内部欠陥構造発展の大規模計算によるバルクナノメタルの力学特性解析

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Author: 下川, 智嗣ほか

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Publication date: 2015-06-17

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Note (General)：: 金沢大学理工研究域機械工学系バルクナノメタル（結晶粒径がサブミクロン以下の金属材料）は，通常の粗大粒材料とは異なる力学特性を示すことが知られている．そこで，バルクナノメタル中の複雑な格子欠陥の発展を，大規模な分子動力学計算と結晶塑性理論を用いて表現し，以下の現象について検討を行った．①粒界が持つ固有...

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Material Type: 文書・図像類
Title: 内部欠陥構造発展の大規模計算によるバルクナノメタルの力学特性解析
Author/Editor: 下川, 智嗣
Simokawa, Tomotsugu
Author Heading: 下川, 智嗣
Simokawa, Tomotsugu
Publication Date: 2015-06-17
Publication Date (W3CDTF): 2015-06-17
Alternative Title: Analysis of mechanical properties of bulk nanostructured metals by large-scale computing on the defects evolution
バルクナノメタル: 常識を覆す新しい構造材料の科学
Bulk Nanostructured Metals: New Metallurgy of Novel Structural Materials
Periodical title: 平成26(2014)年度科学研究費補助金新学術領域研究(研究領域提案型) 研究成果報告書 = 2014 Fiscal Year Final Research Report
No. or year of volume/issue: 2010-04-01 - 2015-03-31
Volume: 2010-04-01 - 2015-03-31
Pages: 6p.-
Text Language Code: jpn
Subject Heading: 計算力学
力学特性
ナノ材料
粒界
原子シミュレーション
結晶塑性解析
寸法効果
転位
Target Audience: 一般
Note (General): 金沢大学理工研究域機械工学系
バルクナノメタル（結晶粒径がサブミクロン以下の金属材料）は，通常の粗大粒材料とは異なる力学特性を示すことが知られている．そこで，バルクナノメタル中の複雑な格子欠陥の発展を，大規模な分子動力学計算と結晶塑性理論を用いて表現し，以下の現象について検討を行った．①粒界が持つ固有の転位源能力とその静水圧依存性を検討し，バルクナノメタルの塑性変形能力を検討した．②転位と粒界の相互作用が及ぼすき裂先端力学場に対する影響の粒径依存性を調査し，バルクナノメタルの破壊特性を検討した．③内部欠陥構造の生成と消滅に基づく塑性変形伝ぱプロセスの粒径依存性を調査し，バルクナノメタルの強度－延性特性を検討した．
In bulk nanostructured metals, the volume fraction of grain boundary and interface (plane defects) rapidly increases. Thus, it is very important to investigate the development of lattice defects through grain boundaries, which is closely related with the anomalous mechanical characteristics of BNMs. In this study, the development of complicated interior lattice defects in BNMs was expressed by the large-scale calculation by the atomistic model which can directly express atomic structure of grain boundary (molecular dynamics) and the continuum modeling considering the effect of grain boundaries (crystal plasticity theory), and we investigated the grain size dependence of the following phenomena: (1) dislocation emissions from grain boundaries, (2) the crack tip plasticity based on the interaction between dislocations and grain boundaries, and (3) the propagation mechanism of the plastic deformation based on the formation and dissipation of lattice defects.
研究課題/領域番号:22102007, 研究期間(年度):2010-04-01 - 2015-03-31
DOI: 10.24517/00052692
Access Restrictions: 限定公開
Related Material: https://kaken.nii.ac.jp/search/?qm=40361977
https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-22102007/
https://kaken.nii.ac.jp/report/KAKENHI-PLANNED-22102007/22102007seika/
https://kaken.nii.ac.jp/ja/grant/KAKENHI-AREA-2201/
https://kaken.nii.ac.jp/en/grant/KAKENHI-AREA-2201/
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 金沢大学 : 金沢大学学術情報リポジトリKURA