S. Subramanian

ABSTRACT

In this paper, a cumulative damage model is described to predict the fatigue life of unidirectional metal matrix composites under combined thermomechanical fatigue loading. The fatigue life prediction is based on the critical element model. A micromechanics model is used to predict the accumulation of damage in the form of fiber fractures, matrix plasticity and interfacial debonding. The fatigue life is estimated using a linear summation life fraction rule. In the present model, both the local stresses and strength of the constituents of the composite namely fiber, matrix and interface are considered. Results indicate that the predicted fatigue life of unidirectional MMCs agree well with the experimental data for a variety of composites. The model can predict the effects of test temperature, fiber volume fraction, loading frequency and thermomechanical fatigue (TMF) loading well.

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