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Materials 2017, 10(4), 371; doi:10.3390/ma10040371

Fatigue Damage and Lifetime of SiC/SiC Ceramic-Matrix Composite under Cyclic Loading at Elevated Temperatures

College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No. 29 Yudao St., Nanjing 210016, China
Academic Editor: Javier Narciso
Received: 22 February 2017 / Revised: 23 March 2017 / Accepted: 30 March 2017 / Published: 31 March 2017
View Full-Text   |   Download PDF [9752 KB, uploaded 31 March 2017]   |  

Abstract

In this paper, the fatigue damage and lifetime of 2D SiC/SiC ceramic-matrix composites (CMCs) under cyclic fatigue loading at 750, 1000, 1100, 1200 and 1300 °C in air and in steam atmosphere have been investigated. The damage evolution versus applied cycles of 2D SiC/SiC composites were analyzed using fatigue hysteresis dissipated energy, fatigue hysteresis modulus, fatigue peak strain and interface shear stress. The presence of steam accelerated the damage development inside of SiC/SiC composites, which increased the increasing rate of the fatigue hysteresis dissipated energy and the fatigue peak strain, and the decreasing rate of the fatigue hysteresis modulus and the interface shear stress. The fatigue life stress-cycle (S-N) curves and fatigue limit stresses of 2D SiC/SiC composites at different temperatures in air and in steam condition have been predicted. The fatigue limit stresses approach 67%, 28%, 39% 17% and 28% tensile strength at 750, 1000, 1100, 1200 and 1300 °C in air, and 49%, 10%, 9% and 19% tensile strength at 750, 1000, 1200 and 1300 °C in steam conditions, respectively. View Full-Text
Keywords: ceramic-matrix composites (CMCs); fatigue; damage evolution; life prediction; matrix cracking; interface debonding ceramic-matrix composites (CMCs); fatigue; damage evolution; life prediction; matrix cracking; interface debonding
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Li, L. Fatigue Damage and Lifetime of SiC/SiC Ceramic-Matrix Composite under Cyclic Loading at Elevated Temperatures. Materials 2017, 10, 371.

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