周方向表面欠陥を有するパイプの延性破壊に及ぼす内圧の影響

DOI Web Site 参考文献11件

書誌事項

タイトル別名
  • The Influence of Internal Pressure on Ductile Fracture from a Circumferential Surface Defect on a Pipe
  • シュウ ホウコウ ヒョウメン ケッカン オ ユウスル パイプ ノ エンセイ ハカイ ニ オヨボス ナイアツ ノ エイキョウ

この論文をさがす

抄録

In recent years, construction of natural gas pipelines is expanding to severe environmental area such as seismic or permafrost region. In these regions, it can be expected that pipelines will be subjected to large deformation due to large ground movement associated with liquefaction in seismic region or frost heave in permafrost. In that case, it is focused on ductile fracture from circumferential flaw as a main failure mode. However, it has not been fully understood ductile fracture behavior under biaxial loading such as hoop stress from internal pressure and longitudinal stress.<br>This paper presents the influence of internal pressure on ductile fracture conducting full-scale pipe tests on machined surface notches with⁄without internal pressure. Especially, it is focused on investigation of ductile tearing from circumferential surface defect. Ductile tearing resistance curves (R-curves) obtain from pressurized and un-pressurized pipe tests show a good agreement. On the other hand, internal pressure increases the notch tip opening displacement of a circumferential surface defect at equal levels of applied longitudinal strain because a pressurized pipe is constrained in circumferential direction by internal pressure. These results indicate that high internal pressure decreases the longitudinal strain at ductile crack initiation or penetration from a circumferential surface defect.

収録刊行物

  • 圧力技術

    圧力技術 49 (4), 157-164, 2011

    一般社団法人 日本高圧力技術協会

参考文献 (11)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