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http://dx.doi.org/10.3795/KSME-A.2015.39.7.729

Effects of Specimen Size and Side-groove on the Results of J-R Fracture Toughness Test for LBB Evaluation  

Kim, Jin Weon (Dept. of Nuclear Engineering, Chosun Univ.)
Choi, Myung Rak (Dept. of Nuclear Engineering, Chosun Univ.)
Oh, Young Jin (Electric Technology Research Institute, KEPCO E&C)
Park, Heung Bae (Electric Technology Research Institute, KEPCO E&C)
Kim, Kyung Su (Electric Technology Research Institute, KEPCO E&C)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.7, 2015 , pp. 729-736 More about this Journal
Abstract
In this study, the effects of specimen size and side-groove on the results of the J-R test for leak-before-break (LBB) evaluation were investigated. A series of J-R tests were conducted at both RT and $316^{\circ}C$, using three different sizes of compact tension (CT) specimens machined from SA508 Gr.1a piping material: 12.7 mm-thick 1T-CT, 25.4 mm-thick 1T-CT, and 25.4 mm-thick 2T-CT with and without side-groove. The results showed that side-grooving reduced the J-R curve for all specimens and the effect of side-grooving was more significant at $316^{\circ}C$ than at RT. As the thickness of the specimens decreased and the width of the specimens increased, the J-R curve slightly decreased at RT but it increased at $316^{\circ}C$. However, the variation in the J-R curve of SA508 Gr.1a with the thickness and width of CT specimen was insignificant.
Keywords
J-R Fracture Toughness Test; Specimen Size; SA508 Gr.1a Piping Material; LBB Evaluation;
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