Damage evolution and multi-scale analysis of carbon fiber-reinforced cross-ply laminate with thermal residual stress

摘要

In order to study the mechanical and thermal properties of carbon fiber-reinforced cross-ply laminate, a macroscopic [90/0](8S) cross-ply laminate model and a unit cell of fiber regular distribution near the [90/0](8S) laminate interlaminar zone with plastic matrix and interface were created. Then the damage initiation discipline details of [90/0](8S) cross-ply laminate are researched, and the effects of interfacial coefficient of thermal expansion on thermal residual stress distribution and damage initiation are researched in detail both based on the macroscopic and microscopic models. It shows that the initial damage of interlaminar interface occurs in macroscopic model and the initial damage in microscopic model occurs both at intralaminar interface and interlaminar cohesive zone. No matter in macroscopic or microscopic model, the residual stress of 6.27x10(-6)/degrees C interfacial coefficient of thermal expansion is larger than that of 6.27x10(-7)/degrees C interfacial coefficient of thermal expansion. And the initial damage expands more widely in the first one.