Discussion: “On Global Energy Release Rate of a Permeable Crack in Piezoelectric Ceramic” (Li, S., 2003 ASME J. Appl. Mech., 70, pp. 246–252)

Abstract

In studying crack problems in a piezoelectric material, many crack models have been proposed and some fracture criteria have been established. The author of 1 presented a new permeable crack model. That is, a permeable crack is modeled as a rectangular hole having height h0. The first-order perturbation solution in terms of small parameter h0 is derived, and asymptotic electroelastic field, together with field intensity factors, local and global energy release rates are further determined. The obtained theoretical prediction agrees basically with experimental observation. Here, we would like to make some discussions on 1.