Abstract
In this paper, constitutive equation to describe electric yielding behavior of a piezoelectric material is given out first. Then, the characteristics of ε_J-integral, that is, path-independent expression of CED when electric yielding is considered are discussed and, in the light of ε_J-integral, the physical meaning and applicable ranges of J-integral is clarified. Finally, how electric yielding influences fracture load estimation is fundamentally studied.
