自然歪を用いた有限変形の弾塑性解析に関する研究

（順方向後に逆方向の単純剪断の予変形を与えて得られる降伏曲面の形状について）

抄録

The purpose of this study is to elucidate the development of anisotropy in the yield surface by investigating the shape of yield surface which is generated under large deformation. In a series of our studies, focusing on the three types of different pre-deformation, namely, proportional loading of tension and torsion, shear after uniaxial tension and tension after simple shear, the experiments for examining the shape of yield surface have been conducted. From the results of these experiments, it was revealed that the anisotropy of the yield surface is closely related to the pre-deformation that is applied in the latter stage of deformation path. In the present study, the shape of yield surface, which is generated after applying the pre-deformation of simple shear in the reverse direction after forward direction, is examined. Then, the effect of the deformation history in the pre-deformation on the development of anisotropy in yield surface is revealed.