Myths and truths of nitinol mechanics: elasticity and tension–compression asymmetry
Two prevalent myths of Nitinol mechanics are examined:(1) Martensite is more compliant
than austenite;(2) Texture-free Nitinol polycrystals do not exhibit tension–compression
asymmetry. By reviewing existing literature, the following truths are revealed:(1) Martensite
crystals may be more compliant, equally stiff, or stiffer than austenite crystals, depending on
the orientation of the applied load. The Young's Modulus of polycrystalline Nitinol is not a
fixed number—it changes with both processing and in operando deformations. Nitinol …
than austenite;(2) Texture-free Nitinol polycrystals do not exhibit tension–compression
asymmetry. By reviewing existing literature, the following truths are revealed:(1) Martensite
crystals may be more compliant, equally stiff, or stiffer than austenite crystals, depending on
the orientation of the applied load. The Young's Modulus of polycrystalline Nitinol is not a
fixed number—it changes with both processing and in operando deformations. Nitinol …
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