Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis

Instrumented indentation is particularly useful for characterizing the mechanical behavior of shape memory alloys (SMAs), which are often used as 'small volume' elements such as thin films or wires. Deciphering the measured indentation response, which is as such difficult for elastic-plast...

Full description

Saved in:
Bibliographic Details
Main Authors: Anuja J., Narasimhan, Ramarthinam, Ramamurty, Upradrasta
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2021
Subjects:
Online Access:https://hdl.handle.net/10356/152185
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-152185
record_format dspace
spelling sg-ntu-dr.10356-1521852021-07-21T05:13:22Z Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis Anuja J. Narasimhan, Ramarthinam Ramamurty, Upradrasta School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Spherical Indentation Shape Memory Alloys Instrumented indentation is particularly useful for characterizing the mechanical behavior of shape memory alloys (SMAs), which are often used as 'small volume' elements such as thin films or wires. Deciphering the measured indentation response, which is as such difficult for elastic-plastic materials due to the inhomogeneous state of stress underneath the indenter, becomes more complex for SMAs owing to the simultaneous occurrence of stress induced martensite transformation (SIMT) in conjunction with plastic deformation. In this work, a constitutive model that is able to capture the coupled nature of phase transformation and plastic deformation is employed to study, through finite element analyses, the spherical indentation behavior of SMAs at a temperature above the austenite finish temperature, Af. It is found that the concurrent development of plastic yielding and SIMT leads to slower evolution of martensite volume and a smaller transformed zone size. Also, in the absence of plastic yielding, the proportion of depth recovered by superelasticity is fairly constant. It is also observed, from a systematic comparison with a conventional elastic-plastic material, that the presence of the transformed zone significantly alters the stress distribution beneath the indenter. R Narasimhan would like to gratefully acknowledge the Science and Engineering Research Board (Government of India) for financial support under the JC Bose Fellowship scheme. 2021-07-21T05:13:22Z 2021-07-21T05:13:22Z 2019 Journal Article Anuja J., Narasimhan, R. & Ramamurty, U. (2019). Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis. Smart Materials and Structures, 28(3), 035028-. https://dx.doi.org/10.1088/1361-665X/aaff88 0964-1726 https://hdl.handle.net/10356/152185 10.1088/1361-665X/aaff88 2-s2.0-85062498957 3 28 035028 en Smart Materials and Structures © 2019 IOP Publishing Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Spherical Indentation
Shape Memory Alloys
spellingShingle Engineering::Mechanical engineering
Spherical Indentation
Shape Memory Alloys
Anuja J.
Narasimhan, Ramarthinam
Ramamurty, Upradrasta
Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
description Instrumented indentation is particularly useful for characterizing the mechanical behavior of shape memory alloys (SMAs), which are often used as 'small volume' elements such as thin films or wires. Deciphering the measured indentation response, which is as such difficult for elastic-plastic materials due to the inhomogeneous state of stress underneath the indenter, becomes more complex for SMAs owing to the simultaneous occurrence of stress induced martensite transformation (SIMT) in conjunction with plastic deformation. In this work, a constitutive model that is able to capture the coupled nature of phase transformation and plastic deformation is employed to study, through finite element analyses, the spherical indentation behavior of SMAs at a temperature above the austenite finish temperature, Af. It is found that the concurrent development of plastic yielding and SIMT leads to slower evolution of martensite volume and a smaller transformed zone size. Also, in the absence of plastic yielding, the proportion of depth recovered by superelasticity is fairly constant. It is also observed, from a systematic comparison with a conventional elastic-plastic material, that the presence of the transformed zone significantly alters the stress distribution beneath the indenter.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Anuja J.
Narasimhan, Ramarthinam
Ramamurty, Upradrasta
format Article
author Anuja J.
Narasimhan, Ramarthinam
Ramamurty, Upradrasta
author_sort Anuja J.
title Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
title_short Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
title_full Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
title_fullStr Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
title_full_unstemmed Effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
title_sort effects of superelasticity and plasticity on the spherical indentation response of shape memory alloys : a finite element analysis
publishDate 2021
url https://hdl.handle.net/10356/152185
_version_ 1707050437404786688