Energetics of macroscopic helical domain in different tube geometries and loading

Superelastic NiTi polycrystalline shape memory alloy tubes, when subject to slow quasistatic stretching, transform to a high strain phase by the formation and growth of a macroscopic helix-shaped domain as deformation progresses. This paper performed an experimental study on the effects of the ex...

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Main Authors: Sun Q.P., Zhou R.
Format: Article
Language:English
Published: EDP Sciences 2010-06-01
Series:EPJ Web of Conferences
Subjects:
Online Access:http://dx.doi.org/10.1051/epjconf/20100627003
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spelling doaj-ff391178106246758b4650acdb3e24662021-08-02T03:36:23ZengEDP SciencesEPJ Web of Conferences2100-014X2010-06-0162700310.1051/epjconf/20100627003Energetics of macroscopic helical domain in different tube geometries and loadingSun Q.P.Zhou R.Superelastic NiTi polycrystalline shape memory alloy tubes, when subject to slow quasistatic stretching, transform to a high strain phase by the formation and growth of a macroscopic helix-shaped domain as deformation progresses. This paper performed an experimental study on the effects of the external applied nominal strain and the tube geometry (tube radius R, wall-thickness h and length L) on the helical domains in isothermal stretching of the tubes. The evolution of the macroscopic domains with the applied strain in different tube geometries are quantified by in-situ optical measurement. We demonstrate that the equilibrium shape of the macroscopic helical domain and its evolution are governed by the competition between the domain front energy and the elastic-misfit bending strain energy of the tube system. The former favors a short helical domain, while the latter favors a long slim helical domain. The experimental results provided basic physical and experimental foundations for further modelling and quantification of the macroscopic domain morphology evolution in tube geometries. http://dx.doi.org/10.1051/epjconf/20100627003NiTi shape memory alloymartensitic phase transformationmacroscopic helical domainstube geometrydomain front energy and misfit bending strain energy
collection DOAJ
language English
format Article
sources DOAJ
author Sun Q.P.
Zhou R.
spellingShingle Sun Q.P.
Zhou R.
Energetics of macroscopic helical domain in different tube geometries and loading
EPJ Web of Conferences
NiTi shape memory alloy
martensitic phase transformation
macroscopic helical domains
tube geometry
domain front energy and misfit bending strain energy
author_facet Sun Q.P.
Zhou R.
author_sort Sun Q.P.
title Energetics of macroscopic helical domain in different tube geometries and loading
title_short Energetics of macroscopic helical domain in different tube geometries and loading
title_full Energetics of macroscopic helical domain in different tube geometries and loading
title_fullStr Energetics of macroscopic helical domain in different tube geometries and loading
title_full_unstemmed Energetics of macroscopic helical domain in different tube geometries and loading
title_sort energetics of macroscopic helical domain in different tube geometries and loading
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2010-06-01
description Superelastic NiTi polycrystalline shape memory alloy tubes, when subject to slow quasistatic stretching, transform to a high strain phase by the formation and growth of a macroscopic helix-shaped domain as deformation progresses. This paper performed an experimental study on the effects of the external applied nominal strain and the tube geometry (tube radius R, wall-thickness h and length L) on the helical domains in isothermal stretching of the tubes. The evolution of the macroscopic domains with the applied strain in different tube geometries are quantified by in-situ optical measurement. We demonstrate that the equilibrium shape of the macroscopic helical domain and its evolution are governed by the competition between the domain front energy and the elastic-misfit bending strain energy of the tube system. The former favors a short helical domain, while the latter favors a long slim helical domain. The experimental results provided basic physical and experimental foundations for further modelling and quantification of the macroscopic domain morphology evolution in tube geometries.
topic NiTi shape memory alloy
martensitic phase transformation
macroscopic helical domains
tube geometry
domain front energy and misfit bending strain energy
url http://dx.doi.org/10.1051/epjconf/20100627003
work_keys_str_mv AT sunqp energeticsofmacroscopichelicaldomainindifferenttubegeometriesandloading
AT zhour energeticsofmacroscopichelicaldomainindifferenttubegeometriesandloading
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