Modeling Multiple-Step Loading Damage Evolution in Continuous Fiber-Reinforced Ceramic-Matrix Composites at Room and Elevated Temperatures
Publication: Journal of Aerospace Engineering
Volume 32, Issue 1
Abstract
In this paper, the multiple-step loading damage evolution in two-dimensional (2D) SiC/SiC ceramic-matrix composites (CMCs) at room and elevated temperatures and subjected to different applied cycle numbers was investigated. The unloading/reloading fiber axial stress distributions were analyzed, considering different fiber–matrix interface damage regions. The interface debonding and slip lengths upon unloading/reloading were obtained, considering the coupling effects of multiple loading stress levels and interface damage. The relationships between the hysteresis loops, interface debonding and sliding, and different loading sequences were established. Comparisons of damage evolution between constant and variable fiber–matrix interface shear stress, constant peak stress with cycle loading and multiple loading, and low-high multiple loading and high-low multiple loading sequences were conducted. The experimental cyclic multiple loading/unloading stress–strain hysteresis loops and fiber–matrix interface slip lengths of 2D SiC/SiC composites were predicted for different testing temperatures and applied cycles. The effects of temperature on the fiber–matrix interactions and the evolution of interfacial shear stress and the effect of cyclic loading number on the multiple-step loading damage evolution of two different SiC/SiC composites are discussed. With increasing temperature and applied cycle number, the area of the hysteresis loops and the interface debonding/sliding lengths subjected to multiple loading stress levels increase.
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Acknowledgments
The work reported here was supported by the Fundamental Research Funds for the Central Universities (Grant No. NS2016070). The author 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 32 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 26, 2018
Accepted: Jun 20, 2018
Published online: Oct 5, 2018
Published in print: Jan 1, 2019
Discussion open until: Mar 5, 2019
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