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  • 标题:浅いV切欠きをもつ大型構造要素の脆性破壊強度評価へのローカルアプローチの適用 破壊制御設計へのローカルアプローチの展開 (第5報)
  • 本地全文:下载
  • 作者:南 二三吉 ; 大畑 充 ; 長尾 亮
  • 期刊名称:日本造船学会論文集
  • 印刷版ISSN:0514-8499
  • 电子版ISSN:1884-2070
  • 出版年度:1999
  • 卷号:1999
  • 期号:186
  • 页码:465-473
  • DOI:10.2534/jjasnaoe1968.1999.186_465
  • 出版社:The Japan Society of Naval Architects and Ocean Engineers
  • 摘要:

    This paper employs the Local Approach for the evaluation of the fracture performance of a large structural component. The material used is a high strength steel of 490MPa class for steel-framed structures. Hollow-section beam specimens are constructed, where shallow V-notches are introduced at the edge of the flange. Conventional fracture mechanics procedures can not be directly applied to the notched component, because they have a basis on a crack or a crack-like defect. Three-dimensional FE-analysis demonstrates that the shallow V-notched component holds a considerably relaxed stress field compared to the fracture toughness specimen with a deep crack. This is due to a large difference in the near crack/notch tip constraint between the component and toughness specimen. This study insists that the Weibull stress, an integrated stress over the fracture process zone, is a measure of the fracture driving force of both notched and cracked specimens. The fracture load and fracture strain for the hollow-section beam with shallow V-notches can be predicted from the fracture toughness test results based on the Weibull stress criterion ; the critical Weibull stress at brittle fracture initiation is a material property regardless of the type of a notch/crack.

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