中文摘要：

在前人的基础上引入单位体积微损伤个数概念，从而将宏观损伤参量与微观孔洞体积结合起来，并且在孔洞长大扩展时计入惯性效应的影响，得到了一个新的二次型微孔洞损伤演化方程，指出表面扩张效应和惯性效应分别在孔洞长大的不同阶段起主导作用，最后以921钢板撞击实验为参考，通过比较自由面速度时程曲线，得出的结果与实验相符，验证了本模型的正确性。

英文摘要：

With introducing the concept of the number of micro-damage in unit volume, macro damage parameter and microvoids volume are unified together, and a new kind of quadratic micro-voids damage evolution equation is acquired. The effect of inertia is considered during the expansion of voids. The expansion of surface and inertia will play a dominant role during the different stage of expansion of voids respectively. After taking the impact experiment of 921 steel as reference and comparing the curves of free surface velocity,the model is proved to be correct since their results are matched well.