Ti Ni形状記憶合金の力学的性質の研究 : 変態擬弾性の繰返し特性の実験

概要

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Experiments on TiNi shape memory alloy wire under uniaxial tension with cyclic loading and unloading were carried out. The influence of shape memory processing temperature, test temperature and maximum strain upon cyclic characteristics of pseudoelasticity was examined. The results obtained are summarized as follows. (1)Yield stresses of stress-induced martensitic transformation and of inverse transformation and stress corresponding to maximum strain decrease with number of cycle. (2)Strain ranges of martensitic transformation and of inverse transformation roughly coincide. The strain ranges decrease with number of cycle. The amount of decrease is small. (3)Residual strain in each cycle increases with number of cycle. Residual strain is proportional to maximum strain* shape memory processing temperature and test temperature. (4)Recoverable strain energy and dissipated strain energy per unit volume decrease with number of cycle. (5)Every characteristic value (1)-(4) varies significantly in early cycles, but becomes stable after a certain cycles.
社団法人日本機械学会の論文
1989-03-25