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http://dx.doi.org/10.7234/kscm.2008.21.6.015

Initiation and Growth Behavior of Small Surface Fatigue Crack on SiC Particle Reinforced Aluminum Composite  

Lee, Sang-Hyoup (구미1대학 자동차산업계열)
Choi, Young-Geun (구미1대학 자동차산업계열)
Kim, Sang-Tae (영남대학교 기계공학부)
Lee, Moon-Hwan (구미1대학 자동차산업계열)
Publication Information
Composites Research / v.21, no.6, 2008 , pp. 15-22 More about this Journal
Abstract
Reversed plane bending fatigue tests were conducted on SiC particle aluminum composite. 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 micro-cracks was observed in the tests conducted at high stress levels. Due to the coalescence, a higher crack growth rate of small cracks rather than those of long cracks was recognized in da/dn-$K_{max}$ relationship.
Keywords
SiC Particle; Fatigue; Crack initiation; Crack growth; Small surface crack; Bending fatigue test; Metal matrix composite;
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