Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation
Recent compression tests of NiTi pillars of a wide range of diameters have shown significant size dependency in the strain recovered upon unloading. In this paper, we propose a numerical model supporting the previously proposed explanation that the external Ti oxide layer may be responsible for the...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Elsevier
2017
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| Online Access: | http://hdl.handle.net/1721.1/108120 https://orcid.org/0000-0001-6339-2708 |
| _version_ | 1826206683595014144 |
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| author | Qiao, Lei Radovitzky, Raul A |
| author2 | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics |
| author_facet | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Qiao, Lei Radovitzky, Raul A |
| author_sort | Qiao, Lei |
| collection | MIT |
| description | Recent compression tests of NiTi pillars of a wide range of diameters have shown significant size dependency in the strain recovered upon unloading. In this paper, we propose a numerical model supporting the previously proposed explanation that the external Ti oxide layer may be responsible for the loss of superelasticity in the small pillars. The shape memory alloy at the center of the pillar is described using a nonlocal superelastic model, whereas the Ti oxide layer is modeled as elastoplastic. Voigt average analysis and finite element calculations are compared to experiments for the available range of pillar sizes. The simulation results also suggest a size-dependent strain hardening due to the constraint on the phase transformation effected by the confining Ti oxide layer. |
| first_indexed | 2024-09-23T13:36:57Z |
| format | Article |
| id | mit-1721.1/108120 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:36:57Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1081202022-09-28T15:03:55Z Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation Qiao, Lei Radovitzky, Raul A Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Radovitzky,Raul Qiao, Lei Radovitzky, Raul A Recent compression tests of NiTi pillars of a wide range of diameters have shown significant size dependency in the strain recovered upon unloading. In this paper, we propose a numerical model supporting the previously proposed explanation that the external Ti oxide layer may be responsible for the loss of superelasticity in the small pillars. The shape memory alloy at the center of the pillar is described using a nonlocal superelastic model, whereas the Ti oxide layer is modeled as elastoplastic. Voigt average analysis and finite element calculations are compared to experiments for the available range of pillar sizes. The simulation results also suggest a size-dependent strain hardening due to the constraint on the phase transformation effected by the confining Ti oxide layer. United States. Army Research Office (DAAD-19–02-D-0002) 2017-04-13T17:50:09Z 2017-04-13T17:50:09Z 2013-07 2013-07 Article http://purl.org/eprint/type/JournalArticle 1359-6454 1873-2453 http://hdl.handle.net/1721.1/108120 Qiao, Lei and Radovitzky, Raul. “Investigation of the Role of Ti Oxide Layer in the Size-Dependent Superelasticity of NiTi Pillars: Modeling and Simulation.” Acta Materialia 61, no. 16 (September 2013): 6213–6221. © 2013 Acta Materialia Inc https://orcid.org/0000-0001-6339-2708 en_US http://dx.doi.org/10.1016/j.actamat.2013.07.004 Acta Materialia Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Prof. Radovitzky via Barbara Williams |
| spellingShingle | Qiao, Lei Radovitzky, Raul A Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation |
| title | Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation |
| title_full | Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation |
| title_fullStr | Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation |
| title_full_unstemmed | Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation |
| title_short | Investigation of the role of Ti oxide layer in the size-dependent superelasticity of NiTi pillars: Modeling and simulation |
| title_sort | investigation of the role of ti oxide layer in the size dependent superelasticity of niti pillars modeling and simulation |
| url | http://hdl.handle.net/1721.1/108120 https://orcid.org/0000-0001-6339-2708 |
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