2603 SEM・EBSD実験計測に基づく微視結晶体代表体積要素の導出(S18-1 組織変化と強度,S18 材料の強度と組織)

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In this study, the multi scale analysis code is developed by employing a three dimensional (3D) micro polycrystal structure representative volume element (RVE). These were applied to predict the plastic strain induced yield loci in the macro scale, and simultaneously the crystal texture evolution in the micro scale. We measure crystal morphologies by using the SEM-EBSD apparatus with a unit of about 3.8μm voxel, and define a three dimensional (3D) representative volume element (RVE) for the micro polycrystal structure, which satisfies the periodicity condition of crystal orientation distribution. Next, the "semi-implicit" crystallographic homogenization FE code, which employs the SEM-EBSD measured RVE, is applied to automotive sheet metals to predict the texture evolution and the subsequent yield loci in the various strain paths. These "semi implicit" FE results reveal that the plastic strain induced anisotropy in the micro and macro levels can be predicted by our FE analyses.
2006-09-15