For Leak-Before-Break (LBB) analysis of nuclear piping, a circumferential through-wall crack (TWC) with the crack front parallel to the cylinder radius is typically postulated, i.e., an idealized TWC. Such assumption simplifies the LBB analysis significantly. However, in reality, an internal surface crack grows through the wall thickness and penetrates through the wall thickness at the deepest point. Hence, a TWC with different crack lengths at inner and outer surfaces is formed. Such a TWC is referred to as a “slanted TWC” in the present study. Leak rates as well as SCC and fatigue crack growth rates of slanted TWC are expected to be quite different from those of postulated idealized TWC. In this context, characterization of the actual TWC shape during crack growth due to fatigue or stress corrosion cracking is essential for accurate LBB analysis. Based on detailed 3-dimensional (3-D) elastic finite element (FE) analyses, the present paper provides stress intensity factors (SIFs) for plates and cylinders with slanted TWCs. As for loading conditions, axial tension was considered for the plates, whereas axial tension and global bending were considered for the cylinders. In order to cover the practical range of crack sizes, the geometric variables affecting the SIF were systematically varied. Based on FE analysis results, SIFs along the crack front, including the inner and outer surface points, were provided. The SIFs of slanted TWC can be used to evaluate the fatigue crack growth of a TWC and to perform detailed LBB analysis considering a more realistic crack shape.
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ASME 2007 Pressure Vessels and Piping Conference
July 22–26, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4279-7
PROCEEDINGS PAPER
Stress Intensity Factors of Slanted Through-Wall Cracks in Plate and Cylinder Available to Purchase
Nam-Su Huh,
Nam-Su Huh
Korea Atomic Energy Research Institute, Daejeon, South Korea
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Do-Jun Shim,
Do-Jun Shim
Engineering Mechanics Corporation of Columbus, Columbus, OH
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Ji-Ho Kim,
Ji-Ho Kim
Korea Atomic Energy Research Institute, Daejeon, South Korea
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Gery M. Wilkowski,
Gery M. Wilkowski
Engineering Mechanics Corporation of Columbus, Columbus, OH
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Jun-Seok Yang
Jun-Seok Yang
Korea Electric Power Research Institute, Daejeon, South Korea
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Nam-Su Huh
Korea Atomic Energy Research Institute, Daejeon, South Korea
Do-Jun Shim
Engineering Mechanics Corporation of Columbus, Columbus, OH
Ji-Ho Kim
Korea Atomic Energy Research Institute, Daejeon, South Korea
Gery M. Wilkowski
Engineering Mechanics Corporation of Columbus, Columbus, OH
Jun-Seok Yang
Korea Electric Power Research Institute, Daejeon, South Korea
Paper No:
PVP2007-26209, pp. 619-625; 7 pages
Published Online:
August 20, 2009
Citation
Huh, N, Shim, D, Kim, J, Wilkowski, GM, & Yang, J. "Stress Intensity Factors of Slanted Through-Wall Cracks in Plate and Cylinder." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 1: Codes and Standards. San Antonio, Texas, USA. July 22–26, 2007. pp. 619-625. ASME. https://doi.org/10.1115/PVP2007-26209
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