Method for Designing Springs Using Materials with Shape Memory as the Actuators of Power Units

Andronov, I. N.; Demina, M. Yu.; Polugrudova, L. S.

doi:10.3103/s1052618818020024

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Although the structure of the SMA spring is simple, the performance of the SMA spring is complex due to its strong non-linear thermomechanical properties. 15–18 Ma et al 19 analyzed a biased bidirectional SMA actuator composed of SMA spring and steel spring, and established the relationship of output displacement and force of SMA spring actuator with temperature, stress-strain, material parameters as well as dimensional parameters. Gédouin et al 20 present a theoretical method for the analytical study of SMA helical spring actuators, which can effectively predict the thermomechanical behavior of linear biased spring actuators.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical performance analysis and experiment of electrothermal shape memory alloy helical spring actuator

Xiong

Huang

Shu

2021

Advances in Mechanical Engineering

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In this paper, an electrothermal shape memory alloy helical spring actuator constructed from shape memory alloy with copper-cored enameled wire is presented and fabricated. Based on the shear constitutive model of a shape memory alloy, the Thermo equilibrium equation and the geometrical equation of helical spring establish the thermomechanical theoretical model of helical spring actuator with electrothermal shape memory alloys under different scenarios. The thermomechanical behaviors of the actuator were verified by numerical simulation with experimental tests, and the actuator thermomechanical properties were derived from the analysis with current, temperature, response time, restoring force, and axial displacement as parameters. The experimental results show that the actuator produces a maximum recovery force of 70.2 N and a maximum output displacement of 7.7 mm at 100°C. The actuator response time is 26 s at a current of 3A. It is also demonstrated that the theoretical model can effectively characterize the complex thermo-mechanical properties of the actuator due to the strong nonlinearity of the shape memory alloy. The experimental temperature-force response and temperature-displacement response, as well as the force-displacement response at different temperatures, provide references for the design and fabrication of electrothermal shape-memory alloy coil spring actuators.

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Section: Introductionmentioning

confidence: 99%

Thermomechanical performance analysis and experiment of electrothermal shape memory alloy helical spring actuator

Xiong

Huang

Shu

2021

Advances in Mechanical Engineering

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Study of Variable Thickness Magnetorheological Transmission Performance of Electrothermal Shape Memory Alloy Squeeze

Chen

Huang

2022

Applied Sciences

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This paper designs a new composite transmission device for improving the transmission torque by squeezing magnetorheological fluid (MRF) with an electrothermal shape memory alloy (SMA) spring. Based on the finite element method, a numerical analysis of the magnetic circuit and magnetic field distribution of the magnetorheological (MR) transmission is presented, as well as a theoretical derivation and calculation of the squeezing force output by the electrothermal SMA spring and the transfer torque of the variable thickness MR transmission. In addition, the output characteristics of the electrothermal SMA spring at different temperatures are analyzed, as are the torque characteristics of the variable thickness MR transmission. The research shows that the electrothermal SMA springs exhibit a highly non-linear squeezing force output during the temperature rise, and the increase in current affects the martensite phase transition quality, and thus the phase transition temperature. The squeezing force generated by the springs increases significantly when the temperature is within the martensitic phase transformation interval, with a maximum squeezing force of 318.43 N when the SMA temperature reaches 100 °C. The proposed variable thickness MR transmission can increase the maximum torque by 4.88 times under SMA spring squeezing force, and its maximum transmitted torque is increased from 15.08 to 73.56 N·m. By squeezing the MRF with an electrothermal SMA spring, the torque of the variable thickness MR transmission can be increased quickly and effectively.

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Method for Designing Springs Using Materials with Shape Memory as the Actuators of Power Units

Cited by 2 publications

References 4 publications

Thermomechanical performance analysis and experiment of electrothermal shape memory alloy helical spring actuator

Thermomechanical performance analysis and experiment of electrothermal shape memory alloy helical spring actuator

Study of Variable Thickness Magnetorheological Transmission Performance of Electrothermal Shape Memory Alloy Squeeze

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