Modelling of the evolution of dislocation sheets during strain-path changes and their influence on the Bauschinger effect of B.C.C. polycrystals

摘要

An extension of a full-constraints Taylor model is presented which captures substructural dislocation features, e.g. cell boundaries and cell-block boundaries. This allows coupling the anisotropy due to slip processes, texture and substructure. The extended Taylor model is used to study the dislocation sheets during reverse tests. The evolution of these structures in crystals with stable/unstable orientation is discussed in the context of the Bauschinger effect observed during reverse tests.