A new mechanics model, based upon the Peierls concept, was presented which could clearly characterize intrinsic features near to the tip of an interfacial crack. The stress and displacement fields were calculated under general combined tensile and shear loading conditions. The near-tip stress fields exhibited some oscillatory behavior, but without any singularity, and the crack faces opened completely and without any overlapping when the remote tensile loading was comparable to the remote shear loading. A fracture criterion for predicting interface toughness was also proposed which took account of the shielding effects of emitted dislocations. The theoretical toughness curve gave excellent predictions when compared with existing experiment data.

Micromechanics Analyses of Interface Crack. T.Wang: Acta Mechanica Sinica, 1996, 12[1], 47-54