DATA ACQUISITION FOR VERY HIGH CYCLE FATIGUE OF NON-FERROUS METALLIC MATERIALS BASED ON THE COLLABORATIVE RESEARCH IN JSMS - 2nd report: Effects of loading type, test environment, surface treatment and casting defects on VHCF properties of ADC12 aluminum die-casting alloy -

摘要

The very high cycle fatigue (VHCF) fracture has been important problem in the field of mechanical engineering. From this situation, a research sub-committee on VHCF has been established in the Society of Materials Science, Japan (JSMS) and VHCF data of three types of non-ferrous metals, such as die-cast aluminum, magnesium and β-titanium alloys, have been collected by many research organizations in the sub-committee. Our group deal with aluminum die-casting alloy ADC12. An ADC12 alloy is a useful material to reduce a weight of engineering products, but the VHCF data of this material are not many. Therefore, our group member have been carried out experimental works for studying some effects, effects of loading type, test environment, surface treatment and casting defects, on the VHCF properties of ADC12. As a result, it was found that there are some difference of VHCF properties between ADC12 and high-strength steel.