自然歪を用いた有限変形の弾塑性解析に関する研究

（剪断の予変形後の引張と圧縮の繰り返し荷重下で得られる降伏応力について）

抄録

In our previous studies, the yield stress when the cyclic loads are subjected to the specimens after applying the large pre-deformation has been examined. However, in these studies, the type of pre-deformation and the type of deformation in the cyclic loads are the same, and experiments when these deformation types are different have not been conducted yet. Therefore, in this study, the yield stress generated under cyclic loads of tension and compression after applying large simple shear is examined. As for the estimation method of yield stress in each cycle, the slope of tangent in the deviatoric stress and deviatoric strain curve is used. Then, the variation of yield stress with an increase of the number of cycle is examined under the different size of pre-deformation and strain amplitude. Moreover, the experimental results in this study are compared with previous results, which are obtained under cyclic loads of tension and compression after applying large uniaxial tension.