Glide and climb stresses on secondary slip systems in F.C.C. crystals due to isolated primary edge and screw dislocations

Abstract

The climb and glide stresses resulting from an isolated 1 2 [ 10] (111) edge dislocation as well as from an isolated 1 2 [ 101] screw dislocation were calculated for all possible 〈110〉 {111} and 〈110〉 {100} slip systems. Knowledge of these stresses is needed in studies of glide on non-primary slips systems as affected by agglomerations of primary dislocations, especially pile-ups, or the loop patches and dipolar walls observed in fatigued specimens. The same data are believed also to be highly applicable to fracture studies in that the stresses about a mode I crack resemble those of a set of edge dislocations along the crack edge with their Burgers vectors normal to the plane of the crack. Similarly, a mode II crack may be simulated by an edge dislocation whose Burgers vector lies in the plane of the crack normal to the crack edge, and amode III crack may be simulated by a screw dislocation.