Heat-activated prestressing of NiTiNb shape memory alloy wires

R. Suhail; G. Amato; D. McCrum

doi:10.1016/j.engstruct.2019.110128

Heat-activated prestressing of NiTiNb shape memory alloy wires

R. Suhail, G. Amato^*, D. McCrum

^*Corresponding author for this work

School of Natural and Built Environment

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

217 Downloads (Pure)

Abstract

Pre-strained shape memory alloys (SMAs) can develop significant level of recovery stress (prestress) when heated above their transformation temperature in the constrained conditions. In this study, thermo-mechanical tests were conducted to investigate heat-activated prestressing (HAP) of NiTiNb SMA wires. The tests were conducted to investigate: (1) the effect of pre-strain on reverse transformation temperatures (퐴푠 and 퐴푓) of the NiTiNb SMA; (2) the effect of strain rate and the pre-strain level on HAP; (3) post-HAP behaviour under monotonic and cyclic loading; and (4) reusability of the NiTiNb SMA wires for HAP applications. The digital image correlation technique was used to gain deeper insight into micro-mechanical behaviour of the SMA. The study highlights the complex material behaviour of the NiTiNb SMAs. The results from this study suggest that NiTiNb SMAs can be effectively used for HAP. Recommendations on optimal strain rate for pre-straining NiTiNb SMAs and the optimal pre-strain level for achieving maximum recovery
stress in NiTiNb SMAs are given in this paper.

Original language	English
Article number	110128
Number of pages	15
Journal	Engineering Structures
Volume	206
DOIs	https://doi.org/10.1016/j.engstruct.2019.110128
Publication status	Published - 01 Mar 2020

Keywords

NiTiNb
shape memory alloy
heat activated prestress
recovery stress

ASJC Scopus subject areas

Civil and Structural Engineering

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10.1016/j.engstruct.2019.110128Licence: Unspecified

Heat-activated Prestressing of NiTiNb Shape Memory Alloy Wires
© 2019 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/,which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited.
Accepted author manuscript, 1.91 MBLicence: CC BY-NC-ND

Giuseppina Amato
- g.amatoqub.acuk
- School of Natural and Built Environment - Senior Lecturer
- Environmental Change and Resilience
Person: Academic

Cite this

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title = "Heat-activated prestressing of NiTiNb shape memory alloy wires",

abstract = " Pre-strained shape memory alloys (SMAs) can develop significant level of recovery stress (prestress) when heated above their transformation temperature in the constrained conditions. In this study, thermo-mechanical tests were conducted to investigate heat-activated prestressing (HAP) of NiTiNb SMA wires. The tests were conducted to investigate: (1) the effect of pre-strain on reverse transformation temperatures (퐴푠 and 퐴푓) of the NiTiNb SMA; (2) the effect of strain rate and the pre-strain level on HAP; (3) post-HAP behaviour under monotonic and cyclic loading; and (4) reusability of the NiTiNb SMA wires for HAP applications. The digital image correlation technique was used to gain deeper insight into micro-mechanical behaviour of the SMA. The study highlights the complex material behaviour of the NiTiNb SMAs. The results from this study suggest that NiTiNb SMAs can be effectively used for HAP. Recommendations on optimal strain rate for pre-straining NiTiNb SMAs and the optimal pre-strain level for achieving maximum recoverystress in NiTiNb SMAs are given in this paper.",

keywords = "NiTiNb, shape memory alloy, heat activated prestress, recovery stress",

author = "R. Suhail and G. Amato and D. McCrum",

year = "2020",

month = mar,

day = "1",

doi = "10.1016/j.engstruct.2019.110128",

language = "English",

volume = "206",

journal = "Engineering Structures",

issn = "0141-0296",

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T1 - Heat-activated prestressing of NiTiNb shape memory alloy wires

AU - Suhail, R.

AU - Amato, G.

AU - McCrum, D.

PY - 2020/3/1

Y1 - 2020/3/1

N2 - Pre-strained shape memory alloys (SMAs) can develop significant level of recovery stress (prestress) when heated above their transformation temperature in the constrained conditions. In this study, thermo-mechanical tests were conducted to investigate heat-activated prestressing (HAP) of NiTiNb SMA wires. The tests were conducted to investigate: (1) the effect of pre-strain on reverse transformation temperatures (퐴푠 and 퐴푓) of the NiTiNb SMA; (2) the effect of strain rate and the pre-strain level on HAP; (3) post-HAP behaviour under monotonic and cyclic loading; and (4) reusability of the NiTiNb SMA wires for HAP applications. The digital image correlation technique was used to gain deeper insight into micro-mechanical behaviour of the SMA. The study highlights the complex material behaviour of the NiTiNb SMAs. The results from this study suggest that NiTiNb SMAs can be effectively used for HAP. Recommendations on optimal strain rate for pre-straining NiTiNb SMAs and the optimal pre-strain level for achieving maximum recoverystress in NiTiNb SMAs are given in this paper.

AB - Pre-strained shape memory alloys (SMAs) can develop significant level of recovery stress (prestress) when heated above their transformation temperature in the constrained conditions. In this study, thermo-mechanical tests were conducted to investigate heat-activated prestressing (HAP) of NiTiNb SMA wires. The tests were conducted to investigate: (1) the effect of pre-strain on reverse transformation temperatures (퐴푠 and 퐴푓) of the NiTiNb SMA; (2) the effect of strain rate and the pre-strain level on HAP; (3) post-HAP behaviour under monotonic and cyclic loading; and (4) reusability of the NiTiNb SMA wires for HAP applications. The digital image correlation technique was used to gain deeper insight into micro-mechanical behaviour of the SMA. The study highlights the complex material behaviour of the NiTiNb SMAs. The results from this study suggest that NiTiNb SMAs can be effectively used for HAP. Recommendations on optimal strain rate for pre-straining NiTiNb SMAs and the optimal pre-strain level for achieving maximum recoverystress in NiTiNb SMAs are given in this paper.

KW - NiTiNb

KW - shape memory alloy

KW - heat activated prestress

KW - recovery stress

U2 - 10.1016/j.engstruct.2019.110128

DO - 10.1016/j.engstruct.2019.110128

M3 - Article

SN - 0141-0296

VL - 206

JO - Engineering Structures

JF - Engineering Structures

M1 - 110128

ER -

Heat-activated prestressing of NiTiNb shape memory alloy wires

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Keywords

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Giuseppina Amato

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