Ti-Ni形状記憶合金の力学的性質の研究 : 形状記憶効果の繰返し特性試験

概要

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Experiments on Ti-Ni shape memory alloy wire under uniaxial tension with thermomechanical cycles were carried out. The influence of shape memory processing temperature and maximum strain upon cyclic characteristics of the shape memory effect were examined. The results obtained are summarized as follows. (1) Both recoverable strain with shape memory effect and strain range with stress-induced martensitic transformation show almost the constant values for thermomechanical cycles. (2) Residual strain increases in the early cycles, but shows a constant value after these cycles. (3) Two-way strain with reversible shape memory effect increases with the number of cycles. (4) Residual strain is proportional to two-way strain ; both strains are proportional to maximum strain. (5) Yield stress of stress-induced martensitic transformation decreases significantly in the early cycles, but decreases gradually after these cycles. The yield stress decreases for high shape memory processing temperature. (6) Stress corresponding to maximum strain decreases with the number of cycles, but the amount of the variation is small.
一般社団法人日本機械学会の論文
1989-07-25