Correction of plane strain compression data for the effects of inhomogeneous deformation

Abstract

Plane strain compression tests to investigate the effects of heterogeneity of deformation on various initial specimen geometries have been carried out. Equations for correction of nominal strain and strain rate to slip line field strain and strain rate have been developed and applied to experimental flow stress-strain data. Investigation of the deformed specimens showed evidence of changing friction conditions during deformation, therefore a simple function allowing friction to change was applied. The corrections eliminate the geometry effect observed in the initial data and lead to modified constitutive equations for flow stress.