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이동엽(DongYeop Lee),오주연(JooYeon Oh),조인식(InSik Cho),김태형(TaeHyoung Kim),안종기(JongGi Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Owing to the increasing requirements in the market, mechanical components must have also an increasing life, which involves an improvement over high cycles in the fatigue strength. In the field of power systems, an ultrasonic fatigue test system is essential to analyze the crystal structure and heat transfer coefficient of metallic materials. The fatigue fracture and temperature distribution of Al6061-T6 alloy and SAE52100 bearing steel was analyzed by measuring the elastic modulus of specimen. Temperature distribution as a function of time of the two specimens starting from 25℃ to 260℃ was confirmed at the final break. Rapidly increase in temperature to 260℃ where cause the cracks, Effective Volume and elastic resonance is expected due to the stress concentration. Period of load functions to prevent ultrasonic fatigue testing and optimization of the thermal effect was described. Brazing process is being applied for the evaluation of the fatigue strength of joints ultrasonic fatigue test method is proposed. This study is concerned with the development of a new mechanical device for ultrasonic fatigue testing (UFT) and its characterization. The newly developed UFT device was developed by Mbrosia Co., Ltd.