A phenomenological constitutive model of characterization for the heating and cooling transformations process of nickel-titanium wires using Datastudio 1.9.8

SM Longela, Oscar Philander and Mornay Riddles

Advancement in Science and Technology Research
Published: December 18 2014
Volume 1, Issue 2
Pages 27-34

Abstract

This paper presents a three-dimensional constitutive model for a shape-memory alloy that generalizes the behaviour of Nickel-Titanium transformation whilst subjected to heat, then cooling processes. This model is able to predict the behaviour of Shape Memory Alloys (SMAs) wires under complex thermo-mechanical loadings by curve-fitting heating and cooling curves sensed with the Data logger GLX using the DataStudio 1.9.8 package. The phenomenological model for SMAs was investigated to better model their behaviour in cases where temperature and stress states change simultaneously. This model was applied on a 3D printed artificial finger which mimics an actual human finger.

Keywords: Shape memory alloys, nickel-titanium, phenomenological model.

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