Abstract
The void damage theory can express quantitatively the growth and coalescence of voids which are inherently included in any material and are caused by the accumulated microcrack. In this paper, 2-dimensional deformation analysis by the elasto-plastic FEM is carried out to show some numerical examples for the relationships between initial value of void volume fraction and the deterioration of overall stiffness. From this result, an estimation method of material deterioration is presented to evaluate the damage of materials.
