Abstract
Reversed plane bending fatigue tests were conducted on SiC particle-reinforced aluminum composites. The initiation and growth behaviors of small surface fatigue cracks were continuously monitored by the replica technique and investigated in detail. The fatigue life of MMC is shorter than that of matrix because there exists interface debonding of SiC particles and matrix on the whole face of the notch part in the casting metal matrix composite (MMC). The coalescence of small cracks was observed in the surface after conducting fatigue tests at high stress levels. Due to the coalescence, a higher crack growth rate of small cracks rather than that of long cracks was recognized in da/dn – K max relationship.
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