FINITE ELEMENT ANALYSIS FOR COMPRESSION BEHAVIOR OF HIGH PRESSURE TORSION PROCESSING

Abstract

In this study, plastic deformation behavior of commercially pure copper, during a compression stage of the high pressure torsion (H PT) process, was employed using the finite element method. Numerical simulations dealt with a phenomenological constitutive model based on dislocation density evolutions. After the compression, the effective strains reached locally over 2 and the effective stress was approximately 500 MPa. These stress and strain values during the compression are sufficiently high for grain refinement by severe plastic deformation and for hardening of the material. The compression stage should be considered for the theoretical as well as experimental analyses of the HPT process.