| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 96 === Using miniature specimens could save material and cost during fatigue testing. Conventional fatigue test was conducted by MTS (material test system) which would be time and cost consuming. The purpose of this study was to propose a miniature fatigue test system for evaluating the fatigue properties using miniature specimens. The advantages of miniature fatigue test system included high working frequency, small volume, simple structure, and easy to repair. Materials of the miniature specimens used in this study were 2014-T651 aluminum alloy, 7075-T651 aluminum alloy, 304 stainless steel, and 4340 steel alloy. Constant amplitude loading with or without overload fatigue testing have been carried out. The fatigue crack growth properties results of the miniature specimens were compared with that of the standard specimens. The experimental results show that miniature fatigue test system was practicable.
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