Finite element simulation of shape memory alloy wires using a user material subroutine: Parametric study on heating rate, conductivity, and heat convection

2014 ◽  
Vol 26 (5) ◽  
pp. 554-572 ◽  
Author(s):  
Amin Alipour ◽  
Mahmoud Kadkhodaei ◽  
Abbas Ghaei
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Finite Element Simulation ◽  
Heating Rate ◽  
Parametric Study ◽  
Heat Convection ◽  
Element Simulation ◽  
User Material Subroutine

Finite element simulation of thermomechanical training on functional stability of shape memory alloy wave spring actuator

2019 ◽  
Vol 30 (8) ◽  
pp. 1239-1251 ◽  
Author(s):  
Jun Wang ◽  
Weihong Zhang ◽  
Jihong Zhu ◽  
Yingjie Xu ◽  
Xiaojun Gu ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Finite Element Simulation ◽  
Residual Deformation ◽  
Integration Scheme ◽  
Functional Stability ◽  
Element Simulation ◽  
Geometric Precision ◽  
Thermomechanical Training

Pre-service thermomechanical training is of great significance to achieve functional stability for shape memory alloy device. This article presents a finite element simulation of the training behavior of a shape memory alloy wave spring actuator using a thermomechanically coupled and finite-strain shape memory alloy model (Wang et al., 2017a). The model is implemented into ABAQUS/Explicit by means of a user-defined material subroutine VUMAT. The introduction of a finite-Hencky-strain return-mapping integration scheme substantially improves the numerical efficiency and stability. Model predictions are validated against the experimental data. The good agreement between both demonstrates the capabilities of the model of well describing the training behavior of shape memory alloy when subjected to large cyclic thermomechanical loading. Simulation results illustrate several primary thermomechanical characteristics during training process, such as the expansion of the phase transformation zone, the accumulation of the residual deformation, and the concentration of the internal stress. The present finite element approach provides a powerful tool in design and optimization of shape memory alloy wave spring actuator, especially to improve the geometric precision and to enhance the two-way shape memory effect.

Finite Element Simulation on Mechanical Behaviors near Crack-Tip in Shape Memory Alloy

2013 ◽  
Vol 405-408 ◽  
pp. 2576-2579
Author(s):  
Bo Zhou ◽  
Jun Lv ◽  
Dong Xue Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Finite Element Simulation ◽  
Crack Tip ◽  
Simulation Method ◽  
Mechanical Behaviors ◽  
Alloy Plate ◽  
Element Simulation

The mechanical behaviors of super-elastic shape memory alloy are formulated based on Auricchios constitutive model. The finite element simulation method for the mechanical behaviors of super-elastic shape memory alloy using the software of ANSYS is introduced. The mechanical behaviors near crack-tip in a shape memory alloy plate with one inclining crack are numerically simulated by finite element method. Results show that the software of ANSYS can simulate the mechanical behaviors of shape memory alloy with crack effectively.

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