Frontiers of Structural and Civil Engineering
>> 2015,
Volume 9,
Issue 4
doi:
10.1007/s11709-015-0300-3
RESEARCH ARTICLE
An extended thermo-mechanically coupled algorithm for simulation of superelasticity and shape memory effect in shape memory alloys
High Performance Computing Laboratory (HPC Lab), School of Civil Engineering, University of Tehran, Tehran 1417613131, Iran
Accepted: 2015-11-19
Available online: 2015-11-26
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Abstract
Thermo-mechanical coupling in shape memory alloys is a very complicated phenomenon. The heat generation/absorption during forward/reverse transformation can lead to temperature-dependent variation of its mechanical behavior in the forms of superelasticity and shape memory effect. However, unlike the usual assumption, slow loading rate cannot guarantee an isothermal process. A two-dimensional thermo-mechanically coupled algorithm is proposed based on the original model of Lagoudas to efficiently model both superelasticity and shape memory effects and the influence of various strain rates, aspect ratios and boundary conditions. To implement the coupled model into a finite element code, a numerical staggered algorithm is employed. A number of simulations are performed to verify the proposed approach with available experimental and numerical data and to assess its efficiency in solving complex SMA problems.
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