Fracture toughness measurements with subsize disk compact specimens
Special fixtures and test methods have been developed for testing small disk compact specimens (12.5 mm diam by 4.6 mm thick). Both unloading compliance and potential drop methods have been used to monitor crack extension during the J-integral resistance (J-R) curve testing. Provisions have been made to allow the necessary probes and instrumentation to be installed remotely using manipulators for testing of irradiated specimens in a hat cell. Laboratory trials showed that both unloading compliance and potential drop gave useful results. Both techniques gave similar data, and predicted the final crack extension within allowable limits. The results from the small disk compact specimens were similar to results from conventional compact specimens 12.7-mm thick. However, the slopes of the J-R curves from the larger specimens were lower, suggesting that the smaller disk compact specimens may have lost some constraint due to their size. The testing shows that it should be possible to generate useful J-R curve fracture toughness data from the small disk compact specimens.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7027758
- Report Number(s):
- CONF-920146-6; ON: DE93001374
- Resource Relation:
- Conference: ASTM international symposium on small specimen test techniques and their applications to nuclear reactor vessel thermal annealing and plant life extension, New Orleans, LA (United States), 29-31 Jan 1992
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
AUSTENITIC STEELS
MECHANICAL TESTS
THERMONUCLEAR REACTOR MATERIALS
PHYSICAL RADIATION EFFECTS
FIRST WALL
FRACTURE PROPERTIES
ITER TOKAMAK
MATERIALS TESTING
ALLOYS
CLOSED PLASMA DEVICES
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
RADIATION EFFECTS
STEELS
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THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
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700480* - Fusion Technology- Component Development
Materials Studies- (1992-)
360103 - Metals & Alloys- Mechanical Properties
360106 - Metals & Alloys- Radiation Effects