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http://dx.doi.org/10.3795/KSME-A.2004.28.4.352

Prediction of Failure Behavior for Nuclear Piping Using Curved Wide-Plate Test  

Huh, Nam-Su (성균관대학교 기계공학부)
Kim, Yun-Jae (고려대학교 기계공학과)
Choi, Jae-Boong (성균관대학교 기계공학부)
Kim, Young-Jin (성균관대학교 기계공학부)
Lim, Hyuk-Soon (한국수력원자력㈜ 원자력환경기술원)
Chung, Dae-Yul (한국수력원자력㈜ 원자력환경기술원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.28, no.4, 2004 , pp. 352-361 More about this Journal
Abstract
One important element of the Leak-Before-Break analysis of nuclear piping is how to determine relevant fracture toughness (or the J-resistance curve) for nonlinear fracture mechanics analysis. The practice to use fracture toughness from a standard C(T) specimen is known to often give conservative estimates of toughness. To improve the accuracy, this paper proposes a new method to determine fracture toughness using a nonstandard testing specimen, curved wide-plate in tension. To show validity of the proposed curved wide-plate test, the J-resistance curve from the full-scale pipe test is compared with that from the curved wide-plate test and that from the C(T) specimen. It is shown that the J-resistance curve form the curved wide-plate tension test is similar to, but that from the C(T) specimen is lower than, the J-resistance curve from the full-scale pipe test. Further validation is performed by investigating crack-tip constraint conditions via detailed 3-D FE analyses, which shows that the crack-tip constraint condition in the curved wide-plate tension specimen is indeed similar to that in the full-scale pipe under bending.
Keywords
Constraint Effect; Curved Wide-Plate Test; Full-Scale; Pipe Test; J-R Curve; Leak-Before-Break;
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