Fully plastic h{sub 1}-function solutions for pressurized cylindrical vessels having semi-elliptical surface flaws
Book
·
OSTI ID:122599
- Babcock and Wilcox, Alliance, OH (United States). Research and Development Division
Elastic-plastic fracture mechanics methodology for application to safety analysis of pressurized vessels containing either known or postulate semi-elliptical surface flaws has been developed based on limited finite element solutions which have not necessarily been verified to be accurate. This paper presents results of ABAQUS fully-plastic finite element J-integral solutions in terms of calibration constant h{sub 1} as a function of crack depth to thickness, aspect ratio of the flaw, Ramberg-Osgood hardening exponent, and thickness to inside radius ratio for axially oriented semi-elliptical surface flaws in pressurized cylinders. Finite element meshes for the various flaw depth to wall thickness ratios were generated using a Fortran program (ORMGEN-3D) developed at Oak Ridge National Laboratory. An evaluation of earlier J-integral work lead to the conclusions that the reported J-integral solutions were not taken far enough out in applied pressure to produce valid fully plastic J-integral solutions. In addition to comparisons with these earlier J-integral solutions, the effect of strain hardening was examined. The earlier work was limited to a strain hardening value of n = 8.6. The work presented in this paper includes a wide range of values of n = 5, 7, 8.6, and 10, representative for both austenitic and ferritic pressure vessel and piping steels.
- OSTI ID:
- 122599
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1335-5
- Country of Publication:
- United States
- Language:
- English
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