Showing papers in "Tribology International in 2016"

TL;DR: In this paper, the authors provide a comparative summary of different modeling techniques for fluid flow, cavitation and micro-hydrodynamic effects for surface texturing, and provide the key findings.

TL;DR: In this paper, chemical, physical, and morphological parameters of nanoparticles were studied through statistical comparison, and the influence of those particles on friction and wear was analyzed, which facilitates the fundamental understanding of lubrication that enables us to design and develop nanolubricants with superior tribological performance.

TL;DR: In this article, the authors have presented the various signal processing methods applied to the fault diagnosis of rolling element bearings with the objective of giving an opportunity to the examiners to decide and select the best possible signal analysis method as well as the excellent defect representative features for future application in the prognostic approaches.

TL;DR: In this article, the authors examined the tribological behavior of the piston ring assembly using nanoparticles as nano-lubricant additives, and the results showed a decrease in the friction coefficient, power losses and wear.

TL;DR: In this article, the effects of the base lubricant with and without nanoparticles on the tribological behavior of magnesium alloy/steel contacts were investigated using a reciprocating sliding ball-on-flat tribometer.

TL;DR: In this article, the authors used six nanofluids, namely, MoS 2, SiO 2, diamond, carbon nanotubes (CNTs), Al 2 O 3, and ZrO 2, to select the kind of nanoparticles with optimum lubrication performance in grinding nickel alloy GH4169.

TL;DR: In this article, the performance of vegetable oil based nanofluids on machining performance during turning of AISI 1040 steel through minimum quantity lubrication (MQL) was investigated.

TL;DR: In this paper, an Electro-hydrostatic-actuator (EHA) based on a novel linear oscillating motor, which permits nanoparticle additives, such as layered graphene and MoS 2, using in hydraulic oil.

TL;DR: In this article, the influence of surface texture on film thickness and friction force was measured simultaneously in a convergent-divergent bearing, under conditions that closely replicate an automotive piston ring-liner conjunction.

TL;DR: In this article, an analytical numerical model was developed to understand the tribological behavior of textured surfaces in mixed lubrication regime, which employed the average flow Reynolds equation and an elasto-plastic contact model, established on the basis of finite element analysis, to calculate the hydrodynamic pressure in full film region and the contact pressure in contact region, respectively.

TL;DR: In this article, the commercially available powder form of alumina (Al 2 O 3 ) and colloidal solution of silver nanoparticles were mixed with water to prepare the nanofluids (NFs) of different concentrations.

TL;DR: In this article, the dry sliding wear behavior of Al 5252 alloy and its composites reinforced with nanometric or micrometric SiC particles is studied, and the dominant wear mechanisms are determined using microstructural characterization, hardness measurement, EDS analysis as well as microscopic studies of wear surfaces and debris.

TL;DR: In this paper, the authors describe how grease knowledge is linked to improved rolling bearing performance and how re-lubrication will enhance the bearing performance, and an outlook on future developments in lubricating greases for rolling bearings is given.

TL;DR: In this article, the friction and wear behavior of ultra-high molecular weight polyethylene (UHMWPE) sliding against TiAl6V4 alloy, against AISI316L austenitic stainless steel and against Al 2 O 3 ceramic under dry and lubricated conditions was investigated.

TL;DR: In this paper, the physicochemical properties (density, viscosity, corrosion, thermogravimetry, and conductivity) and tribological behavior of five phosphonium cation-based ionic liquids (P66614][BEHP), [P 66614][C8C8PO2], [P666 14][NTf2, [P44414][DBS], and [P4442][DEP]) were studied.

TL;DR: In this article, a nanolubricant is formulated using graphene nanoflakes and engine oil meeting API 20W50 SN/CF and API 20 W50 SJ/CF specifications.

TL;DR: In this paper, the influence of incorporation of carbon based nano fillers, namely multi-walled carbon nanotubes and graphene oxide on the tribological behaviour of ultra-high molecular weight polyethylene was investigated in water lubricated sliding contacts.

TL;DR: In this paper, the performance of textured surfaces under starved lubrication was investigated and the effect of the oil trapped in the texture features can be modeled clearly, and the simulation results show that the textured liner can obtain a steady benefit on the tribological properties.

TL;DR: In this article, the relationship between bearing grease composition and rolling-sliding friction in lubricated contacts was examined and two distinct operating regions with markedly different friction behaviour were identified for each grease.

TL;DR: In this paper, an accurate 3D finite element model was developed to predict the tool wear of PVD-TiAlN coated carbide and ceramic inserts in turning of Inconel 625.

TL;DR: In this article, a polyol ester was used as the source of a biolubricant and two different conditions of lubrication were investigated under these test conditions, the wear and friction characteristics of different ester samples were measured and compared, the PE ester had comparable characteristics to the fully formulated lubricant (FFL) in terms of the coefficient of friction (CoF).

TL;DR: In this paper, a simulation approach for journal bearings operating from hydrodynamic to mixed lubrication regime where severe metal-metal contact occurs is presented, and the simulation results in the form of Stribeck curves provide a solid base to prove the isothermal elastohydrodynamic simulation approach.

TL;DR: In this article, the use of tiny copper oxide nanoparticles as EP additives in the synthetic oil, developing nanolubricants with low concentrations of this oxide was reported, and the results showed that it is possible to reduce the friction coefficient and wear using tiny nanoparticle as well as decrease the percentage of CuO addition in lubricating oil.

TL;DR: In this article, a dynamic wear prediction methodology is proposed to investigate the coupling effects between surface wear and dynamics of spur gear systems, which combines a quasi-static wear model and a translational-rotational-coupled nonlinear dynamic model.

TL;DR: In this article, the authors analyzed the influence of the load direction and the phenomenon of wear on rolling contact fatigue crack growth on a UIC60 rail with accurate geometry using FEM.

TL;DR: In this paper, the wear behavior of stir cast Al 6082-SiC-Gr hybrid composites was investigated and compared with its matrix alloy and SiC reinforced composites on pin-on-disc equipment at test conditions of 5-15-N load, 50-75m sliding distance and 200µm grit size.

TL;DR: In this paper, a combination of powder metallurgy, hot rolling and solution treatment has been used to construct aluminum matrix composites with in-situ AlB 2 particles, and the effects of boron content (7 and 12 ¼ ) on the microstructures and mechanical properties of the composites were investigated by means of scanning electron microscopy (SEM), tensile test and micro-hardness measurements.

TL;DR: In this paper, a quasi-dynamic model of ball bearing was proposed and the motions and heat generation obtained via the model were then input to a precise numerical model for cage thermal analysis.

TL;DR: Wear studies of insitu AA5052/ZrB 2 composites show a linear relationship between cumulative wear and sliding distance, whereas, coefficient of friction has fluctuating tendency as mentioned in this paper.

TL;DR: In this paper, the wear behavior of stir cast Al 6082-SiC-Gr hybrid composites was studied and compared with alloy and Al-62 alloy, and the results showed that the wear resistance properties of Al−SiC−Gr composite was better than Alloy and Al•SiC composites.