AZ31Mg合金圧延材の疲労特性に及ぼす負荷開始方向の影響

抄録

The effect of initial loading direction on fatigue life of AZ 31 magnesium alloy plate was investigated. Axial fatigue test at high stress amplitude were performed at room temperature. We recorded stress-strain hysteresis loops to investigate the cyclic deformation behavior. There were noticeable changes in N-S curves at stress amplitude of 90 MPa and 100 MPa, fatigue lives of initial loading from tension were longer than that of initial loading from compression. On the other hand, at stress amplitude of 110 MPa fatigue life of initial loading from compression was shorter than the initial loading form tension. As the maximum tensile strain at the first cycle became larger, the fatigue life became longer at the same stress amplitude.