Investigated was the problem of the interaction between a moving screw dislocation and an interfacial crack in two orthotropic materials. The closed form solutions of this problem was obtained by using Riemann-Schwarz’s symmetry principle integrated and the analysis singularity of complex functions. The stress intensity factors and the strain energy density factors were investigated, the angle of crack initiation was found. The results show that the shielding effect of dislocation for crack tips decreased with the increase of the distance between dislocation and crack tip and tends to zero at infinite, in additional, larger dislocation velocity led to shielding effect waning. The normalized minimum SEDF increased with decrease of the velocity of dislocation and the distance between dislocation and crack tip and the ratio of shear modulus. The presented solutions contained previously known results as the special cases.

Cracking Characteristics of a Moving Screw Dislocation Near an Interfacial Crack in Two Dissimilar Orthotropic Media. C.Xie, Y.W.Liu: Theoretical and Applied Fracture Mechanics, 2008, 50[3], 214-9