Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Load Bearing Capacity of Welded Joints between Dissimilar Pipelines with Unequal Wall Thickness

두께가 다른 이종배관 용접부 면삭 각도 변화에 따른 하중지지능력 평가

  • 백종현 (한국가스공사 연구개발원) ;
  • 김영표 (한국가스공사 연구개발원) ;
  • 김우식 (한국가스공사 연구개발원)
  • Received : 2011.10.07
  • Accepted : 2012.06.25
  • Published : 2012.09.01
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Abstract

The behavior of the load bearing capacity of a pipeline with unequal wall thickness was evaluated using finite element analyses. Pipelines with a wall thickness ratio of 1.22-1.89 were adopted to investigate plastic collapse under tensile, internal pressure, or bending stress. A parametric study showed that the tensile strength and moment of a pipeline with a wall thickness ratio less than 1.5 were not influenced by the wall thickness ratio and taper angle; however, those of a pipeline with a wall thickness ratio more than 1.5 decreased considerably at a low taper angle. The failure pressure of a pipeline with unequal wall thickness was not influenced by the wall thickness ratio and taper angle.

두께가 다른 이종강도 배관 용접부에서 인장, 내압 및 굽힘응력에 대한 하중지지능력을 평가하였다. 1.22, 1.54 및 1.89의 두께비를 갖는 API X65-API X80, API X42-API X65 및 API X42-API X80 배관 용접부를 유한요소해석을 통하여 하중지지능력을 평가하였다. 이종강도 배관의 두께비가 1.5 이하에서 인장강도와 최대모멘트는 면삭각도 변화에 큰 영향을 받지 않으나 두께비가 1.5 이상에서는 큰 영향을 받는다. 저강도 배관의 길이방향 면삭각도와 두께비 변화에 따라서는 내압에 의한 파열압력은 영향을 받지 않는다.

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References

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