Abstract

AbstractIn this chapter, the first matrix cracking behavior in fiber-reinforced ceramic-matrix composites (CMCs) is investigated using a micromechanical approach. Micro-stress field with interface debonding and fiber failure is established to analyze the energy balance relationship before and after matrix cracking. Numerical result of first matrix cracking stress (FMCS) is obtained. Relationships between the FMCS, interface debonding and slip, and fiber fracture are established. Effects of fiber volume fraction, interface shear stress, interface debonded energy, fiber Weibull modulus, and fiber strength on the FMCS, interface debonding length, and fiber broken fraction are analyzed. Experimental FMCS of three different CMCs with different fiber volume fractions is predicted.KeywordsCeramic-matrix composites (CMCs)First matrix cracking stress (FMCS)Interface debondingFiber failure

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