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...
| Main Authors: | , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/152185 |
| _version_ | 1826126438876577792 |
|---|---|
| author | Anuja J. Narasimhan, Ramarthinam Ramamurty, Upradrasta |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Anuja J. Narasimhan, Ramarthinam Ramamurty, Upradrasta |
| author_sort | Anuja J. |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T06:52:21Z |
| format | Journal Article |
| id | ntu-10356/152185 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:52:21Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-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. |
| 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 |
| title | 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_short | 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 |
| topic | Engineering::Mechanical engineering Spherical Indentation Shape Memory Alloys |
| url | https://hdl.handle.net/10356/152185 |
| work_keys_str_mv | AT anujaj effectsofsuperelasticityandplasticityonthesphericalindentationresponseofshapememoryalloysafiniteelementanalysis AT narasimhanramarthinam effectsofsuperelasticityandplasticityonthesphericalindentationresponseofshapememoryalloysafiniteelementanalysis AT ramamurtyupradrasta effectsofsuperelasticityandplasticityonthesphericalindentationresponseofshapememoryalloysafiniteelementanalysis |