Microstructure Image-Based Modeling of Fracture in Continuous Fiber-Reinforced Ceramic Matrix Composites

V. BHEEMREDDY, K. CHANDRASHEKHARA, L. R. DHARANI, G. E. HILMAS

Abstract


The failure behavior of a continuous fiber-reinforced ceramic matrix composite (CFCC) is studied by the example of a unidirectionally reinforced SiC/SiCf composite. A multi-scale modeling framework is developed for evaluating damage at the micro-level. An actual fiber/matrix topology, based on a microstructure image, is used at the micro-level. A finite element mesh of the microstructure is generated using an object oriented finite element analysis tool. An extended finite element method, integrated with cohesive damage modeling, is used to study crack propagation in the microstructure. Finite element model validation using a benchmark study is discussed. The effect of matrix strength and matrix toughness on the stress-displacement behavior in the micromechanical model is studied. Cohesive parameters, cohesive strength, and fracture energy, of the micromechanical model are estimated from the constituent properties.

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ISSN 2168-4278 (Print)

ISSN 2168-4286 (Online)