Abstract
Particle impact wad repeated on SiC ceramics and the results were compared with the case of single particle impact. A SiC or steel particle was accelerated to impact a SiC specimen repeatedly by an air gun with a time interval of 2 seconds. Ring cracks were overlapped with each other on the surface of the specimen by the repetition of particle impact. Chippings were initiated at the over-lapped points of ring cracks after the accumulated damage reached a critical value. The relation between chipping initiation life and impact velocity expressed by an inverse power law. The residual strength of the specimen was evaluated by a four-point bending test after the particle impact experiment, and it was degraded with the increase of impact velocity and of repeated numbers. However, the degradation was saturated in a comparatively small repetition. No more degradation in residual strength could be seen, even though the small parts were broken off due to chipping. The erosion rate under repetition of particle impact was expressed by a power function of impact velocity with the exponent of 3.2.
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