Abstract
In SiC particulate reinforced aluminum alloy matrix composites, the aim has been to combine the beneficial stiffness and strength of ceramics with the superior ductility and toughness of metals. Although the stiffness and strength of the composites have been usually improved, the combination, however, produces relatively lower ductility and toughness in composites as compared to the matrix alloy. The drop in toughness has been attributed to many factors, one of which, the fracture of SiC particulates, plays an essential role in the failure of the composite under monotonic or cyclic loading. The cleavage of SiC particulate results in microcracks in the composite, which will substantially affect the macromechanical properties of the material. In this paper, as a first effort, a very simple model is proposed to estimate the behaviors of the particulate fracture which is affected by the metal matrix.
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