The interaction between screw dislocations and an interfacial blunt crack and a sharp crack under loads at infinity was dealt with. Utilizing the Muskhelishvili complex variable method, the closed form solutions were derived. The stress intensity factor and critical stress intensity factor for dislocation emission were also calculated. The results show that the shielding effect increased with the increase of the shear modulus and the distance between the two cracks, but decreased with the increase of dislocation azimuth. The critical loads at infinity for dislocation emission increased with the increment of the emission angle and the distance.

The Interaction between Screw Dislocations and an Interfacial Blunt Crack and a Sharp Crack. H.P.Song, Q.H.Fang, Y.W.Liu: Engineering Fracture Mechanics, 2009, 76[11], 1603-13