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2010 №05 (01) 2010 №05 (03)

The Paton Welding Journal 2010 #05
TPWJ, 2010, #5, 10-14 pages
 
IMPROVEMENT OF METHOD FOR ESTIMATION OF THE RISK OF FRACTURE WITHIN THE THINNING ZONE ON WALLS OF MAIN PIPELINES


Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                       0957-798X (print)
Issue                       № 5, 2010 (May)
Pages                      10-14
 
 
Authors
V.I. MAKHNENKO, E.A. VELIKOIVANENKO, G.F. ROZYNKA and N.I. PIVTORAK

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
It is shown that application of the mathematical models, which are based on elimination of such assumptions as direct normals and a plane stress state, in deformation of the thinning zone in pipeline walls and presence of one local critical point with extreme (determinate) fracture conditions allows revealing the effect of peculiarities of an internal or external defect on a limiting pressure, as well as behaviour of a material within the deformation range from the beginning of plastic flow to fracture.
 
 
Keywords: welded pipelines, wall thinning, risk of fracture, improvement of estimation method, probability of fracture, Weibull law parameters, limiting pressure, external (internal) thinning defects
 
 
Received:                ??.??.??
Published:               28.05.10
 
 
References
1. (2000) Fitness-for-service. American Petroleum Institute Recommended Practice.
2. (1968) Strength, stability, oscillations: Refer. Book. Vol. 1. Ed. by I.A. Birger, Ya.G. Panovko. Moscow: Mashinostroenie.
3. Makhnenko, V.I. (1976) Calculation methods for investigation of the kinetics of welding stresses and strains. Kiev: Naukova Dumka.