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http://dx.doi.org/10.3795/KSME-A.2009.33.4.409

Analysis of Cleavage Fracture Toughness of PCVN Specimens Based on a Scaling Model  

Park, Sang-Yun (한국원자력연구원)
Lee, Ho-Jin (한국원자력연구원)
Lee, Bong-Sang (한국원자력연구원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.33, no.4, 2009 , pp. 409-416 More about this Journal
Abstract
Standard procedures for a fracture toughness testing require very severe restrictions for the specimen geometry to eliminate a size effect on the measured properties. Therefore, the used standard fracture toughness data results in the integrity assessment being irrationally conservative. However, a realistic fracture in general structures, such as in nuclear power plants, may develop under the low constraint condition of a large scale yielding with a shallow surface crack. In this paper, cleavage fracture toughness tests have been made on side-grooved PCVN (precracked charpy V-notch) type specimens (10 by 10 by 55 mm) with various crack depths. The constraint effects on the crack depth ratios were evaluated quantitatively by the developed scaling method using the 3-D finite element method. After the fracture toughness correction from scaling model, the statistical size effects were also corrected according to the standard ASTM E 1921 procedure. The results were evaluated through a comparison with the $T_0$ of the standard CT specimen. The corrected $T_0$ for all of the PCVN specimens showed a good agreement to within $5.4^{\circ}C$ regardless of the crack depth, while the averaged PCVN $T_0$ was $13.4^{\circ}C$ higher than the real CT test results.
Keywords
Shallow Crack; Fracture Toughness Testing; Constraint Effects; 3-Dimensional Crack; Scaling Model;
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