SMA pseudoelastic finite strains. Theory and numerical application

Article Abstract:

A tridimensional finite element model of isothermal pseudoelastic deformations is suggested to assess and forecast the behavior of shape memory alloys (SMA). The mechanical modeling is based on a formulation in a non-material rotating frame in order to perform finite strain estimates. To ensure the convergence of the equilibrium equation solving approach, the construction of an efficient tangent operator with the stress variable calculation algorithm is described. The results as well as the advantages of the proposed model are discussed.

Models, Usage, Deformations (Mechanics), Deformation, Finite element method

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Crystallographic attributes of a shape-memory alloy

Article Abstract:

Suggestions for the development of new shape memory alloys (SMA) based on the reasons in the crystallography that make SMAs special among martensites and nickel-titanium special among SMAs are presented. The restrictions imposed on the crystallography of martensic materials in terms of their self-accommodating behavior, ability to form large class of coherent microstructures and ability to deform by modifying microstructure at relatively little stresses, are discussed.

Research, Crystallography

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