复合材料损伤破坏判据适用性的实验研究

 <正> 一、复合材料损伤力学和损伤应变能释放率（y₂）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（y₂）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

EXPERIMENTAL STUDY ON APPLICABILITY OF DAMAGE FAILURE CRITERION FOR COMPOSITES

In this paper the development of damage mechanics of composite materials and the damage strain enefgy release rate (y) failure criterion are presented briefly. In order to further verify the applicability of the damage strain energy release rate criterion, the authors carried out uniaxial tensile damage tests on two commonly-used graphite/648 epxy laminates-0/90] and 0/±45/90] using about 120 specimens with different shapes and sizes of initial notches. All of these experimental results varified that the damage strain energy release rate failure criterion does reflect the failure regularity of composite laminates.