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Differences in Tribological Behaviors upon Switching Fixed and Moving Materials of Tribo-pairs including Metal and Polymer

by:QUESTT     2020-07-01
Coefficient of friction (COF)
It is generally believed that between the two materials is the inherent property of the material itself.
In this study, stainless steel metal (304)and brass (H62)
And polypropylene polymer (PP)
Tested on standard ballson-three-
Plate testing machine.
When the friction material is fixed and moved, significantly different friction behaviors are observedpairs (metal/polymer)were switched.
For example, at the same load and speed, COF (0. 49)
About 2 between the rotating pp ball and the three fixed H62 plates.
3 times higher than the friction switch materialpairs.
At the same time, the COF between H62 and PTFE is relatively stable.
Unexpected friction behavior is attributed to the thermal and mechanical properties of the friction materialpairs.
Theoretical analysis shows that the maximum local temperature difference between fixed and moving materials for switching tribo-
The difference is consistent with that in the COF tested.
This result shows that the precise prediction of COF for both materials is complex and that thermal and mechanical properties should be properly taken into account when designing friction materials
Because these properties can significantly affect the friction performance.
Friction is a natural phenomenon that involves a variety of physical and chemical processes.
A large number of studies have been carried out to obtain a broad understanding and prediction of material friction behavior, thus guiding the design and application of various frictionspairs.
Considering the two parts of the trio
A pair of the same materials can be welded together easily, and the different materials are tribo-
Pairing in industrial applications.
The heat generation of friction interface is an important research topic in the field of friction.
Friction heat can lead to the decomposition of minerals such as lubricants.
Therefore, the thermal effect has been widely studied in the field of lubrication.
However, the effect of the thermal effect in dry friction on friction has not yet been fully disclosed.
Recently, Zhang.
The increasing trend of COF and temperature supporting the surface of graphene sliding Si tip was observed, which was attributed to the inhibition of thermal lubrication and the ripple of the structure. Laux .
It is pointed out that adhesive friction occurs between dynamic Ethereum hot ketone and static steel friction, which is caused by high local friction heat accumulated in the friction interface.
In addition, the interface temperature was studied by estimating the net contact area.
However, considering that the mechanical properties of the material always change with the change of temperature.
Friction heating not only changes the temperature of the sliding interface, but also has a complex impact on the friction properties of the material.
This effect is particularly observed in polymer materials, which can easily change from an elastic state to a highly viscous state.
People have developed
The linear theory of elasticity affects friction, where the speed of temperature rise depends on the thermal energy generated by local friction (
Related to surface roughness and sliding speed).
The heat and nano-interface layers of friction diffusion are used to explain the friction and wear of rubber tires rolling on the ground.
According to the theory of viscosity elasticity and heat transfer, the sliding friction of the interface is also a hot activation process, which can effectively reduce the barrier and increase the temperature.
Also, Babuska.
Display, PTFEPTFE)
When the interface temperature exceeds 127 °c, it is possible to re-crystallize along the interface and cause an increase in COF.
COF of two different materials (
Such as metal and polymer)
Should be kept constant at the same applied load and rotation speed. But Moghadas, .
Found COF of rotating metal (Co-27Cr-5. 5Mo-0. 06u2009C)
Ball friction with polymer (ultra-
High molecular weight polyethylene)
The socket is lower than the switch material of tribo-
Yes, because the polymer deformation of thermal action is not considered.
In this study, after switching between fixed and moving parts on the upper rotating ball friction test bench on three lower fixing plates, the COF differences between the two metal materials and polymer materials were observed.
Thermal analysis was performed to explain the observed phenomenon.
Exposes the effect of tribo-switching fixed and moving materials
Has an important impact on the performance of tribo
Pairing in industrial applications.
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