Experimental and analytical assessment of circumferential through-wall cracked pipes under pure bending
This study was performed to assess the validity of various techniques to predict crack initiation loads and maximum loads for circumferentially through-wall-cracked pipes under pure bending. Experimental data were developed for both carbon steel and stainless steel pipes. Predictions of crack initiation and maximum loads were made using the net-section-collapse method, three different J-estimation schemes, and the British R6 method. The net-section-collapse method gave good maximum-load predictions for certain types of pipe; however, for large diameter and/or low toughness pipe this analysis method tended to overpredict the experimental maximum load. A plastic-zone screening criterion was developed to show when this method was valid and when elastic-plastic fracture mechanics should be used. In the J-estimation scheme analyses, sensitivity studies were conducted to assess the fit of the Ramberg-Osgood coefficients, as well as the use of deformation J and modified J (J/sub M/) crack growth resistance curves. The results showed that the GE/EPRI estimation scheme underpredicted the experimental loads by the greatest amount. The LBB.NRC and Paris methods gave more accurate predictions. The GE/EPRI method was also found to be more sensitive to the fit of the stress-strain curve than the LBB.NRC method. The R6 method underpredicted the failure loads for all cases. For maximum load predictions, the GE/EPRI method still underpredicted the experimental load when the J/sub M/ resistance curve was used. The other methods occasionally overpredicted the maximum load using J/sub M/-resistance curve.
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- OSTI ID:
- 5089366
- Report Number(s):
- NUREG/CR-4574; BMI-2136; ON: TI87900003
- Country of Publication:
- United States
- Language:
- English
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360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
BENDING
CARBON STEELS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
CRACKS
FRACTURE MECHANICS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICS
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
PIPES
POWER PLANTS
REACTOR MATERIALS
STAINLESS STEELS
STEELS
THERMAL POWER PLANTS
US NRC
US ORGANIZATIONS