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Constitutive modeling of tension-torsion coupling and tension-compression asymmetry in NiTi shape memory alloys
A three-dimensional phenomenological model based on microplane theory is extended to capture the coupling effects between tension and torsion in complex multiaxial loadings. Inelastic strain in a microplane approach is a component of transformation strain and anisotropic strain. Since the anisotropy effect is induced during martensitic transformation, anisotropic strain is de fined as a function of transformation strain. Out-of-plane strain is induced in simple tension and pure torsion in free-end conditions. Anisotropy tensor is experimentally extracted and is used in the proposed model to predict the behavior in multiaxial loading. The ability of this extended microplane model to predict the tension-torsion coupling effects as well as the induced transformation anisotropic behavior of NiTi shape memory alloys is demonstrated. In addition, ...
R. Mehrabi, M. Kadkhodaie, M. Elahinia, “Constitutive modeling of tension-torsion coupling and
tension-compression asymmetry in NiTi shape memory alloys”, Smart Materials and Structures,
23 (7), 75021-75035, 2014.
منبع :  http://iopscience.iop.org/0964-1726/23/7/075021    |    1393/6/16

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