An influence of adhesion force and strain hardening coefficient on the rate of adhesive wear in a dry frictional contact
In the paper, we consider the tangential contact of the single microasperities of interacting surfaces, the mechanical characteristics of which are close to the characteristics of typical rail steels. Using computer simulation by the method of discrete elements, we studied the influence of the parameters of adhesive interaction of both external and internal surfaces on the regime of wear of asperities. It has been established that with an increase in the work of adhesion, the wear regime changes from slipping (low wear) to grinding or brittle fracture of asperities (high wear), and this change is of a threshold nature. We revealed an empirical sigmoidal dependence of the position of the border between two wear regimes (namely, the threshold value of adhesive stress) on the value of material’s strain hardening coefficient. It is shown that the logistic nature of this dependence is due to the competition of two mechanisms of elastic strain energy dissipation, which determine the mode of wear. These are plastic deformation and adhesion of the contacting surfaces. Special discussion is devoted to the question of the influence of the scale factor on the “threshold” values of the material’s mechanical characteristics, which provide the change of wear regime.
Keywords
адгезивный контакт,
разрушение,
режимы износа,
моделирование,
дискретные элементы,
adhesive contact,
fracture,
wear regimes,
computer modeling,
discrete elementsAuthors
| Dimaki A.V. | Institute of Strength Physics and Materials Science of SB RAS | dav@ispms.tsc.ru |
| Dudkin I.V. | Institute of Strength Physics and Materials Science of SB RAS | pokrovitelchar@mail.ru |
| Popov V.L. | Technische Universität Berlin, Berlin; National Research Tomsk State University | v.popov@tu-berlin.de |
| Shilko E.V. | Institute of Strength Physics and Materials Science of SB RAS; National Research Tomsk State University | shilko@ispms.tsc.ru |
Всего: 4
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