Showing papers in "Tribology International in 2011"

TL;DR: In this paper, the potency of MQL palm oil (MQLPO) as a lubricant in the high speed drilling of Ti-6Al-4V was studied and it was found that palm oil can be used as a viable alternative to synthetic ester for MQL lubricant.

TL;DR: In this article, a numerical model is used to analyze the cylindrical texture shape effect on the characteristics of a hydrodynamic journal bearing and the theoretical results show that the most important characteristics can be improved through an appropriate arrangement of the textured area on the contact surface.

TL;DR: In this paper, a review of the literature on wear and lubrication models of hip prostheses is presented, stressing simplifying hypotheses, input data, methods and results, and pointed out that actually lubrication and wear are described neglecting each other while new advanced models including both aspects could be helpful.

TL;DR: In this article, a series of experiments were conducted to examine the frictional characteristics of laser surface-textured, heat-treated 17-4 PH stainless steel specimens and two dimple shapes were tested: circular and elliptical.

TL;DR: In this article, a series of copper and graphite hybrid composites are fabricated through a novel microwave processing technique, which is used to evaluate their tribological properties under testing parameters of normal loads 12−48 n and sliding speed of 1.25−2.51 m/s.

TL;DR: In this paper, the orientation effects of micro-grooves on the friction performance of sliding surfaces were investigated and the results were discussed from the aspects of hydrodynamic effect, lubricant supply effect and contact stress effect.

TL;DR: In this paper, a high throughput inductive pulse sensor based on inductive Coulter counting principle for detecting metallic wear debris in lubrication oil is presented, which detects the passage of metallic debris by monitoring the inductance change of a two-layer planar coil with a meso-scale fluidic pipe crossing its center, which is designed to attain high throughput without sacrificing the sensitivity.

TL;DR: In this paper, experimental studies on the performances of both developed environmental friendly vegetable based cutting fluids (refined sunflower and canola oils) including different percentage of extreme pressure additive and two commercial cutting fluids in turning processes were reported in this work.

TL;DR: In this paper, the effect of nanoparticles on the tribological behavior of serpentine powders (SPs) suspended in diesel oil was investigated, and it was shown that the optimum mass ratio of NPs to SPs is 7.5:92.

TL;DR: In this paper, the authors reviewed the wear properties of tangential, radial, torsional, and rotational fretting wear modes, e.g. tangential fretting, and showed that the properties of these modes are similar to those obtained from the classic fretting modes.

TL;DR: In this paper, the frequency analysis of signals characterizing surface scanning is carried out to investigate the vibration spectrum measured on the finger and to highlight the changes shown in the vibration spectra as a function of characteristic contact parameters such as scanning speed, roughness and surface texture.

TL;DR: In this article, the influence of initial surface roughness on friction and wear processes under fretting conditions was investigated experimentally, and the effect of rough surfaces on wear activation energy was observed.

TL;DR: Finger friction measurements performed on a series of printing papers are evaluated to determine representativeness of a single individual as discussed by the authors, and results show occasionally large variations in friction co-...

TL;DR: A review of the literature on the numerical tribology of dry contacts by analysing the different scales involved can be found in this article, where the authors propose an exhibition of numerical results.

TL;DR: In this paper, the scratch damage features were characterized using laser confocal and scanning electron microscope using various high performance polymers, including polybenzimidazole (PBI), polyparaphenylene (PPP), polyetheretherketone (PEEK), and polyimide (PI).

TL;DR: The mechanism of the triblogical property improvement by the laser surface texturing was discussed based on the experiment results and the surface analytical results in this paper, where the surface laser texturing showed the friction reducing effect under the sliding condition of the low bearing characteristic number.

TL;DR: In this article, the influence of the addition of 25 nm carbon-coated copper nanoparticles on the tribological behavior of a polyalphaolefin (PAO6) was investigated.

TL;DR: In this article, the authors compared the behavior with ZDDP of six different diamond-like carbon coatings (DLCs) for improving friction and wear resistance of engine parts.

TL;DR: In this article, a finite element analysis is proposed to study the influence of wall slip over the load carrying capacity and power loss in hydrodynamic fluid bearings, and a significant number of numerical simulations show that wall slip conditions lead to better power loss improvements.

TL;DR: In this paper, the possibility of adhesion/cohesion bond strength evaluation of thick plasma spray coatings with scratch tester, according to the ISO working draft (ISO/WD 27307), was analyzed and compared with the standard test method (ASTM C 633).

TL;DR: In this paper, an experimental study was carried out to investigate the tribological performance of different laser surface texture patterns, with unpolished material bulges around the dimples, under realistic operating conditions of starved lubrication, for use in airconditioning and refrigeration compressors.

TL;DR: In this article, the running-in and steady-state wear in the mixed-EHL line contact problem are analytically and experimentally studied, and an experimental apparatus is designed and built to investigate the transient wear process during the initial stage of contact of two rollers with fresh surfaces as well as the contact of broken-in surfaces, when wear rate becomes steady.

TL;DR: In this paper, a finite element model of the interaction of an elastic-plastic asperity junction based on cylindrical or spherical asperities is used to predict sliding friction coefficients.

TL;DR: In this paper, the tribological behavior of PVD coated Ti-6Al-4V was studied by a flat-on-cylinder tribometer (load range 30-60 N).

TL;DR: In this paper, aerostatic annular thrust bearings with feedholes of less than 0.05mm in diameter are considered, and the static and dynamic characteristics of these bearings are investigated experimentally and numerically.

TL;DR: In dry sliding wear of H13 steel, with increasing ambient temperature and load, the wear mechansim changed from adhesive wear to mild wear and finally to oxidative wear.

TL;DR: In this paper, the corrosion and tribological behavior of an as-cast High Carbon CoCrMo alloy subjected to different thermal treatments in simulated body fluids has been analyzed by electrochemical techniques.

TL;DR: In this paper, a dual ion beam system was used in conjunction with progressive load nano-scratch testing and nanoindentation to investigate film behaviour in highly loaded sliding and mechanical properties.

TL;DR: In this paper, the authors provide an overview of the results of these studies and also draw several general conclusions on the behavior of a plain journal bearing during start-up, including bearing characteristics influencing the friction coefficient (surface roughness and bearing materials).

TL;DR: In this paper, the authors used a modified slurry pot erosion tester to perform in-situ electrochemical measurements during solid particle impingement to investigate the effects of velocity, sand size and sand concentration on a passive metal (UNS S31603).