Affiliation of Author(s):民航学院

Journal:ENGINEERING FRACTURE MECHANICS

Key Words:Ceramic-matrix composites (CMCs) Fatigue Life prediction Damage evolution Hysteresis loops

Abstract:In this paper, the damage evolution and life prediction of different 2D woven fiber reinforced ceramic-matrix composites (CMCs), i.e., C/SiC, SiC/SiC, SiC/Si-N-C, Nextel 610(TM)/Aluminosilicate, and Nextel 720(TM)/Aluminosilicate, at room and elevated temperatures have been investigated. The evolution of fatigue hysteresis dissipated energy and interface shear stress versus cycle number curves have been analyzed. This fatigue life S-N curves and broken fibers fraction versus cycle number have been predicted. For non oxide CMCs, i.e., C/SiC, SiC/SiC or SiC/Si-N-C, the fatigue limit stress greatly reduces at elevated temperature in air, i.e., 21% tensile strength of C/SiC at 550 degrees C in air, 25% tensile strength of SiC/SiC at 800 degrees C in air, and 25% tensile strength of SiC/Si-N-C at 1000 degrees C in air; however, for oxide-oxide CMCs, the fatigue limit stress is much higher than that of non-oxide CMCs, i.e., 60% tensile strength of Nextel 610(TM)/Aluminosilicate and Nextel 720(TM)/Aluminosilicate at 1000 degrees C and 1200 degrees C in air. (C) 2017 Elsevier Ltd. All rights reserved.

ISSN No.:0013-7944

Translation or Not:no

Date of Publication:2017-03-15

Correspondence Author:llb