GS0227-112 水素環境下における形状記憶合金細線の疲労寿命

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  • GS0227-112 Fatigue Life of Shape Memory Alloy Thin Wires in Hydrogen Environments

抄録

In this study, the fatigue behavior of TiNi alloy under various hydrogen environments was investigated by using thin wires with the diameter of 0.7 mm. In particular, the effect of frequency in hydrogen environments was investigated. Fatigue tests with stress ratio of R=0.1 were conducted in four kinds of environments: NaOH solution with hydrogen charging (current density J=127 mA/mm^2 and 0.0254 mA/mm^2), NaOH solution without charging, and pure water. Fatigue life decreased in these all hydrogen environments than in air. The effect of hydrogen charging current density on fatigue life was very small. The effect of frequency in current density J=127 mA/mm^2 was similar to that in ordinary metal corrosion fatigue, while in current density J=0.0254 mA/mm^2, the frequency effect was very small in the range of stress amplitude above fatigue limit in air, and the fatigue life depended on number of cycles. Therefore, life prediction by net stress model was conducted for current density J=127 mA/mm^2. As a result, the predictions agreed with the test results.

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