Fracture Resistance Characteristics of a Metal‐Toughened Ceramic

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Abstract
The fracture characteristics of an Al2O3/Al composite are examined. Measurements of resistance curves and work of rupture are compared with predictions of a micromechanical model, incorporating the effects of crack bridging by the Al reinforcements. The bridging traction law is assumed to follow linear softening behavior, characterized by a peak stress, σc, and a critical stretch‐to‐failure, uc. The values of σc and uc inferred from such comparisons are found to be broadly consistent with independent measurements of stretch‐to‐failure, along with the measured flow characteristics of the Al reinforcement. The importance of large‐scale bridging on the fracture resistance behavior of this class of composite is also demonstrated through both the experiments and the simulations.

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