The Paton Welding Journal, 2022, №04



2022 №04 (07)

DOI of Article 10.37434/tpwj2022.04.08

2022 №04 (01)

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The Paton Welding Journal, 2022, #4, 51-59 pages

Application of fractal analysis in diagnostics of technical condition of metal structure elements

V.V. Usov¹, M.D. Rabkina², N.M. Shkatulyak¹, N.I. Rybak¹, O.O. Stofel³

¹K.D. Ushinskyi South-Ukraine National Pedagogical University 26 Staroportofrankivska Str., 65020, Odessa, Ukraine
²E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: valentinusov67@gmail.com
³National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» 37 Peremohy Ave., 03056, Kyiv, Ukraine

Abstract
It is shown that fractal analysis, as an additional tool of technical diagnostics and nondestructive testing, allows determination of the most important features of the condition and behaviour of metal structure elements during their operation and failure. Examples of application of fractal dimension of the fractures are presented, in order to assess the critical dimension of brittle cracks and to determine its effect on impact toughness, yield limit, ultimate strength, and failure pressure at hydraulic testing, and to detect the interrelation of fractal dimension with fatigue life after low-cycle fatigue fracture of metal of pipeline welded joints. It is found that the nature of fractal dimensions of the fractures and diagrams of time dependence of the applied load at impact loading is due to the direction of cutting and temperature of testing the specimens. It is shown that the main component of {001} <<110>> texture of low-alloyed steel promotes an increase of fractal dimension of the fractures and development of brittle fracture at impact testing.
Keywords: impact testing, fractal dimension, brittle crack, destruction

Received: 16.12.2021
Accepted: 30.06.2022

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Suggested Citation

V.V. Usov, M.D. Rabkina, N.M. Shkatulyak, N.I. Rybak, O.O. Stofel (2022) Application of fractal analysis in diagnostics of technical condition of metal structure elements. The Paton Welding J., 04, 51-59.

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