Abstract
In this chapter, a micromechanical approach is developed to predict fatigue life of fiber-reinforced ceramic-matrix composites (CMCs) subjected to stochastic overloading stress at elevated temperature. Multiple elevated temperature fatigue damage mechanisms of interface wear and interface and fiber oxidation are considered in the analysis of elevated temperature fatigue damage evolution and fracture under stochastic overloading. Relationships between stochastic overloading stress level and occurrence applied cycle number, broken fibers fraction, and fatigue life decreasing rate are established. Experimental fatigue life S–N curves of C/SiC composites with different fiber preforms (i.e., unidirectional, cross-ply, 2D woven, 2.5D woven, and 3D braided) are predicted for different stochastic overloading stress levels and occurrence applied cycle number.
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