Efficiency of surface texturing in the reducing of wear for tests starting with initial point contact

Zou, Hongbo; Yan, Shuai; Shen, Tong; Wang, Haoji; Li, Yining; Chen, Jingyue; Meng, Yaqi; Men, Shichao; Zhang, Zhongjiang; Sui, Tianyi; Lin, Bin

doi:10.1016/j.wear.2021.203957

Cited by 13 publications

(4 citation statements)

References 95 publications

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“…This phenomenon indicated that there was certain initial wear in each experiment due to the large initial contact pressure. [ 29 ] Relatively large initial COFs of high‐temperature experiments indicated that temperature is the most important factor affecting the initial wear and the pressure‐bearing capacity. In addition, the COFs of Experiments 7, 8, and 9 (120 °C: circle, pentagonal, and triangle) all decreased after maintaining for a while, and their durations increased sequentially, which had the same trend as the B factor (ratio).…”

Section: Resultsmentioning

confidence: 99%

Effect of Oil‐Soluble Graphene on the Tribological and Rheological Properties of Magnetorheological Fluids

Zhang

et al. 2022

Adv Eng Mater

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Magnetorheological fluid (MRF) is a widely utilized intelligent material that faces the in‐use thickening (IUT) problem caused by wear. As commonly being used polar antiwear agents aggravate the sedimentation of MRF, a new method to improve the tribological properties of MRF using nonpolar oil‐soluble graphene rather than polar additives is proposed. Orthogonal and control experiments conducted with a four‐ball machine show that oil‐soluble graphene greatly improves the antiwear performance of MRF. More specifically, the MRF with oil‐soluble graphene reduces wear volume up to about 90% compared with all control experiments, including blank samples without any additives, the samples with the surfactant but without graphene, and the ones with the commercial antiwear agent ZDDP. The results also indicate that both lubricant and MRF get the best antiwear effect when graphene concentration in the base oil is 2 mg ml−1. This implies that oil‐soluble graphene improves the tribological properties of the systems primarily by enhancing the pressure‐bearing capacity of the carrier fluid. Moreover, oleophilic graphene increases the magnetorheological effect of MRF and reduces its off‐state viscosity by about 4% through isolating particles and filling gaps. In summary, the proposed method can solve the IUT problem of MRF along with ensuring its performance.

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Section: Resultsmentioning

confidence: 99%

Effect of Oil‐Soluble Graphene on the Tribological and Rheological Properties of Magnetorheological Fluids

Zhang

et al. 2022

Adv Eng Mater

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“…However, little effect or even negative effects were also reported compared with texture-free surfaces, if the surface texture is not appropriately designed and/or fabricated in some cases. Laser surface texturing is most studied and a widely applied technology, which has been used in surface modification of piston ring [479], on stator surface in ultrasonic motors [480], on the Ti-6Al-4V biomedical materials combined with chemical assembly of a graphene oxide film [481], on a Si 3 N 4 disc sliding in water against a Si 3 N 4 ball [482], on UHMWP samples for bio-implants [483], on TC4 (Ti-6Al-4V) titanium alloy disc sliding against a UHMWP ball in simulated body fluid (SBF) [484], on a lead bronze coating surface [485], on a 42CrMo4 steel disc reciprocating under starved lubrication [486], and on the water-lubricated thrust ball bearing washer surface made of high density polyethylene (HDPE) specimens, manufactured using 3D printer technology [487]. Ding et al [488] constructed 3 types of dimpled surfaces, type A: 'wide & deep' by pico-second laser ablation, type B: 'narrow & shallow' by one-step post-polishing type A, and type C: 'wide & shallow' by two-step postpolishing of type A, on a smooth AMS5630 440C stainless steel sample for investigation the effect of surface texturing on material transfer behavior of the X1 PTFE/glass fiber woven fabric composite (bonded by phenolic resin) when sliding against the textured steel samples.…”

Section: Reductive Surface Texturingmentioning

confidence: 99%

A review of advances in tribology in 2020–2021

Meng

et al. 2022

Friction

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Around 1,000 peer-reviewed papers were selected from 3,450 articles published during 2020–2021, and reviewed as the representative advances in tribology research worldwide. The survey highlights the development in lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology, providing a show window of the achievements of recent fundamental and application researches in the field of tribology.

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“…Friction and wear processes on lubricated surfaces reduce the tribological properties of mechanical systems and increase the emission of pollutants. Surface texturing technology is a processing method for preparing micro-structures (micro-grooves and micro-textures) with certain geometric parameters on the friction pair [31,32]. With the development of processing technology, investigations on the friction-reduction effect of textured surfaces have attracted increasing attention from scholars.…”

Section: Introductionmentioning

confidence: 99%

Effects of manufacturing errors and micro-groove surfaces on the static and dynamic characteristics of water-lubricated bearings

Shi

et al. 2023

Phys. Scr.

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In this paper, the effects of manufacturing error and micro-groove on the static, dynamic and stability characteristics of water-lubricated journal bearings (WLJBs) are investigated. Mathematical expressions of manufacturing errors and surface micro-groove are presented, and the Reynolds equations with steady and unsteady states are calculated by using the linear perturbative method and the finite difference technology. According to the developed model, the effects of the waviness magnitude, spatial number, and phase angle for circumferential errors, as well as the concavity, convexity, and taper for axial errors on the film thickness distribution, fluid pressure distribution, bearing capacity, coefficient of friction, side leakage flow rate, attitude angle, stiffness coefficient, damping coefficient, threshold speed and whirl frequency ratio of WLJBs are evaluated. Simulation results demonstrate that fluid film thickness distribution and fluid pressure distribution are significantly affected by manufacturing errors and micro-groove. Compared with axial manufacturing errors, circumferential manufacturing errors cause an inhomogeneous distribution of fluid pressure and morphological transformation in the high-pressure zone. The variation rules for the lubrication performance of bearings with circumferential waviness, concavity, convexity, and taper errors are not consistent at various eccentricity ratios. The magnitude of the concavity and taper errors may have an improving effect on the bearing performance, whereas circumferential waviness and convexity error play a negative role. Moreover, the micro-groove with partial distribution enhances the hydrodynamic effect in the bearing clearance. Numerical simulations can provide a valuable reference for the manufacturing and design of bearing systems.

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Efficiency of surface texturing in the reducing of wear for tests starting with initial point contact

Cited by 13 publications

References 95 publications

Effect of Oil‐Soluble Graphene on the Tribological and Rheological Properties of Magnetorheological Fluids

Effect of Oil‐Soluble Graphene on the Tribological and Rheological Properties of Magnetorheological Fluids

A review of advances in tribology in 2020–2021

Effects of manufacturing errors and micro-groove surfaces on the static and dynamic characteristics of water-lubricated bearings

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