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Nonequilibrium dynamics and statistical properties of fracture phenomena

Research Project

Project/Area Number 16K05473
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Mathematical physics/Fundamental condensed matter physics
Research InstitutionOsaka University

Principal Investigator

Yukawa Satoshi  大阪大学, 理学研究科, 准教授 (20292899)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords破壊現象 / 非平衡統計物理学 / 確率モデル / 臨界現象 / 乾燥破壊 / 統計的性質 / ファイバーバンドルモデル / 乾燥破壊の確率モデル / パーコレーション / 非平衡物理 / 計算物理 / 統計力学
Outline of Final Research Achievements

In this project, I investigated fracture phenomena like the formation of a desiccation crack, which is caused by internal stress increment. In order to understand the nature of phenomena from the view point of the nonequilibrium physics, I made a stochastic model and simulated the model by computers. The model is constructed in a two dimensional square lattice. The following properties are imposed on the model: asymmetric redistribution of stress variables, energy dissipation and so on. In addition, we can discuss a fragment shape and fragment size distributions with the present model. This simple stochastic model enables us to discuss the complicated nature of fracture phenomena theoretically. As a result of the simulation, I found critical phenomena similar to ones observed in equilibrium systems. In this case, the critical exponent is varying as changing external parameters. These results were presented in the meeting of the Physical Society of Japan.

Academic Significance and Societal Importance of the Research Achievements

乾燥や体積収縮などによる内部応力の増加に伴い発生する破壊現象に対する簡単な確率モデルを構成できたことは学術的な意義がある。また今後の三次元への研究の展開や応力緩和の効果を考察する上でも使えるモデルとなっておりさらなる展開が期待できる。また、成果としての臨界現象的な振る舞いは、まだ完全に理解はできてはいないが、非平衡模型で臨界的振る舞いが出ること、またパラメーターにより臨界指数が連続的に変わるように見えることなど、学術的に意義深い性質が発見された。この点はさらなる解析が必要である。社会的には直接影響のある成果はないが、この研究を通じて破壊現象の理解が深まることで工学的応用などに繋げたい。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Bifurcation Angle Distribution in the Japanese River Network2019

    • Author(s)
      Yukawa Satoshi、Watanabe Takeru、Hara Kenji
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 88 Issue: 2 Pages: 024901-024901

    • DOI

      10.7566/jpsj.88.024901

    • NAID

      40021810376

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Cellular Braided-stream model による河川成長、及びその分岐角度分布2019

    • Author(s)
      高谷慧, 渡辺壮流, 湯川諭
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 流路の樹状ネットワークの自己組織化モデルにおける合流角度について2019

    • Author(s)
      渡辺壮流, 高谷慧, 湯川諭
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 乾燥破壊現象の確率モデル2018

    • Author(s)
      湯川諭
    • Organizer
      2018年日本物理学会秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Morphological properties of surface crack patterns due to volumetric shrinkage2018

    • Author(s)
      Shin-ichi Ito, and Satoshi Yukawa
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] フェーズフィールド法に基づく乾燥亀裂シミュレーションとその統計的性質2018

    • Author(s)
      伊藤伸一、湯川諭
    • Organizer
      2018年日本物理学会第73回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Statistical Modeling for Desiccation Cracking Based on Shape-Dependent Fragmentation Process2018

    • Author(s)
      Shin-ichi Ito and Satoshi Yukawa
    • Organizer
      APS March Meeting
    • Related Report
      2017 Research-status Report
  • [Presentation] 乾燥収縮破壊の破片形状依存性と統計的モデリング2017

    • Author(s)
      伊藤伸一、湯川諭
    • Organizer
      2017年日本物理学会秋季大会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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