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Title: A macroscopic constitutive model for shape-memory alloys: Theory and finite-element simulations
Authors: Thamburaja, P. 
Nikabdullah, N.
Keywords: A. Shape-memory alloys
B. Constitutive behavior
C. Finite elements
Issue Date: 15-Feb-2009
Citation: Thamburaja, P., Nikabdullah, N. (2009-02-15). A macroscopic constitutive model for shape-memory alloys: Theory and finite-element simulations. Computer Methods in Applied Mechanics and Engineering 198 (9-12) : 1074-1086. ScholarBank@NUS Repository.
Abstract: In this work, we develop a non-local and thermo-mechanically-coupled constitutive model for polycrystalline shape-memory alloys (SMAs) capable of undergoing austenite ↔ martensite phase transformations. The theory is developed in the isotropic metal-plasticity setting using fundamental thermodynamic laws and the principle of micro-force balance [E. Fried, M. Gurtin, Dynamic solid-solid transitions with phase characterized by an order parameter, Physica D 72 (1994) 287-308]. The constitutive model is then implemented in the ABAQUS/Explicit (2007) finite-element program by writing a user-material subroutine. The results from the constitutive model and numerical procedure are then compared to representative physical experiments conducted on a polycrystalline rod Ti-Ni undergoing superelasticity. The constitutive model and the numerical simulations are able to reproduce the stress-strain responses from these physical experiments to good accuracy. Experimental strain-temperature-cycling and shape-memory effect responses have also shown to be qualitatively well-reproduced by the developed constitutive model. With the aid of finite-element simulations we also show that during phase transformation, the dependence of the position i.e. the thickness of the austenite-martensite interface on the mesh density is heavily minimized when a non-local constitutive theory is used. © 2008 Elsevier B.V. All rights reserved.
Source Title: Computer Methods in Applied Mechanics and Engineering
ISSN: 00457825
DOI: 10.1016/j.cma.2008.11.016
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