Affiliation of Author(s):民航学院

Journal:MECHANICS OF COMPOSITE MATERIALS

Key Words:ceramic-matrix composites cross-ply composite hysteresis loop matrix multicracking

Abstract:The effect of matrix multicracking on the stress-strain hysteresis loops of cross-ply C/SiC ceramic-matrix composites (CMCs) under cyclic loading/unloading was investigated. When matrix multicracking and fiber/matrix interface debonding occur in the 0A degrees plies, fiber slipping relative to the matrix in the debonded region of interface is the mainly reason for occurrence of the loops. The interfacial slip lengths, i.e., the debonded lengths of interface are determined, with consideration of matrix multicracking in the 90A degrees and 0A degrees plies, by using the fracture mechanics approach. The effects of peak stress, fiber volume content, fiber/matrix interfacial shear stress, and number of cycles on the hysteresis loops are analyzed. The stress-strain hysteresis loops of cross-ply C/SiC composites corresponding to different peak stresses and numbers of cycles are predicted.

ISSN No.:0191-5665

Translation or Not:no

Date of Publication:2017-01-01

Correspondence Author:llb