サブレーヤモデルによるTiNi系形状記憶合金フィルムの熱・力学的挙動の解析(<小特集>:非弾性挙動の力学)

概要

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The advantage of TiNi shape memory alloy (SMA) film as an actuator material compared with SMA wire is that the heat transfer is carried out faster because the rate of the surface area to the volume is larger. For example, when the SMA film is used with electrical heating, its response speed is better due to the fast heat transfer. On the other hand, SMA film suffers inhomogeneous phase transformation, which influences the behavior of the actuator. In this paper, experiments are carried out to investigate the effect of inhomogeneous phase transformation to the function of SMA film actuator. A simple model for SMA film actuator (Sublayer Model) is proposed, taking into account the heat conduction to the transverse direction of each layer. The theoretical stress-strain curve is found to exhibit a similar tendency to the experimental result. On the basis of the theoretical model, it can be concluded that the stress and the temperature are distributed to the transverse direction of the SMA film, and that the proposed sublayer model can describe the behavior of the SMA film actuator in electrical heating.
一般社団法人日本機械学会の論文
2000-03-25