Time-Dependent Deformation and Fracture Behavior of Fiber-Reinforced Ceramic-Matrix Composites under Stress-Rupture Loading at Intermediate Temperature
Publication: Journal of Aerospace Engineering
Volume 34, Issue 2
Abstract
The present study investigated the time-dependent deformation, damage, and fracture tendencies of fiber-reinforced ceramic-matrix composites (CMCs) that were exposed to stress-rupture loading at average environmental temperatures. The composite micro stress field and tensile constitutive relationship of the damaged CMCs were examined to characterize their time-dependent damage mechanisms. The relationships between stress-rupture lifetime, constant peak stress level, time-dependent composite deformation, and evolution of internal damages are established. The effects of composite material properties, composite damage state, and environmental temperature on stress-rupture lifetime, time-dependent composite deformation, and evolution of the internal damages of are analyzed. was monitored at various constant peak stress levels to predict their experimental stress-rupture lifetime, time-dependent composite deformation, and internal damage evolution. When the fiber volume increases, the stress-rupture lifetime increases, the time-dependent composite strain and the debonding fraction at the interface decrease, and the oxidation fraction at the interface increases. When the saturation space between the matrix cracking increases, the time-dependent composite deformation and the debonding fraction at the interface decrease, and the time for complete debonding and oxidation at the interface increases. When the constant peak stress level and environmental temperature increase, the stress-rupture lifetime decreases, the time-dependent composite deformation and the debonding fraction at the interface increase, and the oxidation fraction at the interface decreases.
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Data Availability Statement
The data used to support the findings of this study are available from the paper.
Acknowledgments
The work reported here is supported by the Fundamental Research Funds for the Central Universities (Grant No. NS2019038). The author also wishes to thank five 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 34 • Issue 2 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jun 25, 2020
Accepted: Sep 2, 2020
Published online: Nov 19, 2020
Published in print: Mar 1, 2021
Discussion open until: Apr 19, 2021
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