一、复合材料损伤力学和损伤应变能释放率(y_2)破坏判据 作者近年来采用复合材料损伤力学研究方法对复合材料层板进行了理论与实验研究,提出了损伤应变能释放率(y_2)破坏判据,简述如下。 基于J.P.Cordebois等人提出的能量等效性假设,并引入有效应力概念,可导出损伤变量和损伤应变能释放率的表达式。在一维加载条件下它们的表达式分别为 First, the damage mechanics and damage energy of the composite material damage damage criterion (y_2) In recent years, the composite material damage mechanics research methods of composite laminates theoretical and experimental study, the damage strain energy release rate (y_2) Destruction criterion, summarized as follows. Based on the hypothesis of energy equivalence proposed by J.P. Cordebois et al. And introducing the concept of effective stress, expressions of damage variables and damage energy release rate can be deduced. Under one-dimensional loading conditions, their expressions are