Acta Univ. Agric. Silvic. Mendelianae Brun. 2016, 64(3), 825-833 | DOI: 10.11118/actaun201664030825

Analysis of the Effect of Loading Process on Tribological System Properties

Radoslav Majdan¹, Rudolf Abrahám¹, Marián Kučera², Peter Haas²

¹ Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovak Republic

² Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, Slovak Republic

The effect of loading on the properties of selected sliding pair is monitored and analysed in the submitted contribution. The obtained results of dynamic loading were also compared with static loading. The experimental tests were performed using the testing machine Tribotestor M10. Steel 11 600 was selected as a material sample for the shaft as it belongs to commonly used materials in the manufacturing of agricultural components of shaft type or pin type. A full-bronze centrifugally moulded bearing shell from the material CuSn12 was selected as the second element of friction pair. Two oils were selected for lubrication of friction node - the mineral gear oil Madit PP80 and ecological oil Plantohyd 46 S. The selected friction pairs were tested in three loading regimes according to the methodology (two dynamic processes and one static process). 60 tribological tests were performed, i.e. 10 for each type of loading and lubrication. The weight losses of the friction pair elements were part of the tracked and analysed parameters. The polluted oil was examined using the ferrographic analysis to verify the weight losses. The abrasion particles of friction pair and their contribution to oil pollution were also analysed. Following the performed experiments different effects of loading regimes may be concluded, essentially in terms of wear size and the number and size of wear particles as well. The obtained results confirmed that the power spectral density of generated signal is probably an important criterion for assessment in terms of simulated random dynamic load in given experiment. In terms of technical application in loading processes - power spectral density is actually the amount of energy supplied to the process.

Keywords: Tribotestor, random process, dynamic processes, static process, lubrication, sliding node

Grants and funding:

Experiments were carried out under the project support science and research VEGA: 1/0227/15 Study of tribological characteristics of the new high hard coatings on materials suitable for gearings.

Prepublished online: July 4, 2016; Published: July 1, 2016  Show citation