The results of a recent study of the crack/microstructure interactions in layered MoSi2/Nb composites are presented. Toughening by crack bridging and blunting mechanisms will be modeled in using micromechanics concepts. Finite element models for the prediction of interfacial debonding and mixed mode crack growth are also presented. The paper will highlight use of combined mechanics and materials approaches in the engineering of damage tolerant intermetallic matrix composites.

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