Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
The fatigue properties of thin wires, which are micro materials, are different from those of bulk materials, and the fatigue properties vary widely. In this study, the fatigue test and the coaxing effect test were conducted for the purpose of investigating the fatigue properties such as the existence of the fatigue limit and the existence condition of the fatigue limit in the Ti-6Al-4V alloy thin wire in which the fatigue limit exists in the bulk material. In addition, the tensile and hardness tests were conducted to examine the variation in the properties of thin wires. As the result of the fatigue test, two types of fracture behaviors were observed: crack-propagation-dominant fracture and necking-dominant fracture. Since the necking–fractured specimens tended to have a relatively short fatigue life, it is considered that one of the factors in the variation of fatigue life is the difference in fracture mode. As a result of the coaxing effect test, the coaxing effect could exist in the Ti-6Al-4V alloy thin wire, and the possibility of existing of the fatigue limit was shown.
