Nitinol material is used only in Nonlinear analysis. After selecting Nitinol from the Type drop-down, the following material sections will become available: General, Structural and Nitinol.
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General and Structural
- You can input Young’s modulus, shear modulus, Poisson’s ratio, thermal expansion coefficient, mass density under the General and Structural section.
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Nitinol
- This material property is used for shape memory alloys.
- It needs pressure coefficient
and maximum residual strain 
. - The transformation stresses and temperature can be combined such that the transformation stress can be calculated by using the data specified for autensite to martensite and vice versa.
- Starting stress for transformation from austensite to martensite is SSAS -CAS*TSAS.
- Ending stress for transformation from austensite to martensite is SFAS -CAS*TFAS.
- Starting stress for transformation from martensite to austensite is SSSA -CSA*TSSA.
- Ending stress for transformation from martensite to austensite is SFSA -CSA*TFSA.
- Temperatures should satisfied relation:
TFAS<TSAS<TSSA<TFSA
- When BTAS and BTSA are zero, the material model is linear. When BTAS and BTSA are non-zero, the material model is exponential with BTAS and BTSA as coefficients.