Damage analysis of cylindrical test specimens of IS2062: 2006 GR E410W A steel is carried out using the Continuum Damage Mechanics (CDM) model and the ABAQUS/Standard Finite Element (FE) Package. A damage growth law, developed on the basis of the experiments conducted at IIT Kanpur, is used for this purpose. This damage growth law is implemented through a user defined material model subroutine (UMAT).
It is found that both the damage and triaxiality vary in radial as well as in axial directions. The maximum values of these parameters occur at the center of the necked cross-section. The graphs of the true stress verses true strain and the load verses displacement curves are presented. Finally, the variation of the correction factor (i.e., the ratio of the equivalent stress to the axial stress) with equivalent plastic strain is also provided.

Keywords: Continuum Damage Mechanics (CDM), Damage, Ductile fracture, Triaxiality.