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Development of a seamless simulation that that enables consistent transition of fracture stages from crack initiation to propagation

Research Project

Project/Area Number 20K19812
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 60100:Computational science-related
Research InstitutionUniversity of Tsukuba

Principal Investigator

Yuichi Shintaku  筑波大学, システム情報系, 助教 (80780064)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Discontinued (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords破壊力学 / 損傷力学 / 計算力学 / き裂進展解析 / 非局所アプローチ / Micromorphic approach / Petrov-Galerkin法 / 有限要素法 / 高次ひずみ勾配理論 / 安定化有限要素 / き裂
Outline of Research at the Start

破壊の初期と最終段階にシームレスに移行するために、中間段階における変位の不連続性が遷移する過程を表現可能な数値解析手法を提案する。さらに、破壊力学に基づく数理モデルを用いてすべての段階を扱うことで、各段階の移行時に無用な近似を排除して、初期段階で生じた疲労損傷が最終段階のき裂進展に及ぼす影響を力学的に首尾一貫して評価可能な手法を構築する。

Outline of Final Research Achievements

The objective of this study is to propose a numerical method that represents the transition process of discontinuity of displacement field in the middle stage of fracture for an end goal that realize seamlessly the transition from from the initial stage to the final stage. With the end of goal in mind, a numerical method in which the whole stages are represented by the same mathematical model based on the fracture mechanics is developed to coherently evaluate the effect of fatigue damage at the initial stage on the crack propagation at the final stage without any approximation method.

Academic Significance and Societal Importance of the Research Achievements

本研究では、破壊の初期段階から最終段階へシームレスに移行するために、中間段階における変位場の不連続性が遷移する過程を表現可能なPetrov-Galerkin法およびMicromorphic approachに基づく非局所アプローチを提案した。双方の手法ともに埋込型損傷構成則の枠組みで定式化を行うことで、破壊の初期段階から最終段階までを力学的に首尾一貫して評価可能となった。さらに、有限被覆法と組み合わせることで、破壊の初期段階から最終段階へシームレスに移行可能な数値解析手法を構築した。

Report

(3 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Research-status Report
  • Research Products

    (20 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (16 results)

  • [Journal Article] An implicit solution for an elastic-plastic model with hardening rule depending on plastic strain range using a primal-dual interior point method2022

    • Author(s)
      新宅 勇一、中村 文俊、堤 成一郎、寺田 賢二郎
    • Journal Title

      Transactions of the Japan Society for Computational Engineering and Science

      Volume: 2022 Issue: 0 Pages: 20220001-20220001

    • DOI

      10.11421/jsces.2022.20220001

    • NAID

      130008145203

    • ISSN
      1344-9443, 1347-8826
    • Year and Date
      2022-01-27
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A CDM-like constitutive law for predicting degradation of strength and ductility of steel subjected to cyclic loading2022

    • Author(s)
      Shintaku Yuichi、Tsutsumi Seiichiro、Terada Kenjiro
    • Journal Title

      International Journal of Plasticity

      Volume: 153 Pages: 103237-103237

    • DOI

      10.1016/j.ijplas.2022.103237

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Numerical material testing based on homogenization method for non-periodic media (Formulation using microscopic fluctuation displacement and macroscopic strain)2022

    • Author(s)
      SHINTAKU Yuichi、IMAI Daiki、TERADA Kenjiro
    • Journal Title

      Transactions of the JSME (in Japanese)

      Volume: 88 Issue: 909 Pages: 22-00049-22-00049

    • DOI

      10.1299/transjsme.22-00049

    • ISSN
      2187-9761
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cohesive-traction embedded damage-like constitutive law based on non-local approach and its numerical implementation improved by Petrov-Galerkin method2021

