| Project/Area Number |
21560100
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Keio University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
AOYAGI Yoshiteru 独立法人日本原子力研究開発機構, 原子力基礎工学研究部門, 研究員 (70433737)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 材料設計・プロセス・物性・評価 / 非線形計算固体力学 / 超微細粒金属 / マルチスケール / 結晶塑性 / GN転位 / 均質化法 / 降伏点降下 / リューダース帯 / バイモーダル構造 / 超徴細粒金属 / 寸法効果 |
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| Research Abstract |
In this study, it has been succeeded that peculiar mechanical behaviors occurring in f. c. c. ultrafine-grained metals, i. e., increase of strength and decrease of ductility with decrease of grain size, yield stress drop and propagation of Luders band are computationally reproduced by using a critical resolved shear stress model proposed newly for situation of dislocation exhaustion and by developing a multiscale crystal plasticity model bridging three hierarchical scales, i. e., dislocation structure, grain aggregates and macroscopic structure through the homogenization method. Moreover, a mechanism of ductility improvement of bimodal structures with coarse grains dispersed in ultrafine-grained matrix is also discussed.
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