形状记忆合金热力学经验本构模型的数值分析及修正

doi:10.11896/cldb.20070071

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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.

Key words： shape memory alloy modification of constitutive model numerical analysis testing method of properties

Published: 30 September 2021

CLC number:

TB381

Fund:This work was financially supported by the Fundamental Research Funds for the Central Universities (NP2020415).

About author:: Jiefeng Li received his Ph.D. degree in engineering mechanics from the Nanjing University of Aeronautics and Astronautics in April 2019. He is currently associa-te research fellow and master's supervisor in Research Institute of Unmanned of Aerial Vehicle, Nanjing University of Aeronautics and Astronautics. He has published more than 10 journal papers as the first author, applied 9 national invention patents and 8 of them were authorized. His research interests are smart materials/structure and their mechanical properties.

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Cite this article:

LI Jiefeng,YANG Zhongqing. Numerical Analysis and Modification of Thermomechanical Empirical Constitutive Model of Shape Memory Alloy[J]. Materials Reports, 2021, 35(18): 18116-18123.

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http://www.mater-rep.com/EN/10.11896/cldb.20070071 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18116

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