Journal
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
Volume 144, Issue 3, Pages -Publisher
ASME
DOI: 10.1115/1.4052777
Keywords
contact mechanics; friction; interface; micro-tribology; stick-slip; surface roughness and asperities; surface treatments; surfaces; tribological systems
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Funding
- H2020 FET Open Boheme [863179]
- European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie grant [754462]
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In this study, benchmark experiments were conducted to evaluate the frictional properties of laser patterned low-density polyethylene. It was found that the friction increases with humidity and that the experimental results are in good agreement with numerical simulations. The introduction of a deviation term improved the quantitative results of the model.
We describe benchmark experiments to evaluate the frictional properties of laser patterned low-density polyethylene as a function of sliding velocity, normal force, and humidity. The pattern is a square lattice of square cavities with sub-mm spacing. We find that dynamic friction decreases compared to nonpatterned surfaces, since stress concentrations lead to early detachment, and that stick-slip behavior is also affected. Friction increases with humidity, and the onset of stick-slip events occurs in the high humidity regime. Experimental results are compared with numerical simulations of a simplified 2D spring-block model. A good qualitative agreement can be obtained by introducing a deviation from the linear behavior of the Amontons-Coulomb law with the load due to a saturation in the effective contact area with pressure. This also leads to the improvement of the quantitative results of the spring-block model by reducing the discrepancy with the experimental results, indicating the robustness of the adopted simplified approach, which could be adopted to design patterned surfaces with controlled friction properties.
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