발간논문

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Vol.36, No.8, 1285 ~ 1290, 1998
Title
The Fatigue Crack Growth Behavior of Die - Cast Aluminum Alloy Matrix Composite Reinforced With SiC Particles
김송희 , 윤여범 , 이기호 , 오준도 , 주희위 , 이지환 S . H . Kim , Y . B . Yun , K . H . Rhee , J . T . Wu , X . W . Zhu , C . H . Lee
Abstract
This study is to investigate the effect of load ratio on fatigue crack of die-cast SiC particulate aluminum composites. Fundamental fatigue crack propagation tests were performed with sub-sized C-T specimens at a load ratio of 0.1, 0.3 and 0.5 respectively. Crack closure measurements were conducted for explaning the effect of load ratio on fatigue crack growth. The experimental results showed that the fatigue crack growth rate increases with the load ratio, especially at near threshold. The composite reinforced with 20 vol.% SiC particles was better in fatigue crack growth resistance than that with 10 vol.% SiC particles. Through the measurement of Kop and ΔK at various R ratios the concept of effective stress intensity factor range ratio. U was reviewed to evaluate the stress ratio effect on fatigue crack growth. Relationships between U and variables such as ΔK and R were obtained empirically so that we could predict ΔK_(eff) that is of critical importance for the prediction of fatigue crack propagation rate.
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