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

  • 제34권9호
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  • Pages.1293-1298
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  • 2010
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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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감육엘보 실증실험에서의 탄성 및 소성 한계하중 거동 고찰

Behavior of Elastic and Plastic Limit Loads of Thinned Elbows Observed During Real-Scale Failure Test Under Combined Load

  • 이성호 (한전전력연구원 원자력발전연구소) ;
  • 이정근 (한전전력연구원 원자력발전연구소) ;
  • 박치용 (한전전력연구원 원자력발전연구소)
  • 투고 : 2010.06.04
  • 심사 : 2010.06.28
  • 발행 : 2010.09.01
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초록

본 연구에서는 인공감육엘보에 대해 내압 및 굽힘의 복합하중을 작용시킨 실 배관 실증실험으로부터 생성한 회전각 대비 모멘트 곡선으로부터 감육결함 엘보에서 소성변형이 시작되는 1 배탄성구배법에 기초한 OES 탄성하중과 2 배탄성구배법에 기초한 TES 소성하중의 거동 및 상관관계를 살펴보았다. ASME 에서도 제시하고 있는 TES 소성하중은 균열손상에 따른 배관계통 구조 건전성 상실을 배제하면서도 지속사용을 허용할 수 있는 대체 관리 기준으로서 적합한 것으로 판단된다.

In most power plants, wall thinning in carbon-steel pipes due to flow-accelerated corrosion is one of the major aging phenomena, and it reduces the load-carrying capacity of the piping system. Various types of wall-thinning defects were manufactured in real-scale elbows, and monotonic in-plane bending tests were performed under internal pressure to evaluate the failure behavior of the elbows. In this paper, the behavior of elastic and plastic limit leads of locally thinned elbows in a real-scale failure test is presented. The loads determined on the basis of TES (twice elastic slope) were considered to be the limit loads of locally thinned elbows so that the integrity of the thinned elbows could be maintained, even when a small amount of plastic deformation might have occurred.

키워드

참고문헌

  1. Chexal, B., Horowitz, J., Dooly, B., Millett, P., Wood, C. and Jones, R., 1998, "Flow Accelerated Corrosion in Power Plant," EPRI TR-106611-R2.
  2. WANO, 2006, "Flow Accelerated Corrosion," Significant Event Report 2006-1.
  3. INPO, 2006, "Flow Accelerated Corrosion," Engineering Program Guideline.
  4. Kiefner, J. F. and Vieth, P. H., 1990, "New Method Corrects Criterion for Evaluating Corroded Pipe," Oil & Gas J., Vol. 32, pp. 56-59.
  5. Deardorff, A. F. and Bush, S. H, 1990, "Development of ASME section XI criteria for erosion-corrosion thinning of carbon steel piping," PVP-Vol-186, NDEVol. 7, pp. 71-75.
  6. Lee, S. H, Park, C. Y. and Park, J. H., 2009, "Investigation of the Performance Based Structural Safety Factor of Elbows in Nuclear Power Plant," Trans. of KSME (A), Vol. 33, No. 8, pp. 826- 831. https://doi.org/10.3795/KSME-A.2009.33.8.826
  7. Lee, S. H., Lee, J. K. and Park. J. H., 2007, "Failure Behavior of Thinned Elbows According to Circumferential Thinning Width and Position under Internal Pressure and In-Plane Bending", Trans. of the KPVP, Vol. 3, No. 1, pp. 74-80.