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Challenge to predict elaborate failures of structures using a novel multiscale-multistage fracture theory

Research Project

Project/Area Number 22KJ0233
Project/Area Number (Other) 22J10932 (2022)
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeMulti-year Fund (2023)
Single-year Grants (2022)
Section国内
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionTohoku University

Principal Investigator

韓 霽珂  東北大学, 工学研究科, 特別研究員(PD)

Project Period (FY) 2023-03-08 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2023: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2022: ¥800,000 (Direct Cost: ¥800,000)
Keywords損傷モデル / 有限被覆法 / マルチステージ / 破壊 / マルチスケール
Outline of Research at the Start

巨大地震発生時に想定される人命危機や交通網寸断などの被害対策として,構造物に生ずる部材のき裂進展,強度低下,崩壊といった現象を連 続的に評価することが求められる.本研究では,部材のき裂進展(ミクロ)と構造物全体の強度予測(マクロ)という異なる破壊スケールや, 構造物が健全な状態から崩壊に至るまでの異なる破壊ステージといった,スケール・ステージ間の相互影響を包括的に評価可能なマルチスケー ル・マルチステージ破壊理論を連続体力学の枠組みで創成する.また,提案手法を用いた数値シミュレーションを実施し,類似被害との比較・ 検討を行い,土木分野における補修・点検および防災・減災への応用を目指す.

Outline of Annual Research Achievements

本研究では,大変形や部材分離に伴う大回転問題を考慮した,破壊力学及び損傷力学の利点を併せ持つ遷移理論を構築した.まず,連続体力学における有限変形の枠組みにおいて,任意き裂の発生・進展・分岐をエネルギー最小化問題の解として予測する「phase-fieldき裂モデル(PFモデル)」の定式化を行った.PFモデルは不連続き裂面を正則化して 連続的な損傷領域として表現するため,構造物の崩壊で想定される部材の分離を表現することが不可能であった.そのため,定式化したPFモデルに,状態変数や物理量の不連続性を実現する「有限被覆法」の概念を統合し,き裂遷移理論を構築した.これにより,任意き裂進展問題はエネルギー最小化問題の解として予測する一方で,き裂経路は不連続なき裂面として記述される遷移理論が完成した. 得られた遷移理論をインハウスの有限要素プログラムへの実装を行い,モード1やモード2破壊試験などの数値シミュレーションを実施し,提案手法の性能や妥当性の確認を行った.
その後,提案手法を動的問題・弾塑性問題への拡張を行った.具体的には,塑性ひずみ・運動・散逸エネルギーを考慮したエネルギー保存則に対して,変分原理を用いた勾配損傷モデルの定式化を再度行った.これをインハウスの有限要素プログラムへと実装した上で,陰的き裂から陽的き裂へと遷移させるアルゴリズムの改良を適宜行った.提案手法は,塑性・損傷の双方に対して非局所手法を採用しているため,メッシュ依存性が小さいという利点がある一方で,陰的き裂(剛性低下要素)は陽的き裂へと遷移するため,従来法で課題となっている要素の破綻による数値シミュレーションの発散を抑制する.これらの改良を経て,提案手法は不連続き裂面を有する三次元動的・弾塑性破壊の数値シミュレーションが可能となった. これらの研究成果は,国内外の学会および学術論文として発表している.

Report

(2 results)
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (15 results)

All 2024 2023 2022

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 6 results) Presentation (8 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] A numerical simulation method combining gradient damage model and finite cover method for dynamic fracture2024

    • Author(s)
      平山 大悟、韓 霽珂、森口 周二、寺田 賢二郎
    • Journal Title

      Transactions of the Japan Society for Computational Engineering and Science

      Volume: 2024 Issue: 0 Pages: 20240001-20240001

    • DOI

      10.11421/jsces.2024.20240001

    • ISSN
      1344-9443, 1347-8826
    • Year and Date
      2024-01-15
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Diffusive-discrete crack transition without remeshing achieved by extended B-spline-based implicit material point method2024

    • Author(s)
      Sugai Riichi、Han Jike、Moriguchi Shuji、Terada Kenjiro
    • Journal Title

      Computer Methods in Applied Mechanics and Engineering

      Volume: 421 Pages: 116771-116771

    • DOI

      10.1016/j.cma.2024.116771

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crack phase‐field enhanced finite cover method for dynamic fracture at finite strain2023

    • Author(s)
      Han Jike、Hirayama Daigo、Shintaku Yuichi、Moriguchi Shuji、Terada Kenjiro
    • Journal Title

