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Thickness Effect on Compressive Fatigue Behavior of Al-Si-Ca Alloy Foam
Ilhyun Kim(김일현),Mynul Hossain(마이눌),Amkee Kim(김엄기) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The compressive fatigue tests on the closed cell Al-Si-Ca alloy foams with two different thicknesses were performed using a load ratio of 0.1. The quasi-static and cyclic compressive behaviors were obtained respectively. The fatigue stress-life (S-N) curves were evaluated from the obtained cyclic compressive behaviors. S-N curves were presented for the onset of progressive shortening. It turned out that the fatigue strength showed higher value for the thicker foam and the onset of shortening of thinner foam took place earlier. The crushing was found to initiate in a single band which broadens gradually with additional fatigue cycles. Progressive shortening of the specimen took place due to a combination of low cycle fatigue failure and cyclic ratcheting.