Journal of Engineering Research
DOI
10.70259/engJER.2024.851816
Abstract
Shape memory alloys (SMAs) are well-known for their remarkable mechanical properties, particularly their shape memory and super-elasticity abilities. These Properties make them ideal for a variety of adaptive mechanical applications. The most common application is the implementation of SMA wires as mechanical actuators. However, the nonlinear characteristics and the hysteresis nature of SMAs limit their utility in engineering applications. This makes SMAs desirable, but it is considered a complicated material for developing advanced rehabilitation devices that can significantly enhance patient treatment. In this paper, a finite element analysis, (FEA) study investigated the behaviour of SMA wires under mechanical loads. COMSOL Multiphysics was employed to conduct our analysis. The work focuses on phase transformation kinetics, stress-strain response, and tracking martensite fraction evolution through the loading cycles. A uniaxial load of 850 MPa was applied to a 500 mm long wire at a constant ambient temperature of 328 K. The SMA wire experienced a phase change from austenite to martensite and reversed back upon unloading. The martensite started and finished at 204 MPa, and 243.66 MPa, respectively. While the austenite started and finished at 144.5 MPa, and 116.14 MPa, respectively. The simulation validates the capability of the SMA wire to be implemented in rehabilitation devices such as exoskeletons and knee braces.
Recommended Citation
Mamdouh, Ali M.; Helal, Ali S.; and El - Samadony, Yasser A F
(2024)
"Finite Element Analysis of stress-induced Phase Transformation in SMA Wire,"
Journal of Engineering Research: Vol. 8:
Iss.
5, Article 4.
DOI: 10.70259/engJER.2024.851816
Available at:
https://digitalcommons.aaru.edu.jo/erjeng/vol8/iss5/4