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

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03769
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: University 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
• Keywords: 座屈 / FEM / 薄肉部材 / 極限荷重

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.

Free Research Field

材料力学

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．