Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Behavior of Curved Pipes under In-Plane Bending

면내굽힘에서 곡선배관의 거동특성

  • 이상호 (단국대학교 토목환경공학과) ;
  • 송현섭 (단국대학교 토목환경공학과)
  • Published : 2008.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

The pipe elbows subjected to in-plane bending moments are analyzed with the finite element method. The results from the finite element analysis are compared with ASME code equations that are theoretical closed form solutions. The geometric nonlinear effects due to the ovalization are explained with the magnitude and the types of the stresses and the flexibilities of the elbows with the emphasis on the bend angles and elbow factors.

유한요소 해석을 수행하여 엘보우의 거동을 파악하였으며 해석 시 엘보우의 휨 각도와 엘보우계수를 주요변수로 사용하였다. 사용하중은 엘보우 축이 형성하는 평면 내에 작용하는 휨 모멘트를 사용하였으며 해석 결과를 이론적 정해 법으로 유도된 ASME 코드 식과 비교하였다. 또한 엘보우 단면의 응력상태와 유연도 특성을 이용하여 엘보우 단면의 타원변형으로 인한 엘보우의 기하학적 비선형 특성을 설명하였다.

Keywords

References

  1. von T. Karman, "Uber die Formanderung Dunnwandiger Rohre, insbesondere federnder Ausgleichrohre," Zeits V.D.I., Vol. 55,1911, pp1889-1895.
  2. W. Hovgaard, "The Elastic Deformation of Pipe Bends," Journal of Mathematics and Physics, Masschusetts Institute of Technology, Vol. 6, 1926, pp. 69-118.
  3. L. Beskin, "Bending of Curved Thin Tubes, "Journal of Applied Mechanics, Mar. 1945, pp. A-1-A-7.
  4. A. M. Wahl, "Stresses and Reactions in Expansion Pipe Bends, "Pressure Vessel and Piping Design, ASME, 1960, pp. 336-357.
  5. E. C. Rodabaugh and H. H. George, "Effect of Internal Pressure on Flexibility and Stress-Intensification Factors of Curved Pipe or Welding Elbows, "Transactions of the ASME 79,1957, pp. 939-948.
  6. G. Thomson and J. Spence, "Maximum Stresses and Flexibility Factors of Smooth Pipe Bends with Tangent Pipe Terminations under In-Plane Bending, "Journal of Pressure Vessel Technology, Transactions of the ASME, Vol. 105, 1983, pp. 329-336. https://doi.org/10.1115/1.3264289
  7. J. F. Whatham, "Pipe Bend Analysis by Thin Shell Theory, "Journal of Applied Mechanics, Transactions of the ASME, Vol. 53, 1986, pp. 173-180. https://doi.org/10.1115/1.3171707
  8. ASME Boiler and Pressure Vessel Code, Section III "Rules for Construction of Nuclear Power Plant Components" Division I, Subsection NB, Class 1 Components, 2004.
  9. Abaqus, User's Manual, Version 6.7.1, 2007.