Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 84, Issue 8, Pages 512-525Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2007.03.002
Keywords
API X65 steel; ductile fracture; finite element (FE) analysis; gouge; local fracture strain criterion
Funding
- National Research Foundation of Korea [2005-04716, 과C6A1802] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A local failure criterion for API X65 steel is applied to predict ductile failure of full-scale API X65 pipes with simulated corrosion and gouge defects under internal pressure. The local failure criterion is the stress-modified fracture strain as a function of the stress triaxiality (defined by the ratio of the hydrostatic stress to the effective stress). Based on detailed finite element (FE) analyses with the proposed local failure criterion, burst pressures of defective pipes are estimated and compared with experimental data. For pipes with simulated corrosion defects, FE analysis with the proposed local fracture criterion indicates that predicted failure takes place after the defective pipes attain maximum loads for all cases, possibly due to the fact that the material has sufficient ductility. For pipes with simulated gouge defects, on the other hand, it is found that predicted failure takes place before global instability, and the predicted burst pressures are in good agreement with experimental data, providing confidence in the present approach. (c) 2007 Elsevier Ltd. All rights reserved.
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