Affiliation of Author(s):民航学院

Journal:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Key Words:airworthiness ceramic-matrix composites (CMCs) damage development fatigue lifetime

Abstract:The damage development and cyclic fatigue lifetime of cross-ply SiC/CAS ceramic-matrix composites have been investigated at different testing temperatures in air atmosphere. The relationships between the fatigue hysteresis-based damage parameters, i.e., fatigue hysteresis dissipated energy, fatigue hysteresis modulus and fatigue peak strain and the damage mechanisms of matrix multicracking, fiber/matrix interface debonding, interface sliding and fibers failure, have been established. With the increase in the cycle number, the evolution of the fatigue hysteresis modulus, fatigue peak strain and fatigue hysteresis dissipated energy depends upon the fatigue peak stress levels, interface and fibers oxidation and testing temperature. The fatigue life S-N curves of cross-ply SiC/CAS composite at room and elevated temperatures have been predicted, and the fatigue limit stresses at room temperature, 750 and 850 A degrees C, are 50, 36 and 30% of the tensile strength, respectively.

ISSN No.:1059-9495

Translation or Not:no

Date of Publication:2017-12-01

Correspondence Author:llb