Abstract
In this paper, the fatigue hysteresis loops of fiber-reinforced ceramic-matrix composites (CMCs) under multiple loading stress levels considering interface wear has been investigated using micromechanical approach. Under fatigue loading, the fiber/matrix interface shear stress decreases with the increase of cycle number due to interface wear. Upon increasing of fatigue peak stress, the interface debonded length would propagate along the fiber/matrix interface. The difference of interface shear stress existed in the new and original debonded region would affect the interface debonding and interface frictional slipping between the fiber and the matrix. Based on the fatigue damage mechanism of fiber slipping relative to matrix in the interface debonded region upon unloading and subsequent reloading, the interface slip lengths, i.e., the interface debonded length, interface counter-slip length and interface new-slip length, are determined by fracture mechanics approach. The fatigue hysteresis loops models under multiple loading stress levels have been developed. The effects of single/multiple loading stress levels and different loading sequences on fatigue hysteresis loops have been investigated. The fatigue hysteresis loops of unidirectional C/SiC composite under multiple loading stress levels have been predicted.
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Acknowledgements
The author thanks the Science and Technology Department of Jiangsu Province for the funding that made this research study possible. The author would also thank Prof. Pwter W.R. Beaumont for his valuable comments on an earlier version of the paper.
Funding
This study has received the support from the Science and Technology Department of Jiangsu Province through the Natural Science Foundation of Jiangsu Province (Grant No. BK20140813).
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The author declares that he has no conflict of interest.
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Longbiao, L. Modeling for Fatigue Hysteresis Loops of Carbon Fiber-Reinforced Ceramic-Matrix Composites under Multiple Loading Stress Levels. Appl Compos Mater 22, 945–959 (2015). https://doi.org/10.1007/s10443-015-9444-5
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DOI: https://doi.org/10.1007/s10443-015-9444-5