INVESTIGADORES
OTEGUI Luis Jose
artículos
Título:
Fatigue assessment of an E.R.W. oil pipeline
Autor/es:
J,L. OTEGUI; CHAPETTI, M.D.; J. MOTYLICKI
Revista:
INTERNATIONAL JOURNAL OF FATIGUE
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2002 vol. 24 p. 21 - 28
ISSN:
0142-1123
Resumen:
A blowout in a 14 in. diameter, 1/4 in. thick API 5L X46 oilpipeline was due to the sudden propagation of a fracture at the longitudinal Electrical Resistance Welding (ERW) weld. The cracks initiated from small hook crack-type defects on the external surface of the tube, in the highly deformed and hardened central area of the ERW weld. Fatigue tests were carried out to characterize initiation and propagation of fatigue cracks in base and weld metals, in two regions of the pipeline. Specimens were subjected to cyclic stresses similar to those that were produced during the passage of the scraper. The fatigue growth was modeled by integrating experimental results. Predicted fatigue lives of about 20,000 cycles justify fatigue propagation up to failure in weld metal, from initial 2 mm deep defects introduced during manufacturing.