    • Author(s)
      金澤 凌平、新宅 勇一、寺田 賢二郎
    • Journal Title

      Transactions of the Japan Society for Computational Engineering and Science

      Volume: 2021 Issue: 0 Pages: 20210008-20210008

    • DOI

      10.11421/jsces.2021.20210008

    • NAID

      130008028635

    • ISSN
      1347-8826
    • Year and Date
      2021-04-22
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 超弾性モデルに基づく結合力埋込型弾塑性損傷構成則によるボイドおよび破壊靭性値に関する不確実性評価2021

    • Author(s)
      稲岡龍彦, 新宅勇一
    • Organizer
      日本機械学会第34回計算力学講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] き裂面の連続性を考慮した結合力埋込型損傷構成則を 用いた非局所アプローチ2021

    • Author(s)
      榎本亘, 新宅勇一
    • Organizer
      日本機械学会第34回計算力学講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] A new homogenization scheme based on energy and kinematic preservation: application for predicting dispersion of macroscopic material strength on ferrite-perlite steel2021

    • Author(s)
      D. Imai, Y. Shintaku, K. Terada
    • Organizer
      XVI International Conference on Computational Plasticity
    • Related Report
      2021 Annual Research Report
  • [Presentation] Prediction of fracture toughness at steel bridge after cyclic loading by a CDM-like constitutive law combined with cohesive zone model and memory surface2021

    • Author(s)
      F. Nakamura, Y. Shintaku, K. Terada
    • Organizer
      XVI International Conference on Computational Plasticity
    • Related Report
      2021 Annual Research Report
  • [Presentation] 金属材料の脆性破壊に対する強度のばらつき評価に向けた非周期性を許容する均質化法の提案,2021

    • Author(s)
      今井大貴, 新宅勇一
    • Organizer
      第29回茨城講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 塑性誘起損傷および塑性ひずみ振幅依存性を考慮した結合力埋込型弾塑性モデルによる地震動を受けた鋼橋の残存耐荷力評価2021

    • Author(s)
      中村文俊, 新宅 勇一
    • Organizer
      第29回茨城講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 確率論的選点法を用いた延性脆性遷移領域における破壊靭性値のばらつき評価2021

    • Author(s)
      稲岡龍彦, 新宅勇一
    • Organizer
      第26回計算工学講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 塑性解析における計算時間の短縮を目的とした有限要素法の検討2021

    • Author(s)
      榎本亘, 新宅勇一
    • Organizer
      第26回計算工学講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Memory surfaceによる硬化の影響を考慮した材料モデルに対する主双対内点法の適用2020

    • Author(s)
      中村文俊、新宅勇一
    • Organizer
      第25回計算工学講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 数値材料試験を用いたへき開破壊に起因する材料強度のばらつき評価2020

    • Author(s)
      今井大貴、新宅勇一
    • Organizer
      第25回計算工学講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] き裂進展解析に対する損傷の非局所性の影響に関する数値解析的 検討2020

    • Author(s)
      金澤凌平、新宅勇一
    • Organizer
      日本機械学会 2020年茨城講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] フェライト-パーライト鋼における結晶すべりおよびへき開破 壊を考慮した数値材料試験2020

    • Author(s)
      今井大貴、新宅勇一
    • Organizer
      日本機械学会 2020年茨城講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] Memory surface を考慮した弾塑性モデルによる地震時の鋼橋の数 値解析2020

    • Author(s)
      中村文俊、新宅勇一
    • Organizer
      日本機械学会 2020年茨城講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] 主双対内点法を用いた非線形材料モデルのパラメータ同定2020

    • Author(s)
      神田寛明、新宅勇一
    • Organizer
      日本機械学会 2020年茨城講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] Assessment of residual strength and toughness of steel bridge by a cohesive-force embedding constitutive law combined with plasticity-induced damage and memory surface2020

    • Author(s)
      F. Nakamura, Y. Shintaku, S. Tsutsumi and K. Terada
    • Organizer
      COMPSAFE2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Multiscale prediction of macroscopic material strength dispersion on ferrite - pearlite steel by numerical material testing2020

    • Author(s)
      D. Imai, Y. Shintaku, K. Terada
    • Organizer
      COMPSAFE2020
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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