Damage Monitoring and Life Prediction of Cross-Ply SiC/CAS Ceramic-Matrix Composites at Room and Elevated Temperatures under Cyclic Loading
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所属单位：民航学院
发表刊物：JOURNAL OF AEROSPACE ENGINEERING
关键字：Ceramic-matrix composites (CMCs) Airworthiness Fatigue Damage evolution Life prediction Hysteresis loops Fiber fracture
摘要：In this paper, damage monitoring and fatigue-life prediction of cross-ply silicon carbide fiber-reinforced calcium aluminosilicate (SiC/CAS) ceramic-matrix composites (CMCs) at room temperature and elevated temperatures of 700 and 850 degrees C in an air atmosphere have been investigated. Considering the fatigue-damage mechanisms of interface wear, interface oxidation, and fiber oxidation, the relationships among fatigue hysteresis-loop evolution, interface shear-stress degradation, broken fibers, and fatigue lifetime have been established. The evolution of damage parameters, i.e., fatigue hysteresis dissipated-energy changing rate, interface shear-stress degradation rate, broken-fiber fraction, and fatigue-life stress-cycle (S-N) curves have been analyzed. The interface shear-stress degradation rate is affected by the maximum stress level and testing environment; the fatigue hysteresis dissipated energy decreases with the applied increment cycles and experimental temperatures. The fatigue limit stresses are 50, 36, and 30% of tensile strength at room temperature and 700 and 850 degrees C, respectively. (C) 2017 American Society of Civil Engineers.
ISSN号：0893-1321
是否译文：否
发表时间：2018-01-01
通讯作者：李龙彪
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