減肉を有する炭素鋼配管の繰返し変形特性評価

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書誌事項

タイトル別名
  • Cyclic Deformation Characteristics of Carbon Steel Pipe with Local Thin Area
  • 減肉を有する炭素鋼配管の繰返し変形特性評価 : 内圧負荷の影響
  • ゲンニク オ ユウスル タンソコウ ハイカン ノ クリカエシ ヘンケイ トクセイ ヒョウカ : ナイアツ フカ ノ エイキョウ
  • -内圧負荷の影響-
  • - Effect of Internal Pressure -

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抄録

Fitness-For-Service (FFS) assessment is a quantitative engineering approach that is used to determine the equipment with a flaw or damage is fit to continue operation. It can be used to make run-repair-replace decisions to help determine if pressured equipment containing flaw can continue to operate safety for some desired future period. <br>This paper provides a FFS assessment method on carbon steel pipe which contained a LTA (Local Thin Area) against seismic load and internal pressure load by FEM (Finite Element Method) analysis. Abaqus Ver. 6. 14, which provides the combined isotropic⁄kinematic hardening model, is used to simulate the LTA contained carbon steel pipe against seismic load and internal pressure load. Material parameters in the hardening model are identified by a symmetric strain cycle experiment based on ASTM E606. Isotropic hardening component is introduced by specifying the equivalent stress defining the size of the yield surface, as a tabular function of the equivalent plastic strain. Kinematic hardening component is obtained from the stabilized cycle of a specimen that is subjected to symmetric stain cycles. <br>The authors calculated up to 100 cycles on carbon steel pipe which contained a Local Thin Area against seismic load and internal pressure at room temperature. The results comparison between FEM analysis and experiment shows that delta-strain for one cycle and number of cycles to failure is predicted accurately. Safety margin of ratcheting assessment also was discussed in this paper.

収録刊行物

  • 圧力技術

    圧力技術 53 (3), 112-119, 2015

    一般社団法人 日本高圧力技術協会

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