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Subject: Rubber friction ×

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    A Comprehensive Study about the Role of Crosslink Density on the Tribological Behavior of DLC Coated Rubber
    (Basel : MDPI, 2020) Bayrak, Suleyman; Paulkowski, Dominik; Stöckelhuber, Klaus Werner; Staar, Benjamin; Mayer, Bernd
    The friction and wear behavior of coated rubber components is strongly dependent on the substrate properties. This work deals with the impact of the crosslink density, i.e., the hardness of the rubber substrate on the tribological performance of uncoated and coated rubber. The hardness of nitrile butadiene rubber (NBR) is varied altering the sulfur content. Both the uncoated and coated rubber samples are characterized in terms of surface and mechanical properties. Tribological tests comprise the examination of the macroscopic contact area and the temperature in the contact zone. It was found that the functional layer enhances the wear resistance significantly. Apparently, the wear and friction behavior of the coated rubber correlates with the hardness and the bulk properties of the substrate material.
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    On the viscous dissipation caused by randomly rough indenters in smooth sliding motion
    (Amsterdam : Elsevier, 2021) Sukhomlinov, Sergey; Müser, Martin H.
    The viscous dissipation between rigid, randomly rough indenters and linearly elastic counter bodies sliding past them is investigated using Green’s function molecular dynamics. The study encompasses a variety of models differing in the height spectra properties of the rigid indenter, in the viscoelasticity of the elastomer, and in their interaction. All systems reveal the expected damping linear in sliding velocity at small and a pronounced maximum at intermediate . Persson’s theory of rubber friction, which is adopted to the studied model systems, reflects all observed trends. However, close quantitative agreement is only found up to intermediate sliding velocities. Relative errors in the friction force become significant once the contact area is substantially reduced by sliding.