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Use of instrumented Charpy tests to determine onset of upper-shelf energy

Journal Article · · Weld. Res. (Miami); (United States)
OSTI ID:6902771
;
Identifying the onset of C/sub v/ upper-shelf toughness is of paramount importance to the continued integrity of a pressure vessel. Most in-service surveillance programs require that the C/sub v/ upper-shelf toughness be determined. This is particularly true for the surveillance programs for nuclear pressure vessels. In the nuclear systems the change in C/sub v/ upper-shelf energy due to irradiation must frequently be determined with a limited number of surveillance specimens. Currently, fracture appearance is the criterion used to assure that the tests are being conducted in the C/sub v/ upper-shelf temperature range. This procedure is satisfactory when a number of specimens are available and accessible for interpretation. This is not always the case; irradiated specimens must be remotely tested and interpreted. Examining a specimen remotely may result in an erroneous interpretation of the fracture surface. To avoid this possibility we have developed a procedure, using an instrumented Charpy impact tester, that by linear extrapolation can identify the onset of the C/sub v/ upper-shelf toughness regime with as few as two specimens. This paper discusses the development of the procedure and its application.
Research Organization:
Oak Ridge National Lab., TN
OSTI ID:
6902771
Journal Information:
Weld. Res. (Miami); (United States), Journal Name: Weld. Res. (Miami); (United States); ISSN WERSA
Country of Publication:
United States
Language:
English

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200 -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHARPY TEST
CHEMICAL COMPOSITION
CONTAINERS
DATA
DESTRUCTIVE TESTING
DUCTILITY
EXPERIMENTAL DATA
FAILURES
FRACTURES
HIGH TEMPERATURE
IMPACT TESTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
MECHANICAL TESTS
MEDIUM TEMPERATURE
NUMERICAL DATA
PRESSURE VESSELS
STEEL-ASTM-A212
STEEL-ASTM-A387
STEELS
TENSILE PROPERTIES
TESTING