In normal tribological condition when silding speed increase wear volum loss increase but at certain increasing speed wear volum loss deacrease, why?
Dear Tekkouk Nazih,
When you continuously increases the sliding velocity, kinematic coefficient of friction is decreased. This is the cause for decreasing wear loss at higher speed.
Best regards
PS Manoranjan Jena
Hi
It could be due to a strain hardening of the surface of the tested sample at a certain sliding velocity, you are observing decrease of the wear volume loss rather than increase of the wear volume loss.
In other words, the wear resistance of the surface has increased due to the strain hardening of the surface.
More details about the experiment you are running would be needed, if you are in lubricated conditions the most probable answer to your question is a change in the lubricating regime (for example. from boundary to hydrodynamic lubrication)
Hello! It could happen because in the friction pair with increasing of sliding speed the friction coefficient, as rule, decreases and therefore there is possible the decreasing of volume wear too, due to the direct-proportional dependance of friction coefficient and wear.
It is possible in some cases that above some value of sliding speed so called tribologically transformed layers (or dissipative structures) with higher wear resistance arise.
Actually, the answer of this question is complicated a little bit. We can not say that the wear rate decreases as the sliding speed increases "in general"I mean. Therefore, it would be better if you inform us about the sliding conditions. Even the materials of rubbing surfaces. Whether it contains a third phase lubricating regime or not. In many cases the wear rate increases as the sliding speed increases as the materials which contains graphene Nano platelets. It is my pleasure to help you to give you more details if you need.
Best regards
I think that you ask a fundamental question whose answer requires to refer to the microscopic processes of breaking of the chemical bonds and the processes of defects (point defects and dislocations). I am sending you a recent article that can help you.
Electron-trapping and energy localization in insulating materials. Technological impact of space charge electron-beam characterization
AIP Advances 8, 095228 (2018); https://doi.org/10.1063/1.5047673
The key words ADHESION, LUBRICATION, WEAR, appear only in references 39 and 57 but contrary to appearances this work relies heavily on friction experiments and related disciplines (luminescence and fractoemission measurements). The temperature in the friction interface plays a very important role. Indeed from a temperature threshold some dielectric processes no longer occur, the wear must decrease. To check it would for example heat the system so that this threshold is reached faster. To determine the temperature, for example, thermoluminescence measurements would be required to determine the "relaxation" temperatures of the defects. Choose the materials for the experiments to be easier.
The Gressus
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