期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 42, 期 20, 页码 5441-5459出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2005.02.051
关键词
polycrystals; antiplane shear; homogenization; stress fluctuations
类别
The effective behavior and the distribution of local mechanical fields of linearly viscous 2-D polycrystals under anti-plane shear is investigated. Several microstructures are considered, and a full-field approach based on the Fast Fourier Transform technique is applied. First, the accuracy of this technique is evaluated on a strictly isotropic 2-phase microstructure. Voronoi tessellation is then used to generate artificial microstructures, and a real (fully recrystallized) polycrystalline microstructure is obtained by electron back-scattering diffraction. Ensemble averages over several configurations using eight crystalline orientations (phases) are performed. Although a slight anisotropy is obtained for the effective behavior of each individual configuration, statistically, the results are in very good agreement with the available analytical isotropic solution. At phase level, a marked asymmetry is obtained for the distribution of local stresses. The intraphase first- and second-order moments of the stress field, calculated for both microstructures are compared with corresponding self-consistent predictions. Published by Elsevier Ltd.
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