Fracture analysis of multiple cracks in the NESC-1 spinning cylinder experiment
- Oak Ridge National Lab., TN (United States)
This paper presents finite-element analyses of the cylinder specimen being used in the international Network for Evaluating Steel Components (NESC) large-scale spinning-cylinder project (NESC-1). The NESC was organized as an international forum to exchange information on procedures for structural integrity assessment, to collaborate on specific projects, and to promote the harmonization of international standards. The objective of the NESC-1 project is to focus on a complete procedure for assessing the structural integrity of aged reactor pressure vessels. Current plans for the testing program call for two large cracks to be installed in the NESC-1 cylinder separated by 90{degree}. Three-dimensional finite-element analyses were carried out to determine: (1) the extent of interaction between multiple cracks in the cylinder; and (2) the predicted effects of using an initial cylinder temperature of 295 C and coolant temperature of 5 C in the experiment. The cylinder was modeled with inner-surface through-clad cracks having a depth of 74 mm and aspect ratio of 2:1. The cylinder specimen was subjected to centrifugal loading followed by a thermal shock and analyzed with a thermo-elastic-plastic material model. The analytical results indicate that the stress-intensity factor changes less than 0.2% between a model with one crack and a model with four cracks evenly spaced around the circumference. Cleavage initiation is likely to be achieved for initial and coolant temperatures of 295 and 5 C, respectively.
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 404302
- Report Number(s):
- CONF-960706-; ISBN 0-7918-1780-6; TRN: 97:000438
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) pressure vessels and piping conference, Montreal (Canada), 21-26 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of Integrity of structures, and fluid systems, hazardous release protection, piping and pipe supports, and pumps and valves. PVP-Volume 333; Chung, H.H. [ed.] [Argonne National Lab., IL (United States)]; Brown, S.J. [ed.] [Quest Engineering Development, Humble, TX (United States)]; Goodling, E.C. Jr. [ed.] [Parsons Power Group, Inc., Reading, PA (United States)]; Ezekoye, L.I. [ed.] [Westinghouse Electric Co., Pittsburgh, PA (United States)]; PB: 267 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fracture analysis of the NESC-1 spinning cylinder experiment
Fracture analysis of the NESC-1 spinning cylinder experiment