Experimental and Numerical Investigation of Friction Coefficient and Wear Volume in the Mixed-Film Lubrication Regime with ZnO Nano-Particle

Abstract

One of the most important challenges industry has always been facing is the wear phenomenon. Wear is the cause of huge deteriorations in parts and results in a drop in performance and lifetime of different machines. Therefore, finding solutions to reduce friction coefficient and wear is of special importance. The present research aims at numerical and experimental investigation of friction coefficient and wear in the presence of nano-lubricants. In the numerical section, to tackle different scales of contact components, two sub-models are developed. In the first one, contact of asperities is modeled and the properties of contact surfaces are taken into account. Second sub-model simulates nano-particles in the contact region. Furthermore, a series of experiments are conducted under different loads, speeds, and different values for Zinc Oxide nano-particle weight percent using a pin-on-disk test rig. Results show that predicted friction coefficient and wear volume in theory are reasonably in agreement with experimental results. It was found that adding nanoparticle to the lubricant can be beneficial in terms of friction reduction.

Experimental investigation of thermo-physical and tribological properties of oil-based graphene oxide nano-fluid using two types of polysorbate (tween 20 and tween 80)

“…[1][2][3][4] Various types of nanoparticles made of metallic, organic, and inorganic materials have been used by researchers to develop nanolubricants. [5][6][7][8] Among all these additives, Graphene Oxide (GO) can be obtained easily from graphite making it a potential candidate to be used in industrial units.…”

“…1–4 Various types of nano-particles made of metallic, organic, and inorganic materials have been used by researchers to develop nano-lubricants. 5–8 Among all these additives, Graphene Oxide (GO) can be obtained easily from graphite making it a potential candidate to be used in industrial units. Graphene is a two-dimensional material and has shown unique friction and wear properties including high load-bearing limit, low shear stress, and weak Van der Waals forces between the layers.…”

Research on Elastic–Plastic Contact Behavior of Hemisphere Flattened by a Rigid Flat

“…Contact between two rough surfaces can be equivalent to contact between a hemisphere and a rigid flat [11][12][13]. The study of elastic-plastic contact behavior between hemisphere and a rigid flat is of great significance to the analysis of electrical contact [14][15][16][17], friction [18,19], and wear [20,21] between two rough surfaces.…”

Multi-objective Optimization and Sensitivity Analysis of the Parameters Affecting Sealing Performance of the Piston Rings Face through the Validated Model for the Four-stroke Bi-fuel Engine

“…The piston-rings pack's primary function is to prevent lubricant oil consumption and combustion chamber gas leakage (Ahmed Ali et al 2016;Sohrabiasl et al 2017). In other words, aside from the sealing process the piston reciprocating movement presents a challenge for investigators and engine manufacturers due to difficulties in controlling friction and wear (Rahmani et al 2017;Gholami et al 2020;Saligheh et al 2020).…”