Using fractal characteristics to analyze the development of whole-rolled wheel destruction
| Autor: | Sergey Urushev, Igor Ivanov, Gubenko Svetlana I, Dmitry Kononov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
0211 other engineering and technologies technology industry and agriculture Mechanical engineering 02 engineering and technology respiratory system Engineering (General). Civil engineering (General) 020303 mechanical engineering & transports Fractal 0203 mechanical engineering 021105 building & construction Development (differential geometry) natural sciences TA1-2040 human activities circulatory and respiratory physiology |
| Zdroj: | MATEC Web of Conferences, Vol 329, p 02009 (2020) |
| Popis: | Purpose: Determination of mechanical characteristics of wheel steel by analyzing the development of destruction of solid-rolled wheels. Methods: Determination of the crack resistance of all-rolled wheels by testing samples from wheel steel for off-center tension with an edge crack, fractal parametrization of the fracture relief by processing the fracture photo using the R/S analysis method for fracture sections, which allows determining both the total fractal dimension of the fracture (the average for all sections), and in a specific area where there are changes in the fracture morphology. Construction of the dependence of the crack resistance parameter on the fractal dimension. Results: The possibility of analyzing wheel steel fractures by studying their fractal dimension is determined. A method of fractal parametrization of the wheel steel fracture relief is developed, which allows to obtain the value of the fractal dimension in different directions of crack growth. The fractal dimension of wheel steel is determined for different hardness values (after annealing and after thermal improvement). The dependence of the fractal dimension on the ductility characteristics of wheel steel is revealed: the lower the ductility characteristics (elongation, relative contraction) and, accordingly, the higher the hardness, the lower the value of the fractal dimension. The dependence of the fractal dimension on the coefficient of crack resistance of wheel steel KIC is determined, which makes it possible to predict the crack resistance of wheel steel depending on the fractal dimension of the fracture, as well as to judge the nature of the fracture – brittle, viscous or fatigue. Practical significance: The use of fractal fracture parameterization avoids time-consuming tests when determining the mechanical characteristics of wheel steel, as well as to determine the mechanical properties in the case when other methods are no longer applicable (small sample sizes). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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