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Evaluation of the Upper Shelf Energy for Ferritic Steels from Miniaturized Charpy Specimen Data

Kurishita, H
Associate professor, research associate and professor,Institute for Materials Research, Tohoku University,Ibaraki-ken,

Shibahara, I
Manager and research scientist,Oarai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation,Ibaraki-ken,

Narui, M
Associate professor, research associate and professor,Institute for Materials Research, Tohoku University,Ibaraki-ken,

Mizuta, S
Manager and research scientist,Oarai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation,Ibaraki-ken,

Kayano, H
Associate professor, research associate and professor,Institute for Materials Research, Tohoku University,Ibaraki-ken,


Pages: 15    Published: Jan 1996


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Source: STP1270-EB


Abstract

In order to develop the methodology to evaluate the upper shelf energy (USE) for full size Charpy specimens of ferritic steels from miniaturized specimen data, the effects of specimen size and notch dimensions (notch root radius and notch depth) on the USE were studied for high strength ferritic steels with relatively low USE values of 135 and 107 J. The USE for miniaturized specimens, normalized by Bb 2 or (Bb)3/2 (B is the specimen thickness, b is the ligament size), was essentially independent of specimen size and tended to decrease with increasing the elastic stress concentration factor, Kt, but the Kt dependence was not significant. The normalized USE for full size specimens was considerably lower than that for miniaturized specimens. A general relationship was found that allows to determine the USE of full size specimens of ferritic steels directly from miniaturized specimen data.


Keywords:
small specimen technology, Charpy impact test, notch root radius, notch depth, USE, elastic stress concentration factor, miniaturized specimen, full size specimen

Paper ID: STP16508S
Committee/Subcommittee: E10.08
DOI: 10.1520/STP16508S
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