-7683}}, journal = {{International Journal of Solids and Structures}}, pages = {{127--141}}, title = {{{Extension of a multi-mechanism model: Hardness-based flow and transformation induced plasticity for austenitization}}}, doi = {{10.1016/j.ijsolstr.2016.10.010}}, year = {{2016}}, } @article{26269, author = {{Schneidt, Andreas and Mahnken, Rolf}}, issn = {{1611-3683}}, journal = {{steel research international}}, pages = {{116--123}}, title = {{{Macromodelling of Transformation Induced Plasticity combined with Viscoplasticity for Low-Alloy Steels}}}, doi = {{10.1002/srin.200806326}}, year = {{2016}}, } @article{24646, author = {{Dammann, Christian and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{517--518}}, title = {{{Determination of effective properties for CFRP curing coupled to viscoleasticity based on a three-scale framework}}}, doi = {{10.1002/pamm.201610247}}, year = {{2016}}, } @article{24645, author = {{Düsing, Martin and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{321--322}}, title = {{{A thermodynamic framework for coupled multiphase field and diffusion models for lower bainite transformation}}}, doi = {{10.1002/pamm.201610149}}, year = {{2016}}, } @article{24643, author = {{Ju, Xiaozhe and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{527--528}}, title = {{{Two accuracy improvements on nonuniform transformation field analysis for plasticity coupled to softening}}}, doi = {{10.1002/pamm.201610252}}, year = {{2016}}, } @article{24652, author = {{Düsing, Martin and Mahnken, Rolf}}, issn = {{0939-1533}}, journal = {{Archive of Applied Mechanics}}, pages = {{1947--1964}}, title = {{{A thermodynamic framework for coupled multiphase Ginzburg-Landau/Cahn-Hilliard systems for simulation of lower bainitic transformation}}}, doi = {{10.1007/s00419-016-1161-5}}, year = {{2016}}, } @article{24651, author = {{Mahnken, Rolf and Dammann, Christian}}, issn = {{0020-7683}}, journal = {{International Journal of Solids and Structures}}, pages = {{356--375}}, title = {{{A three-scale framework for fibre-reinforced-polymer curing part II: Mesoscopic modeling and macroscopic effective properties}}}, doi = {{10.1016/j.ijsolstr.2016.09.005}}, year = {{2016}}, } @article{24655, author = {{Mahnken, Rolf and Dammann, Christian}}, issn = {{0020-7683}}, journal = {{International Journal of Solids and Structures}}, pages = {{341--355}}, title = {{{A three-scale framework for fibre-reinforced-polymer curing Part I: Microscopic modeling and mesoscopic effective properties}}}, doi = {{10.1016/j.ijsolstr.2016.09.003}}, year = {{2016}}, } @article{24654, author = {{Ju, X. and Mahnken, Rolf}}, issn = {{0167-6636}}, journal = {{Mechanics of Materials}}, pages = {{106--125}}, title = {{{An NTFA-based homogenization framework considering softening effects}}}, doi = {{10.1016/j.mechmat.2016.01.007}}, year = {{2016}}, } @article{24653, author = {{Mahnken, Rolf and Cheng, Chun and Düsing, Martin and Ehlenbröker, Ulrich and Leismann, Thorben}}, issn = {{0936-7195}}, journal = {{GAMM-Mitteilungen}}, pages = {{229--265}}, title = {{{The concept of generalized stresses for computational manufacturing and beyond}}}, doi = {{10.1002/gamm.201610014}}, year = {{2016}}, } @article{19128, author = {{Caylak, Ismail and Nörenberg, Nicole and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{191--192}}, title = {{{PC expansion for material parameters using artificial data and statistical methods}}}, doi = {{10.1002/pamm.201610084}}, year = {{2016}}, } @article{19117, author = {{Dridger, Alex and Caylak, Ismail and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{667--668}}, title = {{{A linear elastic Fuzzy Finite Element Method with two fuzzy input parameters}}}, doi = {{10.1002/pamm.201610322}}, year = {{2016}}, } @article{19127, author = {{Penner, Eduard and Caylak, Ismail and Nörenberg, Nicole and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{675--676}}, title = {{{SFEM for rubber-like materials at large deformations}}}, doi = {{10.1002/pamm.201610326}}, year = {{2016}}, } @book{19327, author = {{Mahnken, Rolf}}, isbn = {{9783662527849}}, title = {{{Lehrbuch der Technischen Mechanik - Band 1: Starrkörperstatik}}}, doi = {{10.1007/978-3-662-52785-6}}, year = {{2016}}, }