Abstract
The Al2O3/SiC composite has an improved mechanical property compared with alumina matrix, and it can be used in the lightweight armour system. In this study, the dynamic tensile and compressive strength, strain rate sensitivity, fracture mechanism and fragments scale of the composite were carried out by experimental and theoretical analysis. Results showed that the dynamic strength of the Al2O3/SiC composite was sensitive to the strain rate, and it was controlled by its microstructure. The microfracture mechanism of the composite varied with the locations and stress states of specimen, which consisted of second phase particles effects, the intergranular and transcrystalline fracture mode, fractured core area, grain-boundary crack, grain distortion and splitting, cleavage fracture zones, slip bands et al. In the dynamic compression experiments, the statistic analysis results of recycled fragments were more agreed with the prediction of the modified DID model.
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