METHOD FOR PREDICTING A CREEP FRACTURE BEHAVIOR OF WOVEN CERAMIC MATRIX COMPOSITE MATERIAL CONSIDERING RANDOM LOAD EFFECT

摘要

A method for predicting a creep fracture behavior of a woven ceramic matrix composite is provided. A fiber axial stress distribution equation is obtained according to a shear lag model, a random matrix cracking model, a fracture mechanical interface debonding criterion and a fiber failure model; a matrix crack spacing equation is obtained according to the random matrix cracking model; an interface debonding length equation is obtained according to the fracture mechanics interface debonding criterion, and an equation of the load bearing relationship between intact fibers and broken fibers and a fiber fracture probability equation are obtained based on an overall load bearing criterion; and at last a creep strain equation of the woven ceramic matrix composite material is obtained, according to the overall load bearing criterion, to predict the creep fracture behavior of the woven ceramic matrix composite material affected by the random load.