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hape Memory Effect Behavior of NiTi Torque Tubes in Torsion
n order to simulate the torsional behavior of NiTi torque tubes, two different 3D thermo-mechanical constitutive models are utilized. Firstly, an available incremental constitutive model is used in which a return mapping algorithm is implemented to numerically calculate the strains for any applied stresses. Secondly, Microplane theory is employed based on which 1D constitutive laws are considered for associated stress and strain components on any arbitrary plane passing through a material point followed by a homogenization process to generalize the 1D equations to a 3D macroscopic model. Both of the constitutive models are implemented in ABAQUS by developing UMAT.
R. Mehrabi, M. Kadkhodaie, M. Taheri, M. Elahinia, “Shape Memory Effect Behavior of NiTi Torque Tubes in Torsion”, SMASIS2012-8243, pp. 571-575, Stone Mountain, Georgia, USA, 2012.
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