Published in Tribology Letters
The hydrodynamic lubrication properties of sliding bearings are influenced by the velocity profile under shear. However, at present, there are very few reports on the velocity profile distribution of the fluid film lubrication in conformal contacts. In this article, an apparatus was built for in situ measurement of the velocity profile of thin oil ...
Published in Tribology Letters
We present a cheap, efficient, and non-hazardous protocol for altering the roughness of hard particles at the nanometer-scale using a stone tumbler, a tool which is normally used for polishing stones. Six different textures were achieved by lining the tumbler with sandpaper of mean grit diameters dg=201\documentclass[12pt]{minimal} \usepackage{amsm...
Published in Tribology Letters
This paper presents a numerical analysis of the hydrodynamic pressure build-up between parallel surfaces. According to the Reynolds theory, it is not possible to generate a pressure between flat parallel sliding surfaces. However, experimental results demonstrate that mechanical seal surfaces can be separated by a full fluid film if the sliding spe...
Published in Tribology Letters
Cavitation erosion behavior of 316L was investigated mainly in terms of its microstructural and mechanical factors. The cavitation erosion resistance (Re) was defined with the consideration of evolutionary tendency of the erosion rate. Morphology evolution of the eroded surface was observed by scanning electron microscopy. Early microstructure evol...
Published in Tribology Letters
AbstractIn nano-scale thin film, the lubricant molecular structure may have more significant impact to lubricating performance than in bulk states. In order to investigate the influence of hydrocarbon base oil molecular structure to lubricating properties, three base oil samples with different molecular structure were synthesized in this study, the...
Published in Tribology Letters
The frictional anisotropy of metallic nanoparticles is investigated using a molecular dynamics method. Calculations of anisotropy have been performed for aluminum, palladium, and platinum nanoparticles containing 10,000 atoms. Anisotropy is studied at high sliding velocities of nanoparticles over the graphene surface. The influences of incommensura...
Published in Tribology Letters
The tribo-oxidative wear of a Cu-based metal-matrix composite, dry sliding against a steel counterface, was investigated at 400 °C by means of pin-on-disc sliding tests. The applied pressure was 0.5 and 1 MPa, and the sliding velocity was 1.57 and 7 m/s. Special emphasis was given to the determination of the characteristics of the friction layers, ...
Published in Tribology Letters
Material removal caused by particles impacting is a typical form of particle erosion. Study on single particle impact on metallic surfaces helps to understand the fundamental erosion mechanism comprehensively. In this paper, a new study of single pyramid-shaped particle impact was performed. For experimental study, a catapult device was applied to ...
Published in Tribology Letters
Surface texture affects adhesion, friction and wear. A key component in the studies of these effects is a multiscale and directional characterization of surfaces. However, this task is beyond the ability of standard methods currently used. Methods based on fractal geometry, quantifying the surface topography at individual scales and directions, hav...
Published in Tribology Letters
The influence of a series of Ethomeens (ethoxylated alkylamine organic friction modifiers) on the durability and friction of tribofilms formed by a commercial blend of primary and secondary ZDDP in sliding/rolling contact has been studied. When pre-formed ZDDP tribofilms are rubbed in Ethomeen solution, boundary friction is reduced and some of the ...
