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本文对由微孔洞定义的损伤D~A和由弹性模量下降定义的损伤D~E进行了分析,发现两者在量值,各向同异性和不可逆性三方面均存在差异,认为它们是两个完全不同的量。文中指出现行损伤理论中的假设和模型是有缺陷的。为此,本文提出了一种二元损伤模型,使得现行损伤理论存在的一些矛盾得到了较为合理的解决。文中还讨论了受损材料的本构方程和两种损伤应变能释放率。
In this paper, the damage D~A defined by the micro hole and the damage D~E defined by the decrease of the elastic modulus are analyzed. It is found that the two are different in terms of magnitude, anisotropy and irreversibility, and they are considered to be different. Are two completely different quantities. The article points out that the assumptions and models in the current damage theory are flawed. For this reason, this paper proposes a binary damage model, which makes some contradictions existing in the current damage theory get a more reasonable solution. The constitutive equation of the damaged material and the two strain energy release rates are also discussed in the paper.