Funct. Mater. 2024; 31 (3): 381-386.
A fractal approach to estimating the durability of critical parts
1Kharkiv National Automobile and Highway University, 25 Yaroslava Mudrogo Str., 61002 Kharkiv, Ukraine
2Prydniprovska State Academy of Civil Engineering and Architecture, 24a Architect Oleh Petrov Str., 49000 Dnipro, Ukraine
The method of evaluating the effectiveness of strengthening technologies for increasing the durability of hydraulic hammer parts by means of detonation spraying is considered. Indicators of crack resistance in the controlled cross-section of the striker and peaks during strengthening by this material increases by 1.3-2.4 times compared to the initial state without spraying. For an express analysis of the mechanical properties of the striker and the hydraulic hammer pick after detonation spraying, the fractal formalism was applied, which made it possible to predict the strength index &sigma:B for the body at the pair correlation coefficient R2=0.8351, for σ0.2– at R2 = 0.7534, and the plasticity index for the pick with R2 = 0.7827, hardness – with R2 = 0.8682. The fractal dimension of the microstructure was calculated at a magnification of 100.
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