关键词: 延性损伤, 塑性应变能, 损伤演化方程

Abstract: In this paper, the plastic strain energy that a material absorbs in static loading is used to define the ductile damage variable of the material, which could overcome the limitations of the other definitions and describe all damage changes in the ductile damaging process. The damage variable can be measured easily and accurately under practical conditions. In accordance with the energy definition, the damage evolution equation and the constitutive equation of the damaged material are established, which are identical with the experimental data of a low carbon steel. The damage criterion to which this approach leads is equivalent to the fourth strength theory of material mechanics.

Key words: ductile damage, plastic strain energy, constitutive equation