Numerical Analysis and Modification of Thermomechanical Empirical Constitutive Model of Shape Memory Alloy
LI Jiefeng1,2, YANG Zhongqing1,2
1 Research Institute of Unmanned Aerial Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2 Key Laboratory of Advanced Technology for Small and Medium-Sized UAV, Ministry of Industry and Information Technology, Nanjing 210016, China
Abstract: The development of constitutive model of shape memory alloy (SMA) can be used to accurately describe the special thermomechanical properties of SMA, which is important in the construction of theory of constitutive model. Meanwhile, more material parameters and more complex equations in the developed constitutive models make them difficult to be applied in the engineering. Empirical constitutive model is constructed based on the elastic linear constitutive model of metal materials, which is concise in form and understandable for engineers. However, the implementation of the numerical analysis of thermomechanical properties based on the empirical constitutive model and the testing method of material parameters for SMA are still intriguing issues. Therefore, the testing method consistent with the application condition was presented, and the analysis technique for experimental data was proposed in this paper. Then, the material parameters were obtained to describe all the characterizations of SMA. Based on these parameters, the empirical constitutive model was used to predict the relation of strain-temperature under constant stress loading and the relation of stress-strain under constant temperature. The predicted results were compared with the experimental data, and the difference in the empirical constitutive model was modified. The research conclusions are useful in theoretical analysis and SMA properties testing for designing of a SMA driver.
李杰锋, 杨忠清. 形状记忆合金热力学经验本构模型的数值分析及修正[J]. 材料导报, 2021, 35(18): 18116-18123.
LI Jiefeng, YANG Zhongqing. Numerical Analysis and Modification of Thermomechanical Empirical Constitutive Model of Shape Memory Alloy. Materials Reports, 2021, 35(18): 18116-18123.
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2021, Vol. 35 
