Complex transformation field created by geometrical gradient design of NiTi shape memory alloy

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Abstract

Owing to geometrical non-uniformity, geometrically graded shape memory alloy (SMA) structures by design have the ability to exhibit different and novel thermal and mechanical behaviors compared to geometrically uniform conventional SMAs. This paper reports a study of the pseudoelastic behavior of geometrically graded NiTi plates. This geometrical gradient creates partial stress gradient over stress-induced martensitic transformation, providing enlarged stress controlling interval for shape memory actuation. Finite element modeling framework has been established to predict the deformation behavior of such structures in tensile loading cycles, which was validated by experiments. The modeling results show that the transformation mostly propagates along the gradient direction as the loading level increases.

Original languageEnglish
Article number1740011
JournalFunctional Materials Letters
Volume10
Issue number1
DOIs
Publication statusPublished - 1 Feb 2017

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Shape memory effect
Martensitic transformations
Experiments

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title = "Complex transformation field created by geometrical gradient design of NiTi shape memory alloy",
abstract = "Owing to geometrical non-uniformity, geometrically graded shape memory alloy (SMA) structures by design have the ability to exhibit different and novel thermal and mechanical behaviors compared to geometrically uniform conventional SMAs. This paper reports a study of the pseudoelastic behavior of geometrically graded NiTi plates. This geometrical gradient creates partial stress gradient over stress-induced martensitic transformation, providing enlarged stress controlling interval for shape memory actuation. Finite element modeling framework has been established to predict the deformation behavior of such structures in tensile loading cycles, which was validated by experiments. The modeling results show that the transformation mostly propagates along the gradient direction as the loading level increases.",
keywords = "functionally graded material (FGM), geometrical gradient, martensitic transformation, NiTi, pseudoelasticity, Shape memory alloy (SMA)",
author = "Reza Bakhtiari and Shariat, {Bashir S.} and Fakhrodin Motazedian and Zhigang Wu and Junsong Zhang and Hong Yang and Yinong Liu",
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AU - Bakhtiari, Reza

AU - Shariat, Bashir S.

AU - Motazedian, Fakhrodin

AU - Wu, Zhigang

AU - Zhang, Junsong

AU - Yang, Hong

AU - Liu, Yinong

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Owing to geometrical non-uniformity, geometrically graded shape memory alloy (SMA) structures by design have the ability to exhibit different and novel thermal and mechanical behaviors compared to geometrically uniform conventional SMAs. This paper reports a study of the pseudoelastic behavior of geometrically graded NiTi plates. This geometrical gradient creates partial stress gradient over stress-induced martensitic transformation, providing enlarged stress controlling interval for shape memory actuation. Finite element modeling framework has been established to predict the deformation behavior of such structures in tensile loading cycles, which was validated by experiments. The modeling results show that the transformation mostly propagates along the gradient direction as the loading level increases.

AB - Owing to geometrical non-uniformity, geometrically graded shape memory alloy (SMA) structures by design have the ability to exhibit different and novel thermal and mechanical behaviors compared to geometrically uniform conventional SMAs. This paper reports a study of the pseudoelastic behavior of geometrically graded NiTi plates. This geometrical gradient creates partial stress gradient over stress-induced martensitic transformation, providing enlarged stress controlling interval for shape memory actuation. Finite element modeling framework has been established to predict the deformation behavior of such structures in tensile loading cycles, which was validated by experiments. The modeling results show that the transformation mostly propagates along the gradient direction as the loading level increases.

KW - functionally graded material (FGM)

KW - geometrical gradient

KW - martensitic transformation

KW - NiTi

KW - pseudoelasticity

KW - Shape memory alloy (SMA)

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