混合モード荷重下のき裂先端近傍における延性破壊の有限要素解析

抄録

In ductile fracture, voids near a crack tip play an important role. From this point of view, taking into account the effects of microvoid nucleation and growth, a large deformation finite element analysis has been made to study the deformation, stress and strain, and void ratio near the crack tip under mixed mode plane strain conditions. The result shows that (i) the upper part of a crack tip sharpens while the lower part blunts, (ii) a field near a crack tip can be divided into four characteristic regions (the K field, HRR field, Blunted crack-tip field, and Damaged region), and (iii) the strain and void volume fraction become concentrated in the upper part of a crack tip with an increasing Mode II component.