Abstract
In this chapter, the fatigue damage and lifetime prediction of fiber-reinforced ceramic-matrix composites (CMCs) are investigated. The fatigue damage mechanisms of matrix multi-cracking, fiber/matrix interface debonding, and fibers failure are considered. Upon unloading and reloading, the fiber sliding relative to the matrix in the interface debonded region, which is the main reason for the occurrence of the fatigue hysteresis loops. The fatigue hysteresis loops for the condition of interface partially and completely debonding are analyzed considering the fiber sliding damage mechanisms. Based on the damage mechanisms of fiber sliding relative to the matrix upon unloading/reloading, the fatigue hysteresis loops for the fiber/matrix interface partially and completely debonding are analyzed. The effects of fatigue peak stress, fatigue stress ratio, matrix crack spacing, and fibers volume fraction on the fiber/matrix interface debonding and sliding, the fatigue hysteresis dissipated energy and hysteresis dissipated energy-based damage parameters are discussed. The fatigue damage evolution and fatigue lifetime of unidirectional, cross-ply, 2D, 2.5D, and 3D CMCs are predicted.
Published Version
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