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Pseudoelasticity: experimental observations, thermomechanical modeling, and identification of the material parameters

机译:拟弹性:实验观察,热力学建模和材料参数识别

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In a certain temperature range, NiTi and other shape memory alloys show the so-called pseudoelastic effect. In the present study, the pseudoelasticity of NiTi is experimentally investigated in tension tests on thin-walled tubes. The observed phenomena are modeled within the framework of continuum thermomechanics regarding a geometric linear theory. The model is based on a free energy function in order to represent the occurring energy storage and release effects. Additionally, evolution equations for internal variables, like the inelastic strain tensor and the fraction of martensite, are introduced. The proposed system of constitutive equations represents the observed history-dependent material behavior. To identify the material parameters, the theory of neural networks is applied.
机译:在一定温度范围内,NiTi和其他形状记忆合金表现出所谓的拟弹性效应。在本研究中,在薄壁管的拉伸试验中对NiTi的拟弹性进行了实验研究。观察到的现象是在关于几何线性理论的连续热力学框架内建模的。该模型基于自由能量函数,以表示发生的能量存储和释放效果。此外,还介绍了内部变量的演化方程,例如非弹性应变张量和马氏体分数。所提出的本构方程系统代表了观察到的与历史有关的材料行为。为了识别材料参数,应用了神经网络理论。

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