Long-range internal stresses which arose from the heterogeneity of plastic strain in persistent slip bands were investigated. Persistent slip band stress profiles, as deduced from experimental measurements, were reproduced by making use of a 2-dimensional model which took account of the periodicity of the dislocation arrangements within a persistent slip band. A relatively inhomogeneous distribution of stresses within the channels, and especially within the walls, was already found without taking account of the scatter in stress which was caused by single dislocations and dislocation dipoles. The proposed model was compatible with experimental observations; thus indicating that a spectrum of strain distributions existed in persistent slip band, and that local strains could exceed the constant persistent slip band strain amplitude which was predicted by a 2-phase model.

Strain Localization and Internal Stress Fields in Persistent Slip Bands. M.Hecker, J.Burmeister: Physica Status Solidi A, 1996, 158[1], 87-100