Abstract
In the present study, PA6 polymers with and without solid lubricant inclusions were investigated against S1100QL steel surfaces that had different surface roughness values—a very high surface roughness (Rz ≈ 40 µm) and a low surface roughness (Rz ≈ 5 µm). Static and dynamic friction coefficients were analysed under a series of nominal contact pressures (2.5 to 40 N/mm2) considering the influences of polymer water saturation, temperature, counter-body surface roughness and lubrication. Mechanisms for the observed influences of the respective parameters are provided and are interpreted from the view of the adhesive and deformative contributions to the friction force.
Highlights
◦ are shown in Figure 10 and in and unlubricated conditions unlubricated conditions at 22 at
It is noting worth noting hereunlubricated that unlubricated tribological
For the investigated polymer-steel tribological systems that have different surface roughness obtained at 22 ◦ C (Figure 13a)
Summary
Polymers have gained a tremendous interest among the scientific and industrial communities as an alternative to metals in a variety of engineering applications, mainly due to their relatively low cost, ease of processing even complex component geometries through a variety of production processes, chemical inertness, the ability to be used in dry friction and recyclability [1,2,3,4]. Measured compressive yield stress (σdF), the coefficient of friction resulting from rough surfaces may be described by the following equation [9]: affects the static friction of such pairings. Should seen as nominal values of an elastic contact (neglecting any plastic deformation of the polymer), the penetration of a single roughness peak of the metallic counterpart into a smooth polymer surface can be described by a. As already published elsewhere [10], the friction force (FR ) is a product of the shear strength τs of the materials and the real contact area (Ar ) between both surfaces: By assuming the presence of a correlation between penetration depth (h of Equation (1)) and measured compressive yield stress (σdF ), the coefficient of friction resulting from rough surfaces may be described by the following equation [9]:. The above equation may be used in order to describe the load dependency of the coefficient of friction for polymers on rough surfaces, wherein for polymers the exponent n < 1 [9]
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