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2020 №02 (04) DOI of Article
2020 №02 (06)

Technical Diagnostics and Non-Destructive Testing 2020 #02
Technical Diagnostics and Non-Destructive Testing #2, 2020, pp. 31-36

Analysis of semi-empirical equations for determination of stress concentration in volumetric damages on pipeline surface

P.S. Yukhymets1, L.J. Yurko1, S.V. Kobelsky2, V.I. Kravchenko2
1E.O. Paton Electric Welding Institute of NASU, 11 Kazymyr Malevych, Kyiv, 03150. E-mail: office@paton.kiev.ua
2G.S. Pisarenko Institute for Problems of Strength of NASU, 2 Timiriyazivs’ka str., Kyiv, 01014, Ukraine. E-mail: ips@ipp.kiev.ua

The paper deals with comparative analysis of some equations for calculation of stresses in a corrosion damage zone on pipeline surface. Stresses calculated by FEA in the area of volumetric surface defects were used as the reference values. The geometric parameters required for calculations were presented as a corresponding set of random independent values that varied within certain limits. Optimal dependencies were determined, the application of which provides moderately conservative values and a relatively narrow range of low values of stress concentration factor, when calculating the maximum stresses in the defects on the outer and inner surfaces, respectively. Ref. 19, Tabl. 3, Fig. 5.
Keywords: stress concentration, corrosion defects, pipelines

Received: 19.11.2019


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