      International Journal for Numerical Methods in Engineering

      Volume: 125 Issue: 2

    • DOI

      10.1002/nme.7371

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Extended B-spline-based implicit material point method enhanced by F-bar projection method to suppress pressure oscillation.2023

    • Author(s)
      Sugai, R., Han, J., Yamaguchi, Y., Moriguchi, S., Terada, K.
    • Journal Title

      International Journal for Numerical Methods in Engineering

      Volume: - Issue: 11 Pages: 2423-2448

    • DOI

      10.1002/nme.7216

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Gradient damage model for ductile fracture introducing degradation of damage hardening modulus: implementation and experimental investigations.2023

    • Author(s)
      Han, J., Matsubara, S., Nishi, S., Takada, K., Muramatsu, M., Omiya, M., Ogawa, K., Oide, K., Kobayashi, T., Murata, M., Moriguchi, S., Terada, K.
    • Journal Title

      International Journal of Fracture

      Volume: 240 Issue: 2 Pages: 183-208

    • DOI

      10.1007/s10704-022-00681-9

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A transition scheme from diffusive to discrete crack topologies at finite strain during the course of a staggered iterative procedure.2023

    • Author(s)
      Han, J., Shintaku, Y., Moriguchi, S., Terada, K.
    • Journal Title

      International Journal for Numerical Methods in Engineering

      Volume: 124(6) Issue: 6 Pages: 1405-1433

    • DOI

      10.1002/nme.7169

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Variational crack phase-field model for ductile fracture with elastic and plastic damage variables.2022

    • Author(s)
      Han, J., Matsubara, S., Moriguchi, S., Terada, K.
    • Journal Title

      Computer Methods in Applied Mechanics and Engineering

      Volume: 400 Pages: 115577-115577

    • DOI

      10.1016/j.cma.2022.115577

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Crack phase-field enhanced finite cover method realizing diffusive-discrete crack transition2024

    • Author(s)
      Han Jike、Shintaku Yuichi、Moriguchi Shuji、Terada Kenjiro
    • Organizer
      The 16th World Congress on Computational Mechanics and 4th Pan American Congress on Computational Mechanics (WCCM-PANACM2024)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] On the transition from diffusive to discrete crack topologies in crack phase-field model2023

    • Author(s)
      Han Jike、Shintaku Yuichi、Moriguchi Shuji、Terada Kenjiro
    • Organizer
      The 17th International Conference on Computational Plasticity, Fundamentals and Applications (COMPLAS2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A transition scheme from diffusive to discrete crack topologies realized by crack phase-field-enhanced finite cover method2023

    • Author(s)
      Han Jike、Shintaku Yuichi、Moriguchi Shuji、Terada Kenjiro
    • Organizer
      The 17th U.S. National Congress on Computational Mechanics (USNCCM17)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] On the representation of discrete crack surfaces in crack phase-field model realized by finite cover method2023

    • Author(s)
      Han Jike、Shintaku Yuichi、Moriguchi Shuji、Terada Kenjiro
    • Organizer
      The 28th Computational Engineering Conference of JSCES
    • Related Report
      2023 Annual Research Report
  • [Presentation] CRACK PHASE-FIELD MODEL INTRODUCING EXPLICIT CRACK SURFACES2022

    • Author(s)
      Jike Han, Yuichi Shintaku, Shuji Moriguchi, Kenjiro Terada
    • Organizer
      USACM Thematic Conference on Meshfree and Novel Finite Elements with Applications (MFEM)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Variationally consistent crack phase-field formulation for ductile fracture2022

    • Author(s)
      Jike Han, Seishiro Matsubara, Shuji Moriguchi, Kenjiro Terada
    • Organizer
      15th World Congress on Computational Mechanics & 8th Asian Pacific Congress on Computational Mechanics
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crack propagation simulations of advanced high strength steel sheet using crack phase-field model2022

    • Author(s)
      韓 霽珂,松原 成志朗,西紳之介,高田賢治,村松 眞由,大宮 正毅,小川 賢介,生出 佳,小林 卓哉,岡東 寿明,森口周二,寺田賢二郎
    • Organizer
      第27回計算工学講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A variational formulation of crack phase-field modeling for ductile fracture equipped two damage variables2022

    • Author(s)
      韓 霽珂,松原 成志朗,森口 周二,寺田 賢二郎
    • Organizer
      第25回応用力学シンポジウム
    • Related Report
      2022 Annual Research Report

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Published: 2022-04-28   Modified: 2024-12-25  

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