1215 堀・亀田の応力逆解析法による弾塑性応力分布の推定(OS-12D 材料の組織・強度に関するマルチスケールアナリシス(微視的変形組織のキャラクタリゼーション),OS-12 材料の組織・強度に関するマルチスケールアナリシス)

Abstract

The present study has applied Hori and Kameda's stress inversion method to the estimation of elasto-plastic stress distributions in Al-Mg polycrystalline materials. The method can estimate 2D elasto-plastic stress distributions from deformation distributions measured in a structure by using only the elastic moduli of the material of the structure. First, computer codes have been developed based on the present stress inversion method. Then, elasto-plastic 2D FEM analyses of stress concentration problems caused by elliptic holes and rectangular inclusions were made. Comparison of the results obtained by the FEM analyses and the stress inversion method showed that the stress inversion method can estimate elastic and elasto-plastic stress distributions from deformation/strain distributions with reasonable accuracy. Finally, the elasto-plastic stress distributions in Al-Mg were estimated by using deformation distributions measured by the digital image correlation method and it was found that stress concentration occurred near triple junctions of grain boundaries.