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研究SMA动力学优化模型,针对形状记忆合金(SMA)驱动丝具有强非线性、迟滞效应等特性,为设计SMA驱动丝的自适应结构,提出建立SMA驱动丝模型并提供高效的仿真方法。采用有限元软件实现了受轴向载荷的SMA驱动丝的仿真建模。对本构模型是根据自由能的一维热-力学耦合模型,可以同时复现形状记忆效应和超弹性。数值仿真能够引起材料相变的非均匀温度和应变分布。仿真结果表明,建立热-力学耦合模型,可为设计SMA驱动丝的自适应结构计算提供可靠依据。
To study SMA dynamic optimization model, SMA wire has characteristics of strong nonlinearity and hysteresis. In order to design an adaptive structure of SMA driving wire, an SMA driven wire model is proposed and an efficient simulation method is provided. The finite element software is used to simulate the SMA driven wire under axial load. The constitutive model is a one-dimensional thermo-mechanical coupling model based on free energy, which can reproduce the shape memory effect and hyperelasticity simultaneously. Numerical simulations can lead to non-uniform temperature and strain distributions of phase transformations. The simulation results show that the establishment of thermo-mechanical coupling model can provide a reliable basis for the design of adaptive structure calculation of SMA drive wire.