Papers by Keyword: Uniaxial Deformation

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Authors: Nishant Kumar, Olukayode I. Imole, Vanessa Magnanimo, Stefan Luding
Abstract: The challenge of dealing with cohesive powders during storage, handling and transport are widely known in the process and pharmaceutical industries. Simulations with the discrete element method (DEM) provide further insight into the local microstructure of bulk materials. In this work, the DEM approach is presented to investigate the flow behavior of granular systems subjected to different modes of deformations. When uniaxial compression is applied of frictionless, polydisperse spheres above jamming (transition from fluid-like state to solid-like state), the evolution of coordination number (average number of contacts per particle) and pressure as functions of the volume fraction are, astonishingly, identical to results obtained for purely isotropic compression. Analytical predictions for the evolution of pressure and coordination number under isotropic strain can thus be separated from different deformation modes, as applied in this study. After two different modes of volume-conserving deviatoric shear, the results still compare quite well with results for purely isotropic compression. The difference between the two deviatoric modes and uniaxial deformation is examined with respect to the anisotropic stress response as a function of deviatoric strain.
160
Authors: A. A. Abramov, V.I. Akimov, A.T. Dalakyan, V.N. Tulupenko, A.M. Zaitcev, S.N. Danilov, D.A. Firsov, V.A. Shalygin
283
Authors: Ru Lin Peng, J. Gibmeier, Sebastian Eulert, Sten Johansson, Guo Cai Chai
Abstract: The deformation behaviour of the super duplex stainless steel SAF2507 (UNS S32750) under successive uniaxial tensile loading-unloading was investigated with respect to load sharing and inter-phase interactions. The steel consists of 58% austenite and 42% ferrite in volume. By insitu X-ray diffraction experiment the evolution of phase-specific stresses with applied load was monitored for three successive loading-unloading cycles with the maximum total strains being 0.34%, 0.75% and 1.63%, respectively. It was found that yielding occurred earlier in the austenitic phase than in the ferritic phase during the first loading cycle. In the followed loading cycles, both phases yielded under larger but similar applied stresses. Due to a similar behavior of the phases in the elasto-plastic regime inter-phase interactions were relatively weak. Low microstresses induced by the plastic straining resulted in somewhat larger stresses in the ferritic phase.
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Authors: Talal Al-Samman, Bashir Ahmad, Günter Gottstein
Abstract: Texture evolution and microstructure development of hot extruded magnesium alloy AZ31 deformed by PSC and uniaxial deformation at select temperatures and a constant strain rate of 10-4 s-1 were investigated and compared using X-ray techniques, electron back scattered diffraction (EBSD) and optical microscopy. At a deformation temperature of 200 °C both deformation routes resulted in a similar crystallographic texture and showed a heterogeneous microstructure consisting of highly deformed zones appearing as huge and/or elongated grains containing twins and shear bands embedded in a very fine-grained microstructure. High temperature deformation (400 °C) gave rise to completely different deformation textures for the two processes. Uniaxial deformation tended to randomize the initial extrusion texture, whereas in PSC a prismtexture {10-10}<11-20> prevailed. The flow stress was found to be strongly dependent on loading conditions and deformation modes.
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