TiNi合金の超弾性細管および高弾性細線の曲げ疲労特性

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Tensile deformation properties and pulsating-plane bending, alternating-plane bending and rotating-bending fatigue properties of a superelastic thin tube (SE-tube) and a highelastic thin wire (HE-wire) of TiNi alloy were investigated experimentally. The main results obtained are summarized as follows. (1) The stress-strain curve of the SE-tube in tension draws a superelastic hysteresis loop and elastic modulus is 35GPa. Therefore, the SE-tube is superior as a medical catheter tube with flexibility and shape recovery. The stress-strain curve of the HE-wire is close to a straight line up to strain of 4% and stress of 1500MPa and elastic modulus is 50GPa. Therefore, the HE-wire is superior as a medical guide wire with flexibility, high pushability and torque transmission performance. (2) With respect to fatigue properties of the SE-tube and the HE-wire in air, the fatigue life in pulsating-plane bending is longer than that in alternating-plane bending and rotating bending. The difference in the fatigue life between alternating-plane bending and rotating bending is small. The relationship between maximum bending strain and the number of cycles to failure in the region of low-cycle fatigue can be expressed by a power function in every bending fatigue. The fatigue life in the body is longer than that in air. (3) The maximum bending strain at the fatigue limit of the SE-tube is 0.8%-1.0% which is close to a starting strain of the stress-induced martensitic transformation. The maximum bending strain at the fatigue limit of the HE-wire is 0.7%-0.8%.
社団法人日本機械学会の論文
2009-01-25

TiNi合金の超弾性細管および高弾性細線の曲げ疲労特性

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