The effect of T stress on the near tip stress field of an elastic-plastic interface crack

Recently the authors have shown that the near tip stress field of a plastically dissimilar bimaterial interface crack can be characterized by two parameters, J and M, where J is the J integral, M is a material mismatch constraint parameter. In the J-M formulation, small scale yielding conditions with zero T stress are enforced. In this study, the effect of T stress on the near tip stress field of the interface crack has beer, investigated. It is found that for a given material mismatch, the T stress shifts the near tip stress level of the interface crack up and down without significantly affecting the M. This observation suggests that the effect of T stress and material mismatch on the crack tip can be separated. Based on this observation, a J-Q-M formulation is presented.