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Friction force generated in lubricated cutting of steel is experimentally estimated by recording the tangential force experienced by the spherical face of a pin rubbing against a freshly cut surface. The pin and the cutting tool are both submerged in the lubricant and the pin is situated on the cut-track to record the force. The recording shows an instantaneous achievement of a peak in the force curve...
This paper presents a methodology for the modelling of the variability of brake linings. The impact of the contact surface topography on thermal and braking noise issues is well known but the behaviour of its variability is still barely studied. We propose to introduce it in finite element models using stochastic processes (e.g. random variables and random fields). Therefore, the surfaces of pads...
This study has a specific focus on the tribological characteristics of the tribopair, which consists of high velocity oxy-fuel (HVOF) spraying WC–10Co–4Cr coating and sintering Si 3 N 4 with 5% SiC whisker, lubricated under the silt-laden water. The friction coefficient and abrasive wear rate were measured to evaluate the friction and wear characteristics under a range of test conditions,...
In a ball-on-disc wear test, an alumina ceramic body sliding against a silicon nitride ceramic body in water achieved an ultra-low friction coefficient (ULFC) of 0.004. The profilometer and EDX measurements indicated that the ULFC regime in this unmated Al 2 O 3 –Si 3 N 4 pair was achieved because of the formation of a flat and smooth interface of nanometric roughness,...
In the present work, nano ZrO 2 reinforced polybenzoxazine composites were produced. The friction behaviors of ZrO 2 –polybenzoxazine nanocomposites were evaluated on a chase friction material test machine. An attempt was made to examine the variation of storage modulus, loss modulus and glass-to-rubber transition on the effect of the temperature, load and speed sensitivity of ZrO...
Modern rubber friction theories predict the friction coefficient of rubber sliding against a rough surface. The key inputs of these theories are the roughness of the surface, the viscoelastic properties of the rubber, and the operating parameters like contact pressure, sliding speed and temperature. With regard to the surface roughness, it is important to know how road surface roughness should be...
The tire–pavement contact is part of a complex tribo-system with several variables. Once the pavement surface and the rubber tire are directly and indirectly related to transportation safety, fuel consumption, wear rate, noise generation, and others, it is possible to state that a better understanding of tribo-logical variables may provide a deeper knowledge of friction and wear phenomena. In this...
Copper fibres are used in the composition of car and truck brake pads and they play a major role on the braking efficiency. The purpose of this study is to understand the behaviour of Cu particles in the interfacial contact area of steel against steel sliding surfaces. In this sense, pin on disc tests were carried out with the addition of particulate interfacial media to investigate the evolution...
This study investigated the frictional behaviors and sealing performance of three seal polymer materials. Tests were conducted on a special test rig of the sealing ring. Polytetrafluoroethylene (PTFE), polyimide (PI), and polyetheretherketone (PEEK) composites were tested in the test rig with a sealing ring configuration against the steel counter surface. Investigations through scanning electron microscopy...
Poly-ether-ether-ketone (PEEK) is a high-performance, temperature-resistance polymer that is finding an increasing range of applications. In order to even enhance PEEK׳s mechanical and tribological properties particles of different compositions, shapes and sizes are added into its matrix. PEEK has already been combined with many different particles; however, very rarely MoS2 and WS2 – two state-of-the-art...
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