Abstract
In this study, the fatigue properties of aluminum die-casting alloy (JIS ADC10-T6) were evaluated quantitatively by means of √<area> method. Fatigue tests were performed in ambient air by means of a dual spindle type rotating bending fatigue testing machine for two types of the specimen; one is an hourglass type specimen and the other is a smooth specimen having four artificial drilled holes of which √<area> were ranged from 200 to 500 μm. After fatigue tests, fracture surfaces and artificial defects were observed using an optical microscope and a scanning electron microscope (SEM). As results, all hourglass type specimens failed from casting defects. In the case of the smooth specimen having four artificial drilled holes, fatigue limit decreased as artificial defects became large. According to the results of fatigue tests, it was clarified that the fatigue limit estimation proposed on the basis of results for JIS ADC12 could estimate the fatigue limit of JIS ADC10-T6.
