Assessment of circumferentially complex-cracked pipe subjected to bending
In this study the validity of various analyses to predict crack initiation, maximum load, and the corresponding displacements for 6.625-inch (168-mm) diameter circumferentially complex-cracked pipe under pure bending was assessed. The results of six pipe fracture experiments on three materials (SA-376 TP304 stainless steel, Inconel 600, and A106 Grade B carbon steel) were used to verify the accuracy of these analytical predictions. Three different sets of analyses were conducted. First, the experimental pipe fracture data were compared with net-section-collapse predicted loads. These comparisons showed that some of the complex-cracked pipes failed at loads 23 to 33% below net-section-collapse predicted loads. Second, J-resistance (J-R) curves were calculated from each pipe experiment using the eta-factor method. These results revealed that the J-R curves from the complex-cracked pipe experiments were significantly less than J-R curves from 0.5T compact (tension) specimens. Furthermore, the pipe J-R curves decreased systematically with increasing ratios of surface crack depth to pipe wall thickness. Third, predictions of loads and displacements in each experiment were made using four different J-estimation schemes. Good agreement was obtained between the predictions and the experimental data up to maximum load. Once past maximum load, however, the J-estimation schemes overpredicted loads and displacements.
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- OSTI ID:
- 7242907
- Report Number(s):
- NUREG/CR-4687; BMI-2142; ON: TI87900099
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
220900* -- Nuclear Reactor Technology-- Reactor Safety
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
BENDING
CARBON STEELS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
CRACKS
FRACTURE MECHANICS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 600
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
NATIONAL ORGANIZATIONS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
PIPES
POWER PLANTS
POWER REACTORS
REACTOR MATERIALS
REACTORS
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
THERMAL POWER PLANTS
US NRC
US ORGANIZATIONS