TiNi形状記憶合金の繰返し変形特性 : バイアス式2方向性形状記憶素子の挙動

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In order to investigate the basic mechanical properties of a bias-type two-way shape memory component, the thermal cyclic experiments on a TiNi shape memory alloy wire under a constant spring constant of a bias spring were carried out. The cyclic characteristics of recovery stress and recovery strain and the conditions for application of cyclic recovery stress and recovery strain were discussed. The main results are summarized as follows. The recovery stress and the recovery strain induced in the two-way component take the maximum values at the initial strain near the completing point of the stress-induced martensitic transformation. The recovery stress and the recovery strain decrease significantly in the early cycles, but take almost constant values after these cycles. In order to obtain large recovery stress, it is necessary to make the spring constant of the bias spring high and to make the initial strain small. In order to get large recovery strain, it is necessary to make the spring constant low and the initial strain large. The transformation temperatures of the stress-induced martensitic transformation and the reverse transformation rise with the number of thermal cycles. In progress of thermal cycles, the stress-induced martensitic transformation and the reverse transformation occur gradually with variation in temperature, and the starting and completing temperatures of each transformation become unclear.
一般社団法人日本機械学会の論文
1991-05-25

TiNi形状記憶合金の繰返し変形特性 : バイアス式2方向性形状記憶素子の挙動

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