Abstract
In this paper, the synergistic effects of stress rupture and cyclic loading on the strain response of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperature in air have been investigated. The stress-strain relationships considering interface wear and interface oxidation in the interface debonded region under stress rupture and cyclic loading have been developed to establish the relationship between the peak strain, the interface debonded length, the interface oxidation length and the interface slip lengths. The effects of the stress rupture time, stress levels, matrix crack spacing, fiber volume fraction and oxidation temperature on the peak strain and the interface slip lengths have been investigated. The experimental fatigue hysteresis loops, interface slip lengths, peak strain and interface oxidation length of cross-ply SiC/MAS (magnesium alumino-silicate, MAS) composite under cyclic fatigue and stress rupture at 566 and 1093 °C in air have been predicted.
Highlights
Ceramic materials possess high strength and modulus at elevated temperature
The objective of this paper is to investigate the synergistic effects of stress rupture and cyclic loading on the strain response of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperatures in air
Under cyclic fatigue loading at elevated temperatures, the interface wear and interface oxidation will affect the degradation of the interface shear stress, the interface debonding and slipping length, and the strain response of fiber-reinforced CMCs
Summary
Ceramic materials possess high strength and modulus at elevated temperature. their use as structural components is severely limited because of their brittleness. Many researchers have performed experimental and theoretical investigations on the stress rupture and cyclic fatigue behavior of fiber-reinforced CMCs. Lara-Curzio [2] developed a micromechanical model to predict the reliability and lifetime of unidirectional CMCs subjected to stresses beyond the first matrix cracking stress at elevated temperatures. Ruggles-Wrenn and Lee [7] investigated the tension-tension fatigue behavior of a 2D woven SiC/SiC composite with an inhibited matrix at 1300 ◦ C in air and in steam conditions. The objective of this paper is to investigate the synergistic effects of stress rupture and cyclic loading on the strain response of fiber-reinforced CMCs at elevated temperatures in air. The effects of the stress rupture time, stress level, matrix crack spacing, fiber volume content and oxidation temperature on the peak strain and the interface slip lengths were investigated. The experimental fatigue hysteresis loops, interface slip lengths, peak strain and interface oxidation length of cross-ply SiC/MAS (magnesium alumino-silicate, MAS) composite under cyclic fatigue and stress rupture at 566 and 1093 ◦ C in air were predicted
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