Abstract
Numerical models of face centered cubic single crystals, in which the condition for plastic slip is spacially non-uniform, have been developed. Tensile deformations of the models have been analysed by the finite element method. The evolutions of deformation bands from the initial non-uniformity and the characteristics of disordered stress field caused by non-uniform slip have been discussed. The results are as follows:
(1) non-uniformity in the distribution of the initial dislocation density caused the generation of a kink band even if the non-uniformity is very slight.
(2) a band of secondary slip is formed when the non-uniformity in the distribution of shear strain on the primary slip system reaches a certain value which is supposed to depend on the crystal orientation.
On the basis of the results of disordered stress field analyses, the reason for which the kink band and the band of secondary slip are formed in a specific direction has been discussed.
