One important element of the Leak-Before-Break analysis of nuclear piping is how to determine relevant fracture toughness (or the -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 of predicting piping failure, 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 -resistance curve from the full-scale pipe test is compared with that from the curved wide-plate test and that from C(T) specimen. It is shown that the -resistance curve from the curved wide-plate tension test is similar to, but that from the C(T) specimen is lower than, the -resistance curve from the full-scale pipe test. Further validation is performed by investigating crack-tip constraint conditions via detailed three-dimensional finite element 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.
Prediction of Failure Behavior for Nuclear Piping Using Curved Wide-Plate Test
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division October 15, 2003; revision received July 21, 2004. Associate Editor: W. L. Cheng.
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Huh, N., Kim, Y., Choi , J., Kim , Y., and Pyo, C. (December 1, 2004). "Prediction of Failure Behavior for Nuclear Piping Using Curved Wide-Plate Test ." ASME. J. Pressure Vessel Technol. November 2004; 126(4): 419–425. https://doi.org/10.1115/1.1806447
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