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Research of ultimate load mechanism post plastic buckling of thin-walled members

Research Project

Project/Area Number 21K03769
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionUniversity of Toyama

Principal Investigator

Masuda Kenichi  富山大学, 学術研究部工学系, 准教授 (40548153)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords座屈 / FEM / 薄肉部材 / 極限荷重 / 有限要素法 / 塑性座屈 / 有効幅
Outline of Research at the Start

高引張強さ,高加工硬化特性および高伸び率を有する板材を用いた薄肉構造物は,塑性座屈時の荷重がその構造物の極限荷重に対応せず,塑性座屈後も荷重が増加する場合が存在する.本研究では,申請者がこれまで検討してきた弾性座屈後の極限荷重評価法を拡張することで圧縮や曲げを受ける薄肉部材の塑性座屈後の極限荷重の評価法を確立することを目的とする.

Outline of Final Research Achievements

By understanding the characteristics of the critical strain in plate compression and plane bending, it became possible to evaluate the ultimate load corresponding to differences in geometric characteristics, boundary conditions, and material properties.
In the compression and bending of square tubes, it is possible to express the collapse cross-sectional deformation state corresponding to various lengths, widths and heights of the square tube with a single master curve. Therefore, by considering the biaxial stress state caused by the curvature in the longitudinal direction and the local curvature in the cross-sectional direction, it is possible to propose a highly accurate method for evaluating the ultimate load corresponding to the collapse mechanism.

Academic Significance and Societal Importance of the Research Achievements

高伸び率を有する板材の極限荷重は塑性座屈荷重に対応せず,塑性座屈後に生じ,その値は塑性座屈荷重を大きく上回ることが報告されていて,代表的な設計基準として知られているEurocode3では不十分であることが知られている.そのような背景から,Eurocode3の代替方法として連続強度設計法などによる極限荷重の評価法に関する研究が盛んに行われている.しかし,部材崩壊メカニズムの把握,その現象に合わせた合理的な解釈,その解釈に基づく極限荷重の評価は行われていないのが現状である.本研究で得られた合理的な成果は,薄肉部材に対する正しい知識を深化させ得るため,学術的にも社会的にも大きく貢献し得る.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2024 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (1 results)

  • [Journal Article] Effect of surface coating on fatigue life and fatigue crack growth behavior of AISI D2 tool steel2024

    • Author(s)
      K. Masuda, S. Ishihara, H. Shibata, Y. Sakamoto, N. Oguma, M. Iwasaki
    • Journal Title

      International Journal of Fatigue

      Volume: 183 Pages: 108230-108230

    • DOI

      10.1016/j.ijfatigue.2024.108230

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Study on the Fatigue Crack Initiation and Growth Behavior in Bismuth- and Lead-Based Free-Cutting Brasses2022

    • Author(s)
      Kenichi Masuda, Sotomi Ishihara, Noriyasu Oguma, Minoru Ishiguro, Yoshinori Sakamoto and Mami Iwasaki
    • Journal Title

      materials

      Volume: 15 Issue: 21 Pages: 1-20

    • DOI

      10.3390/ma15217488

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Elasto-Plastic Fatigue Crack Growth Behavior of Extruded Mg Alloy with Deformation Anisotropy Due to Stress Ratio Fluctuation2022

    • Author(s)
      Kenichi Masuda, Sotomi Ishihara, Noriyasu Oguma, Minoru Ishiguro and Yoshinori Sakamoto
    • Journal Title

      MDPI materials

      Volume: 15 Issue: 3 Pages: 755-755

    • DOI

      10.3390/ma15030755

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of Rod-like Structure on Fatigue Life, Short Surface Crack Initiation and Growth Characteristics of Extruded Aluminum Alloy A2024 (Analysis via Modified Linear Elastic Fracture Mechanics)2021

    • Author(s)
      Kenichi Masuda, Sotomi Ishihara, Hiroshi Shibata and Noriyasu Oguma
    • Journal Title

      MDPI materials

      Volume: 14 Issue: 24 Pages: 7538-7538

    • DOI

      10.3390/ma14247538

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 軸圧縮を受ける板の崩壊挙動に及ぼす境界条件の影響2021

    • Author(s)
      増田健一
    • Organizer
      日本設計工学会2021年度秋季研究発表講演会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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