Showing papers in "Tribology International in 2019"

TL;DR: In this article, the dispersing mechanism of different surfactants and evaluated the dispersion stability and tribological performances of PPO-based CNT nanofluids were analyzed. And different experimental evaluations confirm that APE-10 is the optimal dispersant of CNT nanoparticles.

TL;DR: In this article, the authors provide a short overview of the energy efficiency and environmental impacts of current transportation, industrial, and residential systems and how much of that efficiency is adversely affected by friction and wear losses in moving mechanical parts and components.

TL;DR: In this article, a review on the current research developments in high temperature solid-lubricating materials is provided, including design strategies of a low friction coefficient, a high wear resistance, and a wide environment range.

TL;DR: In this paper, the authors focused on the development of nano-MQL by adding hBN nanoparticles compared to pure MQL and dry machining in turning of Inconel 625.

TL;DR: In this article, a literature review about the current state and future improvement trends for optimization of critical tribological components used in passenger electric vehicles is presented, which gives an understanding of the most recent achievements in terms of tribological solutions applied to the critical components and the identification of research gaps for further developments and efficiency improvements for EVs through novel component designs, materials and lubricant technologies.

TL;DR: In this article, the effects of eco-friendly cutting conditions on machining performance in the milling of Inconel X-750 superalloy were investigated, and the best results on all performance characteristics were obtained under nanofluid cutting conditions.

TL;DR: In this paper, the influence of silane solution concentration on mechanical, tribological and morphological properties of corn stalk fiber (CSF) reinforced polymer composites was investigated, and the results showed that the silane-treated CSF reinforced polymer composite exhibited a promising property of low density.

TL;DR: In this paper, the frictional behavior of plane converging bearings was experimentally and numerically studied for four texture geometries fabricated by ultra-short pulse laser texturing (single pocket, line, cross-and dot-like texture) and convergence ratios under full-film lubrication in the presence of thick oil films (up to 100μm).

TL;DR: In this article, the effect of some cooling conditions on machinability of tool wear, tool-chip interface temperature, and surface roughness were evaluated in terms of machining performance.

TL;DR: A review of the state-of-the-art in aerostatic bearing research and development with the emphasis on analytical and computational approaches for design and optimization of bearing performance is presented in this paper.

TL;DR: In this paper, a misaligned thermohydrodynamic (THD) model considering turbulent-flow was presented to predict the performance of water-lubricated hydrodynamic journal bearing (WHJB).

TL;DR: In this article, a series of analysis technologies were utilized to characterize the morphology, structure and components of Fe3O4@C microspheres, and the results showed that the carbon layer with the thickness of about 17 nm is decorated on the surface of Fe 3O4.

TL;DR: In this article, the authors provide an overview of such alterations, their properties, formation mechanisms and impact on bearing failure, as well as how operating conditions such as pressure, temperature and running time impact them during RCF.

TL;DR: In this article, the authors present a state-of-the-art survey on the development of the foil bearing technology and present a number of inherent challenges in their designs, analyses and performance characteristics that must be taken into consideration for proper functionality and safe operation.

TL;DR: In this paper, a novel polyimide (PI) nanocomposites that possess outstanding strength and high tribological performance were fabricated using different contents of amine-functionalized graphene nanosheets (AGNS) via in-situ polymerization.

TL;DR: In this paper, the friction and wear maps of copper matrix composites with different Fe content, tribo-evaluated with different braking energy density (BED) against a steel counterpart, were constructed.

TL;DR: In this paper, a detailed comparison of 3D surface topography in terms of amplitude, spatial, hybrid, functional, and volume parameters was analyzed under various tool wear stages and the undesirable surface defects, such as feed marks, plowing grooves, side flow, plastic flow, and adhered material particles, surface tearing, surface burning, scratch marks were discussed on the basis of tool wear patterns and additional thermo-mechanical loads.

TL;DR: In this paper, the effects of fretting wear on frictional contacts were investigated using a high frequency friction rig to measure the evolution of hysteresis loops, friction coefficient and tangential contact stiffness over time.

TL;DR: In this paper, the effect of critical operating conditions, such as load, environmental pressure and temperature at different lubrication regimes, on polymer tribological performance was investigated. And the ability to develop a transfer film on the countersurface was determined as a key factor in polymer tribology performance.

TL;DR: In this paper, the carbide dissolution and precipitation of M50 bearing steel were investigated as a function of cold rolling reduction and it was observed that prior cold rolling not only enhances the dissolution of primary carbides, but also contributes to carbide precipitation.

TL;DR: In this paper, the tool wear mechanisms and micro-channels quality were investigated using the Ti(C7N3)-based cermet micro-mills in machining Ti-6Al-4V alloy.

TL;DR: In this article, a simple method to generate surface topography is presented, where the power spectrum and the height probability distribution can be specified independently, and the main advantage of the presented method as compared with those available in the literature is that the surface topology can be inferred independently.

TL;DR: In this article, a transient Mixed Lubrication-Wear coupling model (MLW coupling model) is developed to investigate the mixed lubrication and wear performances of journal bearings, and a wear experiment for journal bearing is performed to support the validity of the developed numerical model.

TL;DR: In this paper, the tribological properties of nanolubricants dispersed with dodecylamine functionalized graphene (DAG) in commercial engine oil were investigated and shown to reduce the coefficient of friction (COF) by a maximum ∼40%.

TL;DR: In this article, the influence coefficient method (ICM) was proposed to evaluate the elastic deformation, and the elastic-hydrodynamic lubrication (EHL) model of the water-lubricated micro-groove bearings was developed.

TL;DR: In this article, it was shown that the film thickness depends on speed, load and temperature and on the grease properties, such as the base oil viscosity, but not only on the base viscoverage but also on other grease properties.

TL;DR: In this paper, a novel lubricant has been developed by using graphene oxide and nanodiamond (ND) together as lubricant additives in water in order to enhance the tribological performance.

TL;DR: In this paper, the authors identify the characteristic parameters, such as the sliding velocity, Hersey number, and friction torque or friction coefficient, when the transition of lubrication regimes occurs for different journal bearing types.

TL;DR: In this article, the specific strength of Al-15%CSA alloy composite is enhanced by 70% over Al-1100 base alloy, while the coefficient of friction initially increases up to 6'N/mm2 and then decreases due to the presence of oxides in debris, which are liberated from tribo surfaces.

TL;DR: In this paper, the effect of the pulse-current on the wear behavior of Ni/nSiC and Ni/μSiC electrodeposits was investigated by means of microstructural, crystallographic e chemical analysis.