Damage Monitoring and Life Prediction of Cross-Ply SiC/CAS Ceramic-Matrix Composites at Room and Elevated Temperatures under Cyclic Loading
Publication: Journal of Aerospace Engineering
Volume 31, Issue 1
Abstract
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°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°C, respectively.
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Acknowledgments
The work reported here is supported by the Natural Science Fund of Jiangsu Province (Grant No. BK20140813), and the Fundamental Research Funds for the Central Universities (Grant No. NS2016070). The author also wishes to thank three anonymous reviewers and editors for their helpful comments on an earlier version of the paper.
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Published In
Journal of Aerospace Engineering
Volume 31 • Issue 1 • January 2018
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©2017 American Society of Civil Engineers.
History
Received: Feb 28, 2017
Accepted: Jun 29, 2017
Published online: Oct 27, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 27, 2018
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