期刊
SHAPE MEMORY AND SUPERELASTICITY
卷 2, 期 3, 页码 264-271出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s40830-016-0074-z
关键词
Nickel-titanium; Texture; Anisotropy; Shape memory alloy
资金
- NSF [DGE-1057607]
- DOE-BES [DE-SC0010594]
- NSF-CAREER from CMMI-MoMS [1454668]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1454668] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0010594] Funding Source: U.S. Department of Energy (DOE)
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 martensite prefers to behave stiffer under compressive loads and more compliant under tensile loads. (2) Inelastic Nitinol martensite deformation in and of itself is asymmetric, even for texture-free polycrystals. Texture-free Nitinol polycrystals also exhibit tension-compression transformation asymmetry.
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