Damage evolution of metallic materials during
high temperature plastic deformation
high temperature plastic deformation
(1. College of Materials Science and Engineering,
Chongqing University, Chongqing 400044, China;
2. Department of Metal Materials Engineering,
Sichuan University, Chengdu 610065, China)
Chongqing University, Chongqing 400044, China;
2. Department of Metal Materials Engineering,
Sichuan University, Chengdu 610065, China)
Abstract: The damage evolution of high temperature plastic deformation of metallic materials was studied by use of continuum damage mechanics (CDM) theory. Based on thermodynamics, on a damage variable D and Zener-Hollomon parameter Z, and on the effective stress concept, a damage evolution model of high temperature plastic deformation was derived and was used to analyze the damage evolution of 1420 Al-Li alloy during high temperature plastic deformation. The model that is verified by tests can also be applied to the materials that are loaded prorata or out of proportion during high temperature plastic deformation. It extends the applied scope of damage mechanics.
Key words: damage mechanics; Zener-Hollomon parameter; damage variable