Phase-field simulations of stress-strain behavior in ferromagnetic shape memory alloy Ni[sub 2]MnGa

2008 ◽  
Vol 104 (7) ◽  
pp. 073906 ◽  
Author(s):  
P. P. Wu ◽  
X. Q. Ma ◽  
J. X. Zhang ◽  
L. Q. Chen
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Phase Field ◽  
Ferromagnetic Shape Memory Alloy ◽  
Stress Strain ◽  
Strain Behavior ◽  
Ferromagnetic Shape Memory

Modeling and Experiments for Deformation Under Load in Ni-Mn-Ga Ferromagnetic Shape Memory Alloy

1999 ◽  
Vol 604 ◽  
Author(s):  
S. J. Murray ◽  
S. M. Allen ◽  
R. C. O'Handley
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mechanical Energy ◽  
Constant Load ◽  
Constant Field ◽  
Ferromagnetic Shape Memory Alloy ◽  
Strain Behavior ◽  
Modeling And Experiments ◽  
Orthogonal Field ◽  
Ferromagnetic Shape Memory

AbstractA simple model is proposed to relate strain, stress, field and anisotropy in a ferromagnetic shape memory alloy (FSMA) and experiments were performed to test the validity of the model. The model is presented as applied to the case of orthogonal field and load in a NiMn-Ga FSMA. The model predicts threshold-type strain behavior as field changes at constant load or as load changes with constant field. The measured behavior of strain with stress at constant field approximated the predictions of the model. Field-induced strain remained constant at about 6% with the addition of stress until such a stress was applied that the mechanical energy overcame the anisotropy of the sample and the strain was reduced to 0. The model's predictions of critical strain behavior with applied field at constant stress were qualitatively accurate at some stress levels, but under-predicted the field necessary to produce strain.

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