• Title/Summary/Keyword: 인바, 36%니켈강

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A Study on the Fatigue Strength of the Welds of Membrane Type LNG Tank (멤브레인 방식 LNG탱크 용접부의 피로강도에 관한 연구)

  • 김종호
    • Journal of Advanced Marine Engineering and Technology
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    • v.21 no.5
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    • pp.542-548
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    • 1997
  • In this study an evaluation method of fatigue strength of membrane type LNG tank is presented with FEM analysis and experimental approach of seam and raised edge welds. The study contains the following : l)FEM analysis of test specimens 2)Fatigue tests of seam and raised edge welds 3)Estimation of cumulative damage factor of the welds on the basis of safe life design concept complying with the rules of classification society 4)Review of the effect of mean stress on the fatigue strength 5)Modelling of fatigue life of the welds which is changeable by weld heights With the results obtained in this study, a model ${\Delta}{\delta}/h^2=0.13553\;{N_{f}}^{-0.3151}$ for seam and raised edge welds having a given weld height is proposed to be useful for designers and inspectors.

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