Dynamic J-R tests for Leak-Before-Break (LBB) design, when rapid loading is applied, have traditionally been performed using Direct Current Potential Drop (DCPD) as the measuring method of crack extension length. However, for ferritic steel, it is difficult to determine the crack initiation point due to the pulse drop from the ferromagnetic phenomenon at the initial stage of the test. Recently, a normalization method using only load and load line displacement curves was proposed and used as a standard dynamic J-R test procedure in ASTM E1820. To compare dynamic J-R curves obtained by the two different test methods, tested results using DCPD was reanalyzed in accordance with the normalization method. In the normalization method, physical crack extension length is restricted to the lesser of 4mm or 15% of the initial uncracked ligament to minimize curve-fitting errors. However, in some of the DCPD data, the results for the specimen contained physical crack lengths that propagated beyond 4mm. Actually, without ductility information for the tested materials, the possibility of violating the physical crack extension restriction for normalization for a first test specimen is high. This paper evaluates the effect of physical crack extension length on the reliability of dynamic J-R properties for LBB design of reactor coolant piping materials for Korean Standard Nuclear Power Plants. The J-R properties between dynamic and static loading are also compared.
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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:
0-7918-4284-3
PROCEEDINGS PAPER
Static and Dynamic J-R Tests for LBB Design Application of Ferritic Piping Materials
Kuk Cheol Kim,
Kuk Cheol Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
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Jin Ik Suk,
Jin Ik Suk
Doosan Heavy Industries & Construction Company, Ltd., Daejeon, South Korea
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Un Hak Sung,
Un Hak Sung
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
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Byoung Koo Kim,
Byoung Koo Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
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Jeong Tae Kim
Jeong Tae Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
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Kuk Cheol Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
Jin Ik Suk
Doosan Heavy Industries & Construction Company, Ltd., Daejeon, South Korea
Un Hak Sung
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
Byoung Koo Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
Jeong Tae Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, South Korea
Paper No:
PVP2007-26505, pp. 103-109; 7 pages
Published Online:
August 20, 2009
Citation
Kim, KC, Suk, JI, Sung, UH, Kim, BK, & Kim, JT. "Static and Dynamic J-R Tests for LBB Design Application of Ferritic Piping Materials." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication. San Antonio, Texas, USA. July 22–26, 2007. pp. 103-109. ASME. https://doi.org/10.1115/PVP2007-26505
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