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Effects of grain size distribution and stress heterogeneity on yield stress of polycrystals: A numerical approach

Abstract : This paper addresses the relation between the grain size distribution, the elastic stress field fluctuations and the description of incipient plasticity in polycrystals with local elastic anisotropy. We propose a numerical approach based on full-field computations on polycrystalline microstructures. The generation of microstructures with prescribed grain size distribution and grain shape is made by combining dense-sphere packing with Power diagrams. By using a local plastic criterion based on the stress field statistics, it is shown that the macroscopic Hall-Petch relation significantly depends on the grain size distribution and the stress heterogeneity. Previous results of the literature obtained with mean-field approaches are confirmed by our study. © 2013 Elsevier Ltd. All rights reserved.
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Submitted on : Thursday, February 13, 2014 - 1:53:42 PM
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F. Lavergne, R. Brenner, Karam Sab. Effects of grain size distribution and stress heterogeneity on yield stress of polycrystals: A numerical approach. Computational Materials Science, Elsevier, 2013, 77 (-), pp.387-398. ⟨10.1016/j.commatsci.2013.04.061⟩. ⟨hal-00946087⟩

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