Showing papers in "Tribology International in 2014"

TL;DR: In this paper, the authors report the global fuel energy consumption in heavy-duty road vehicles due to friction in engines, transmissions, tires, auxiliary equipment, and brakes, and estimate that the parasitic frictional losses, with braking friction excluded, are 26% of the fuel consumption.

TL;DR: In this article, the tribological behavior of steel sliding pairs with dimples ranging from 15 to 800 µm in diameter was characterized in the mixed lubrication regime in a pin-on-disk experiment.

TL;DR: In this article, the effect of the viscosity modifiers on the film-forming properties of improved vegetable oil-based lubricants (high oleic sunflower (HOSO), soybean (SYO), and castor (CO) oils) was studied.

TL;DR: In this article, the anti-scuffing/anti-wear behavior and mechanism of an oil-miscible ionic liquid (IL), trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate, in a base oil at 1.0% concentration under both room and elevated temperatures were reported.

TL;DR: In this paper, an uncoupled damage model based on a thermodynamic potential function is used to model the crack initiation lifetime and a linear-elastic fracture mechanics approach under mixed-mode loading conditions has been considered.

TL;DR: In this article, the effects of eccentricity ratio on pressure distribution of water film are analyzed by computational fluid dynamics (CFD), and numerical analysis of journal bearings with different dimensions is undertaken under different rotational speeds.

TL;DR: In this article, serial sectioning was used to map WECs in their entirety that formed under non-hydrogen charged conditions for the first time, and it was shown that subsurface initiation of WEC at non-metallic inclusions is at least one mechanism of white etching crack formation.

TL;DR: In this paper, laser peen texturing (LPT) was proposed to fabricate micro-dimple arrays on copper surface and it was found that the performance of the surface is improved significantly after LPT.

TL;DR: In this article, the effects of ultrasonic nanocrystalline surface modification (UNSM) technique on the tribological behavior of sintered Cu-based alloy prepared using a powder metallurgy (P/M) technique were investigated using a ball-on-disk reciprocating tribometer against a bearing steel ball under dry and oil-lubricated conditions.

TL;DR: In this article, the nano-scratch behavior of ultra-high molecular weight polyethylene (UHMWPE) reinforced with graphene nanoplatelet (GNP) in varying composition of 0, 0.1, 0.5 and 1.5% is reported.

TL;DR: In this article, the polyimide (PI)/graphene oxide (GO) nanocomposite films were synthesized by situ polymerization and their tribological behaviors under dry friction, pure water lubrication and seawater lubrication were comparatively investigated.

TL;DR: Soot from gasoline turbocharged direct injection (GTDI) engines and diesel engines, from exhaust and extracted from oil, were characterized by XRF, XPS, Raman spectroscopy, HRTEM, and Soxhlet extraction followed by GC-MS Laboratory wear tests with drains and supernatants were also conducted.

TL;DR: In this article, slurry erosion experiments of stainless steel SUS-304 were carried out using new advanced erosion test rig, where the multiphase flows of alumina sand and water were utilized as the erodents.

TL;DR: In this article, the behavior of traction coefficient in line-contact EHL with provision for surface roughness is studied and a method for its prediction is presented, where the statistical elasto-plastic asperity contact model is utilized to determine the traction coefficient with consideration of the free volume properties of the lubricant suitable for a wide range of high pressures and temperatures.

TL;DR: In this paper, the combined influences of viscous heat dissipation and non-Newtonian rheology of lubricant on the performance parameters of micro-textured journal bearing were investigated.

TL;DR: In this paper, the boundary and elastohydrodynamic lubricating behaviour of glycerol and its aqueous solutions are discussed in both rolling and sliding contacts with a view on assessing the use of...

TL;DR: In this article, a high-temperature self-lubricating nickel-alloy based composites with Ag and three amounts of BaF 2 /CaF 2 eutectic were prepared by hot press sintering technique.

TL;DR: In this article, the performance of three different cutting tool materials, namely, PCBN, TiN coated PCBN and mixed aluminum ceramic (Al 2 O 3 +TiC), in the turning of medium hardened D2 tool steel (52 HRC) was analyzed.

TL;DR: In this article, numerical simulations of the ring/liner contact in which the liner exhibits a periodic texture (pockets) are reported, and the authors show that the ring profile determines whether pocketing is beneficial or not.

TL;DR: In this paper, wear maps for both uncoated and coated materials were developed on the basis of tests results, showing that the mild wear regime for the composite coating extended to a higher range of sliding speeds and normal loads, than that for the un-coated steel.

TL;DR: In this paper, a biocompatible ionic liquid, tributyl(methyl)phosphonium diphenylphosphate, P1444DPP (IL1) was investigated as an antiwear additive and compared against Amine Phosphate (AP), one of the commonly used conventional antiwear additives in biodegradable lubricants.

TL;DR: In this article, two-phase mechanical face seals with laser surface texturing (LST) on their end faces were investigated using a test rig with a transparent rotating ring, and the results reveal that LST shows potential in two phase mechanical face sealing, but the LST parameters should be carefully considered.

TL;DR: In this article, the influence of friction modifiers on improving adhesion and surface damage of wheel/rail under low adhesion conditions was investigated and the results indicated that water, oil and leaves are very easy to bring low-adhesion phenomena.

TL;DR: In this article, the adhesion and wear results for CrCN/CrN multilayer coatings are presented, and the coatings were deposited on HS6-5-2 steel substrate using cathodic arc evaporation.

TL;DR: In this article, the effects of the geometry and distribution of microdimples on the frictional behavior of surfaces for applications in automotive engines were investigated, where a square array of microscale circular dimples was selected as the texture pattern.

TL;DR: In this paper, a finite element model for the solution of thermal elastohydrodynamic lubrication in coated circular contacts is presented, which is based on a full-system finite element resolution of the elasthydrodynamic and heat transfer equations.

TL;DR: In this article, the tribological behavior of two ionic liquids (ILs) as neat lubricants for sliding pair stainless steel AISI420 and 100Cr6 under four loads (14, 18, 22 and 26 N) was evaluated.

TL;DR: In this article, film thickness measurements in grease lubricated contacts are presented for different greases, and an empirical model is developed which can reflect this behaviour, which is used to estimate the effective grease viscosity leading to the bearing lubrication parameter kappa.

TL;DR: In this article, the authors investigated the friction properties of micro-textured laser microtextured surfaces and found that the depth and the diameter of the micro-holes have a huge influence in determining the amount of friction reduction at the interface.

TL;DR: In this article, two borate esters, tris (4-dodecylphenyl) borate and 2-(2-(4-modal-phenoxy)-1, 3, 6, 2-dioxazaborocan-6-yl) ethanol, were synthesized and applied as anti-wear and extreme pressure additives in rapeseed oil.