Shear band instabilities in compacted metal powder with or without interparticle cohesion

A simple model for analysis of shear band development in uniformly strained solids is used to study the possibility of flow localization during metal powder compaction. Earlier analyses for a metal powder with full interparti cle cohesion have predicted no localization. Here, a material model is used , in which the value of a cohesion factor is used to represent either cohes ionless powder or powder with a certain amount of cohesion. It is found tha t localization under compaction depends strongly on the cohesion factor, th e stress state, and the magnitude of an initial imperfection.