Description of the irreversible deformation of shape-memory materials in terms of the two-level phenomenological model

I. M. Goliboroda, I. V. Kuz'o, K. N. Rusinko

"L'vivs'ka Politekhnika" National University, Ukraine, L'vov, 79013, Russia

Abstract: The two-level phenomenological model of the nonlinear deformation of polycrystals is extended to describe and predict the irreversible deformation of advanced shape-memory materials. The effect of various groups of residual microstresses on the deformation process is taken into account. The model is used to describe and predict deformations of shape-memory materials in cyclic thermomechanical tests, and its effectiveness is demonstrated.

Keywords: martensitic transformation, shape-memory effect, nonlinear deformation, phenomenological model.

UDC: 539.373

Received: 23.07.2003

 English version: Journal of Applied Mechanics and Technical Physics, 2004, 45:6, 878–884

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