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Edge dislocations emitted along inclined planes from a mode I crack

1988; Elsevier BV; Volume: 104; Linguagem: Inglês

10.1016/0025-5416(88)90410-7

1873-4936

V. Lakshmanan, J.C.M. Li,

Mechanical stress and fatigue analysis

The stress field around the tip of a semi-infinite crack with an edge dislocation parallel to the tip but located in any nearby position has been obtained in closed form. Using this, the equilibrium positions under mode I loading of an array of edge dislocations emitted from the crack tip on a slip plane oriented at an angle to the crack plane were obtained numerically. A dislocation-free zone (DFZ) was found to exist if the slip plane was not saturated with dislocations. The DFZ disappeared at saturation. The case of two arrays emitted on two symmetrically oriented slip planes was studied also. The effects of the applied stress, the angle of inclination of the slip plane, the lattice friction for dislocation motion and the number of dislocations in the plastic zone are presented.