2015 Fiscal Year Final Research Report
Development of multiscale polycrystal plasticity model based on discrete dislocation dynamics
| 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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| 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 |
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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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| Free Research Field |
計算材料科学
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