NiTi合金の高弾性細線および超弾性細管の変形および疲労特性

概要

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The tensile deformation and rotating-bending fatigue life of a highelastic thin wire and a superelastic thin tube of NiTi alloy were investigated experimentally. The results obtained are summarized as follows. (1) The stress-strain curve of the highelastic thin wire is approximately straight till strain of 4% with stress of 1400MPa and depends little on temperature and strain rate. (2) Modulus of elasticity of both the wire and tube is low, having superior performance of flexibility which is necessary for medical application. (3) The strain-based fatigue curve of the alloy consists of two straight lines. The strain amplitude of fatigue limit is in the region of 0.6〜0.8%. (4) In the tube, the fatigue crack initiates on the inner surface since the inner surface is rough, resulting in short fatigue life.
一般社団法人日本機械学会の論文
2004-01-25