Affiliation of Author(s):民航学院

Journal:INTERNATIONAL JOURNAL OF FATIGUE

Key Words:Ceramic-matrix composites (CMCs) Airworthiness Thermomechanical fatigue Hysteresis loops Interface shear stress

Abstract:In this paper, the thermomechanical fatigue hysteresis loops of long-fiber-reinforced ceramic -matrix composites(CMCs) subjected to out-of-phase (OP) cyclic loading have been investigated using the micromechanical approach. The fiber/matrix interface shear stress is determined as a function of the testing temperature and material properties, which affects the matrix multicracIdng and fiber/matrix interface debonding and sliding upon unloading and reloading. The relationships between the cyclic temperature and stress level, matrix multicracking, interface debonding and sliding, and the shape, location and the area of the thermomechanical fatigue hysteresis loops have been established. The effects of the fiber volume fraction, fatigue peak stress, matrix cracking space, fiber/matrix interface debonded energy and cyclic temperature range on the thermomechanical fatigue hysteresis loops subjected to out-of-phase cyclic loading have been analyzed. The differences of the thermomechanical fatigue hysteresis loops, interface debonding and sliding between the out-of-phase (OP) and in-phase (IF) thermomechanical cyclic loading have been analyzed. The thermomechanical fatigue hysteresis loops of cross ply SiC/MAS composite under out-of-phase tension-tension cyclic loading have been predicted. (C) 2017 Elsevier Ltd. All rights reserved.

ISSN No.:0142-1123

Translation or Not:no

Date of Publication:2017-12-01

Correspondence Author:llb