| Project/Area Number |
26790081
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Computational science
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 転位 / 離散転位動力学 / マルチスケール / 多結晶 / 弾性異方性 / 離散転位塑性 / 多結晶金属 / 並列計算 / 応力ーひずみ関係 / 均質化 / 重ね合わせの原理 |
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| Outline of Final Research Achievements |
A multiscale polycrystal dislocation plasticity model was developed by applying the superposition principle and homogenization theory to 3D dislocation dynamics. The model was then implemented into a parallel computer environment using a hybrid parallelization model. The stress field in a bi-crystal with a dislocation loop was calculated. The numerical result agrees well with the analytical solution.
Plastic deformation of a copper polycrystal was simulated. The flow stress calculated with the elastic anisotropy becomes higher than that calculated with the elastic isotropy. In order to reveal the mechanism, the force acting on dislocations was calculated. It could be found that, the stress arisen from the externally applied deformation (strain) in elastically anisotropic single crystals is larger than that in elastically isotropic single crystals. In polycrystals, dislocation sources with low Schmid factors are activated by the stress concentration at crystal grain boundaries.
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