正交各向异性韧性材料的损伤力学

 以含内变量的不可逆热力学基本原理,最小强度原理、正交性流动法则,以及Hill所定义的有效应力等为基础,引入含内损伤变量的比自由能和塑性势,建立了正交各向异性韧性材料的损伤模型和损伤演化方程。并用正交各向异性板材破坏成形的实验数据对本文所建立的损伤演化方程作了验证,结果表明,该模型和损伤演化方程是合理的。

DAMAGE MECHANICS FOR ORTHOGONAL ANISOTROPIC DUCTILE MATERIALS

new damage model and damage evolution equation for anisotropic ductile materials are established by introducing specific free energy and plastic potential with internal damage variable, of which the physical foundations are the principle of irreversible thermodynamics with internal variable, the minimum strength principle, the orthogonal flow rule and the effective stress proposed by Hill for anisotropic materials. The experimental data in the available literature are used to test the new damage evolution equation. It is found that this equation describes the damage evolution in anisotropic materials properly.