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Gil-do Jeong(정길도),Mynul(마이눌),Amkee Kim(김엄기) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The solid particle erosion behaviour of unidirectional carbon fiber reinforced plastic (CFRP) composites was investigated. The erosive wear of these composites was evaluated at different impact angles (30°,45°,60°,90°), different impact velocities (40, 55, 60,70㎧) and at three different fiber orientations (0°,45°,90°). The erodent used was silica sand with the size range 50-100㎛ of irregular shapes. The result showed ductile erosion behaviour with maximum erosion rate at 30° impingement angle. The Fiber orientations had a significant influence on erosion. The erosion rate displayed a strong dependence on impact velocity which followed the power law E∝V<SUP>n</SUP> for all materials. Based on three factors impact velocity(V), impact angle(α) and fiber orientation angle(β) a general method was proposed to predict the erosion rate of unidirectional fiber reinforced composites.
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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.
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