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

  • 제37권4호
  • /
  • Pages.521-527
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  • 2013
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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표면균열이 있는 직관에 대한 선형탄성 응력확대계수 유한요소해석 결과의 요소 및 균열형상 민감도

Element and Crack Geometry Sensitivities of Finite Element Analysis Results of Linear Elastic Stress Intensity Factor for Surface Cracked Straight Pipes

  • 투고 : 2012.09.25
  • 심사 : 2012.12.18
  • 발행 : 2013.04.01
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초록

본 논문에서는 3 차원 유한요소해석을 통해 표면균열이 있는 직관에 내압, 굽힘, 그리고 비틀림의 단일 또는 복합하중이 작용하는 경우의 응력확대계수를 연구하였다. 두 가지 결함평가코드(API-579-1, RCC-MR A16)를 각각 유한요소해석 결과와 비교하여 코드 간의 차이 및 해석의 신뢰성을 확인하였다. 응력확대계수는 적분 경로에 독립적이기 때문에 민감하지 않다고 알려져 있는데 3 차원 유한요소해석을 통해 요소 수에 대한 민감도를 확인하였다. 또한 균열형상의 정의방법에 따른 유한요소해석 결과의 차이와 두 가지 결함평가코드를 사용한 결과의 차이를 확인하였다.

This study provides the elastic stress intensity factors, K, for circumferential and longitudinal surface cracked straight pipes under single or combined loads of internal pressure, bending, and torsion based on three-dimensional (3D) finite element (FE) analyses. FE results are compared with two different types of defect assessment codes (API-579-1 and RCC-MR A16) to prove the accuracy of the FE results and the differences between the codes. Through the 3D FE analysis, it is found that the stress intensity factors are sensitive to the number of elements, which they were believed to not be sensitive to because of path independence. Differences were also found between the FE analysis results for crack defining methods and the results obtained by two different types of defect assessment codes.

키워드

참고문헌

  1. Ainsworth, R. A., 1984, "The Assessment of Defect in Structures of Strain Hardening Material," Engineering Fracture Mechanics, Vol.19, Issue.4, pp.633-642. https://doi.org/10.1016/0013-7944(84)90096-1
  2. API 579-1/ASME FFS-1, 2007, Fitness-for-Service for Pressure Vessels, Piping and Storage Tanks, American Petroleum Institute/American Society of Mechanical Engineers, Washington DC, USA.
  3. Marie, S., Chapuliot, S., Kayser, Y., Lacire, M.H., Drubay, B., Barthelet, B., Le Delliou, P., Rougier, V., Naudin, C., Gilles, P. and Triay, M., 2007, "French RSE-M and RCC-MR Code Appendices for Flaw Analysis: Presentation of the Fracture Parameters Calculation-Part III: Cracked Pipes," International Journal of Pressure Vessels and Piping, Vol.84, Issue.10-11, pp.614-658. https://doi.org/10.1016/j.ijpvp.2007.05.005
  4. Anderson, T. L., 2005, "Fracture Mechanics," Third Edition, Taylor & Francis Group, Florida, pp.103-119.
  5. Kim, Y. J. and Oh, C. S., 2006, "Limit Loads for Pipe Bends Under Combined Pressure and in-Plane Bending Based on Finite Element Limit Analysis," International Journal of Pressure Vessels and Piping, Vol.84, Issue.3, pp. 177-184.
  6. ABAQUS, 2009, ABAQUS Version 6.9 User's Manual, Dassault Systems Inc.