Molecular Dynamics Simulations of Shape-Memory Behavior Based on Martensite Transformation and Shear Deformation
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- UEHARA Takuya
- Department of Computational Science and Engineering, Nagoya University
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- TAMAI Takato
- Department of Energy Conversion Science, Kyoto University
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- OHNO Nobutada
- Department of Computational Science and Engineering, Nagoya University
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Abstract
Molecular dynamics simulations of the shape-memory effect are carried out to investigate the atomistic behavior during deformation and shape-recovery processes. The embedded-atom-method potential function and parameters for Ni-Al alloy are applied. The initial configurations of atoms are set on the lattice points of the martensite structure, in which the distribution of the variant orientation is limited to the two-dimensional direction for simplicity. When the shear load is imposed toward the x direction, parallel to the variant interface, the deformation of the variants occurs, and finally, all variants settle into the uniform orientation. The deformed state is maintained after the load is released, and the original shape is recovered through heating and cooling processes because of phase transformation to bcc and martensite. In the loading process, the stress-strain curve exhibits a zigzag shape consisting of repeated stress increase and abrupt release. The interval of the stress peaks is revealed to be smaller as the model size becomes larger. Deformation observed in variant layers seems to occur at the same time at every points in the layer for a small model. However, the simulation with a large model indicates a nucleation and propagation behavior in each layer.
Journal
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- JSME International Journal Series A
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JSME International Journal Series A 49 (3), 300-306, 2006
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390282681471553792
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- NII Article ID
- 110004798963
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- NII Book ID
- AA11179396
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- COI
- 1:CAS:528:DC%2BD28XhtVWhurjE
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- ISSN
- 13475363
- 13447912
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- HANDLE
- 2237/9014
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- NDL BIB ID
- 7976452
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed