On the Propagation Behavior of the Fatigue Crack along the Interface of Metal Composites

概要

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Push-pull fatigue tests were conducted on butt-bonded three layer composite plates composed of iron and copper to study the propagation behaviors of fatigue cracks along interfaces. Observations showed that the cracks along interfaces are classified into three patterns of "interface cracks" propagating precisely along the interface between iron and copper, "subinterface cracks" propagating in copper region at a distance of 20〜30μm from the interface and "copper cracks" propagating in copper region far away from the interface. The propagation of the subinterface crack among others was fastest due to weakening of the subinterface region caused by diffusion of impurities into this region. The growth rate of the interface crack is largely affected by the amount of copper deposited on the iron side of the fractured surface, and the larger is the amount of copper deposit, the larger is the growth rate. The growth rate of the subinterface crack can be evaluated at least qualitatively by the value of K_I estimated for cracks located at interfaces of three layer composite plates, but further study is necessary for the estimation of more reliable values of K_I for such cracks.
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