多孔平板における空孔の異方的成長の計測と解析

The effect of microscopic voids to macroscopic mechanical responce is interesting consideration, because ductile fracture is caused by the voids nucreation, growth and coalescence. So this study aims modeling of growth behavior of voids in ductile materials. Perforated sheets are deformed under uniaxial stress condition and progress of growth of holes are measured during examination. In order to represent variation of void shape and arrangement, damage tensor is employed. For the modeling of evolution of damage tensor and stress-strain relationship, anisotropic constitutive equation is presented. This equation is developed by incorporating damage tensor to Gurson’s yield function. Evolution equation is improved so that anisotropic growth of holes can be considered. The presented model shows good agreement for the measurement results using perforated sheet.