Abstract
The complex nature of slip-rolling contacts in many applications such as gear tooth flanks, rolling bearings, and heavy machinery often makes determining the friction and wear properties, as well as the fatigue resistance, of tribosystems difficult. The establishment of the tribological profile of a tribocouple under high Hertzian contact pressure and under slip-rolling will allow for the measurement and comparison of friction and wear coefficients as well as slip-rolling resistance by continuously monitoring the wear rate, coefficient of friction, temperature, oil film thickness, and/or electrical contact resistance using high-resolution signal analysis (HRA). A twin disc system can provide insight into the adhesive behavior of material and lubricant products such as alternative base oils and additives, ceramics, alloys, and thin film coatings. The strength and endurance of these products are often characterized through fatigue and resistance tests, which apply high Hertzian contact pressures to the rolling contact until seizure or failure is obtained. The further observation of the formation of tribofilms on the surface of contact yields information about the reactivity and thermochemical properties of additives. This review aims to illustrate how the implementation of different screening methodologies can be used as a meaningful tool for assessing the aforementioned tribological profile properties for the development of slip-rolling tribosystems.
Highlights
A slip-rolling contact is one where the surfaces in contact with each other are rotating against each other with a specified percentage of slip
Reducing the size of tribological components is seen as an important approach to both reduce carbon emissions and increase efficiencies, especially in the automotive industry [4,5]
This paper aims to illuminate different test modes of the 2disk tribometer as an example of a twin disc tribometer when examining the tribological profile of various coatings, additive packages for lubricants, and different types of steel
Summary
A slip-rolling contact is one where the surfaces in contact with each other are rotating against each other with a specified percentage of slip. Examples of these contacts include tooth flanks, rolling bearings, cam-follower systems, continuous variable transmissions, toroidal gears, ball-screw and ball-nut drives, planetary roller screws, synchronous rings, and wheel–rail contacts. Lightweight approaches to develop cheaper machine parts and meet growing efficiency targets have placed strain on the physical capabilities of slip-rolling contacts in many industries, including heavy industry, the automotive industry, and metallurgy. In systems that involve the use of bearings and gear components, the pursuit of lightweight design has increased torque and Hertzian contact stresses, shortening the lifetime of these parts without proper lubrication [2,3]. Reducing the size of tribological components is seen as an important approach to both reduce carbon emissions and increase efficiencies, especially in the automotive industry [4,5]
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