Kobets A.S., Dyrda V.I., Kalhankov Ye.V., Tsanidi I.M., Chernii O.A. Abrasive fatigue wear rubber lining in the context of fractal analysis

Details

Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 144

Geoteh. meh. 2019, 144, 103-110

https://doi.org/10.15407/geotm2019.144.103

Abrasive fatigue wear rubber lining in the context of fractal analysis

¹Kobets A.S., ²Dyrda V.I., ²Kalhankov Ye.V., ²Tsanidi I.M., ²Chernii O.A.

¹Dnipro State Agrarian and Economic University,Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine

UDC 622.23:05459

Language: Ukrainian

Abstract.

The article provides an analysis of the work on the mechanics of the destruction of materials and possible solutions to the problems of predicting their resource. One of such ways is the method of fractal assessment of fracture surfaces, but very few papers consider the destruction of rubber parts, especially rubber linings, working under conditions of abrasive fatigue wear.

Investigating the surface of the lining, it was found that the lining which was not in use has cords, broken rubber fragments but not torn off, that is, the rubber resists tearing, a similar situation with rubber taken from a depth of 30 mm and more. Rubber obtained from depths of 5 and 15 mm has more uniform grooves, has few cords and has almost no torn rubber fragments, there are upper layers of the lining at first aging (from the effect of fatigue wear), and then it is erased by loading.

Exactly the method of fractal evaluation of the surface of the destruction of the rubber lining allows you to determine the macrostructural characteristics of rubber according to the values of the microstructural parameters of the material without any fitting coefficients. Research results indicate that the rubber breakdown process is non-linear; obviously, in local zones, that is, in zones of intense material destruction, the nonlinearity of the process will be greater than the average for the sample. So in the work, the change in the physico-mechanical properties of a rubber lining along its height was investigated and it was established that a rubber lining changes its properties gradually, that is, it is aging. The aged layer is 10-15 mm, as evidenced by the fractal dimension, which decreases to a depth of 15 mm and then is restored to its original value at a depth of 30 mm. This suggests that as a result of the shock-scratching effect of the boot, the rubber ages and loses its properties. This leads to a decrease in the ability of rubber to resist wear and it is erased, at the same time, new layers gradually grow old and lose their properties. Thus, the fractal assessment makes it possible to predict the state of the rubber lining, both on the surface of the material and inside.

The results of studies of the dynamics of wear of the rubber lining and its connection with the fractal dimension are also given, so the fractal dimension of the new lining is 2.8472, and after operating 7,560 hours – 2.8204. Studies have shown with a decrease in the height of the lining plate, the fractal dimension also decreases. So for a new plate with a height of 270 mm, the fractal dimension is 2.8472 and for a plate with a wear of 43 mm – 2.8204, which makes it possible to predict the durability (aging) of a rubber lining by its fractal dimension.

Keywords:

fractal, fractal dimension, wear, fracture, rubber lining, cluster, surface of destruction, fatigue wear, abrasive wear

References:

1. Bulat, A.F. and Dyrda, V.I. (2005), Fraktaly v geomehanike [Fractals in geomechanics], Naukova dumka, Kyiv, Ukraine.

 2. Bolshakov, V.I., Volchuk, V.N. and Dubrov, Yu.I. (2005), Fraktaly v materialovedenii [Fractals in materials science], PGASA, Dnipropetrovsk, Ukraine.

 3. Mandelbrot, B. (2002), Fraktalnaya geometriya prirody [Fractal geometry of nature], In-t kompyuternykh issledovaniy, Moscow, Russia.

 4. Ivanova, V.S. (1990), "Fractal fracture mechanics. Tasks and prospects for practical use", Samoorganizuyuschiesya i fraktalnyie struktury, Ufim. neft. in-t, Ufa, USSR.

 5. Shchelokova, M.A., Korotunova, Ye.V. and Mastinovskiy, Yu.V. (2005), "Fractal approach to solving the problem of damage accumulation", Novi materialy i tekhnolohiyi v metalurhiyi ta mashynobuduvanni, no. 2, pp. 80-83.

 6. Gorulya, P.E. (1989), "Modeling the process of destruction of inhomogeneous solids on the basis of percolation theory", Matematicheskoye i elektronnoye modelirovaniye v mashinostroyenii, pp. 47-53.

 7. Dyrda, V.I., Kalhankov, Ye.V., Tsanidi, I.M. et al. (2018), "Specificity of rubber-metal elements calculation with taking into account effect of bulk compression", Geo-Technical Mechanics, no. 138, pp. 160-168.

https://doi.org/10.15407/geotm2018.01.160

 8. Kalhankov, Ye.V. (2017), "Features of fractal analysis of fractured surfaces of the rubber liners, which work in conditions of abrasive and fatigue wear", Geo-Technical Mechanics, no. 133, pp. 66-74.

 

About the authors:

Kobets Anatolii Stepanovych,Doctor of Public Administration, Professor, Rector, Dnipro State University of Agriculture and Economics, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Dyrda Vitalii Illarionovych, Doctor of Technical Sciences (D. Sc.), Professor, Head of Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kalhankov Yevhen Vasylovych,Ph. D. Student in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Tsanidi Ivan Mykolaiovych,Ph. D. Student in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM NASU), Dnipro, Ukraine

Chernii Oleksandr Anatoliiovych, Ph. D. Student in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov NAS of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

• < Prev
• Next >