907 高ひずみ速度応答を考慮した超弾性形状記憶合金のモデル化(OS9-2 形状記憶材料の特性と応用)

概要

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Super-elastic shape memory alloy (SE-SMA) has unique properties such as the stress saturation by stress-induced martensitic transformation, the recoverable strain over 6% and the huge hysteretic damping. By using those properties, its application to shock absorbing device is expected. In order to put it in a practical use, modeling of the SE-SMA under high strain rate deformation is required. In this paper, a constitutive model of the SE-SMA that takes account of the strain rate dependence of the transformation stress is proposed. The strain rate dependence of the transformation stress is formulated by applying the model of the thermally activated motion of dislocations incorporated with a thermomechanical model of polyciystalline SE-SMA proposed by Ikeda et al. The simulated results are compared with the experimental results to verify the validity of the proposed model.
2010-10-09