On the use of side-grooves in estimating J /Ic/ fracture toughness with Charpy-size specimens

Journal Article · Tue Apr 01 04:00:00 EST 1980 · J. Eng. Mater. Technol.; (United States)

DOI:https://doi.org/10.1115/1.3224796· OSTI ID:5554372

Server, W L ^[1]; Wullaert, R A ^[2]

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1. Fracture Control Corp., Goleta, Calif.
2. MIT, Cambridge, Mass.

The problem of obtaining a meaningful value of toughness from small Charpy-size surveillance specimens, tested at temperature corresponding to the upper shelf where ductile fracture predominates, is investigated. Following the procedures of Green and Knott for measurement of crack opening displacements at initiation of ductile fracture, a test procedure is adopted in which small precracked Charpy-size bend specimens are side-grooved to increasing depths and tested to failure under both quasi-static and dynamic loading rates. Values of the J-contour integral at maximum load (J max) for specimens side-grooved in excess of 30% are found to agree, within acceptable limits, with valid initiation J(Ic) fracture toughness values determined independently using multispecimen resistance-curve techniques. Three nuclear pressure vessel materials were evaluated at temperatures between 71 and 177 C, which correspond to upper shelf temperatures. The test procedure described offers a simple, inexpensive, small specimen compromise for estimating the fracture toughness at the onset of ductile fracture from a single Charpy-size bend test piece for both quasi-static and dynamic loading rates. This approach could be readily adopted in nuclear surveillance programs for toughness evaluation of unirradiated and neutron-irradiated pressure vessel steels.

• OSTI ID: 5554372
• Journal Information: J. Eng. Mater. Technol.; (United States), Journal Name: J. Eng. Mater. Technol.; (United States) Vol. 102; ISSN JEMTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
CHARPY TEST
CHROMIUM ALLOYS
CONTAINERS
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
DESTRUCTIVE TESTING
DUCTILITY
DYNAMIC LOADS
FRACTURE PROPERTIES
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
PHYSICAL RADIATION EFFECTS
PRESSURE VESSELS
RADIATION EFFECTS
REACTOR MATERIALS
STAINLESS STEELS
STATIC LOADS
STEELS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
TESTING