Characteristics Analysis of Shape Memory Alloy Elastic Coupling System Based on Improved Phase Transformation Equation

doi:10.3901/JME.2024.14.194

Abstract

Abstract: An improved phase transformation model based on the Brinson constitutive equation and the phase transformation principle of shape memory alloy(SMA) is proposed in order to accurately describe the actuating characteristics of SMA elastic coupling system, considering the complexity of the model and actual engineering requirements. A discontinuous problem of martensite fraction during the martensitic transformation in the positive phase transformation process of the Brinson phase transformation model is addressed. The twin martensite phase is transformed into a mixture of twin martensite phase and non-twin martensite phase at the end point of the phase transformation, and the volume fractions of each crystal at this point are considered as the crystal volume fractions at the end point of the positive phase transformation of martensite. The positive phase transformation of martensite is treated as a continuous process, and the equation for the positive phase transformation of martensite in the original Brinson phase transformation model is modified. A SMA elastic coupling system model is established based on a biased SMA wire actuator, and the improved Brinson phase transformation model is used to simulate and analyze system with different biased springs. The simulation results are compared with the corresponding experimental results. The results show that the computation results of the improved phase transformation model are in good agreement with the experimental results, and the volume fractions of martensite and austenite sum up to 1 during the phase transformation process, which is consistent with the actual situation. The analysis reveals that for SMA elastic coupling system, a larger stiffness of the bias spring leads to a slower response speed of the actuator, a wider temperature range for the phase transformation, and a higher heating current required for the complete martensite reverse phase transformation. The actuating strain initially increases and then decreases. The research results can more accurately describe the actuation process of SMA actuators and provide references for the design of biased SMA wire actuators.

Key words: shape memory alloy, actuation characteristics, phase transformation equation, bias spring

CLC Number:

TB381

ZHU Sunke, MIN Xu, DONG Shaojiang. Characteristics Analysis of Shape Memory Alloy Elastic Coupling System Based on Improved Phase Transformation Equation[J]. Journal of Mechanical Engineering, 2024, 60(14): 194-205.

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