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The fracture strain of discontinuously reinforced metal matrix composites (DRMMCs) is studied according to a damage mechanics model proposed by McClintock, with a localized crack propagation hypothesis and particle-related crack initiation mechanism. An estimation equation is proposed. The estimated results are verified with the data available in the literature and those measured on some types of DRMMCs obtained by powder metallurgical techniques. The experimental results show good agreement with the estimation model.