In this paper, modeling and numerical analysis of a three dimensional shell structure made of shape memory
alloy (SMA) are introduced. As a new smart material, SMA material has been applied in many fields due to two
significant macroscopic phenomena which are called the shape memory effect (SME) and pseudoelasticity. The
material of SMA exhibits two-way shape memory effect (TWSME) after undergoing especial heat treatment and
thermo-mechanical training. This work investigates the numerical simulation and application of the SMA
component: SMA strip, which has been pre-curved in the room temperature. The component is expected to
extend upon heating and shorten on cooling along the curve. Hence the shape memory effect can be used to
change the shape of the structure. The return mapping algorithm of the 3-D SMA thermomechanical constitutive
equations based on Boyd-Lagoudas model is used in the finite element analysis to describe the material features
of the SMA. In this paper, the ABAQUS finite element program has been utilized with a user material subroutine
(UMAT) which is written in the FORTRAN code for the modeling of the SMA strip. The SMA component
which has a certain initial transformation strain can emerge considerable deflection during the reverse phase
transformation inducing by the temperature.
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