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  • 标题:溶接によりき裂部近傍がうける熱ひずみ履歴と残留応力・残留ひずみ
  • 本地全文:下载
  • 作者:佐藤 邦彦 ; 豊田 政男 ; 寺崎 俊夫
  • 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:1976
  • 卷号:1976
  • 期号:139
  • 页码:284-291
  • DOI:10.2534/jjasnaoe1968.1976.284
  • 出版社:The Japan Society of Naval Architects and Ocean Engineers
  • 摘要:

    In the welded joint having a pre-existing defect, the crack tip is subjected to thermal-strain and stress cycles by successive welding. Hot straining embrittlement and residual stress due to successive welding will influence the brittle fracture initiation of weldment. Two-dimensional finite element method analyse are carried out for obtaining thermal stress-strain cycles during welding and distribution of residual stresses-strains near the tip of a pre-existing crack. Appreciable difference in residual stress distribution is not observed between Before-Weld-Notch (BWN) and After-Weld-Notch (AWN) specimens. Much difference in the residual equivalent plastic strain is observed between BWN and AWN specimen. In BWN-specimen, there is a large concentration of plastic strain near crack tip during welding. This hot-straining causes considerable decrease in fracture toughness. In the welded joint of steel, the residual stress-strain distributions near crack tip is decided by the parameter T CmaxY0 , where T Cmax is the maximum heating temperature at the crack tip and σ Y0 is the yield stress of materials at room temperature. The conventional formulae on residual stress distribution and residual equivalent plastic strain in the vicinity of a pre-existing crack are shown using the parameter T CmaxY0 .

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