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This paper reviews the work done to understand cavitation damage. The paper covers the theoretical formulation of cavitation bubble collapse and the estimate of bubble collapse pressure, the techniques for measurement of cavitation damage in the laboratory and the special facilities for measurement of cavitation damage in sodium, the instrumentation for measurement of collapse pressure during cavitation...
Although diamondlike carbon coatings like WC/a-C:H have a proven history of tribological performance in many mechanical applications, studies have reported that these coatings can sometimes experience high wear rates when operating in lubricants with large concentrations of phosphorous- and sulfur-based additives. In this study, WC/a-C:H and TiC/a-C:H coatings have been tribologically tested against...
Atomic layer deposited (ALD) alumina is a promising candidate for use as a wear-resistant and protective coating in MEMS and other applications. While the tribological properties of ALD alumina may be affected by numerous factors related to processing, environment, and operating conditions, its wear behavior is neither quantified nor well understood. In this study, ALD alumina is annealed at different...
The tribology of diamond-like carbon (DLC) films has been studied for decades, but their friction and wear mechanisms at the nanoscale still remain unclear due to experimental limitations. To address this challenge, the friction and wear between DLC films and diamond tips are investigated via molecular dynamics simulations. It is found that the load can increase wear rate of the DLC film by inducing...
The object of this paper is to investigate the influence of solid solution strengthening on the spalling behavior of railway wheel steel. White etching layer (WEL) was reproduced by twin-disc test and analyzed by phase transformation kinetic. Spalling of WEL was then evaluated by rolling contact fatigue (RCF) test and finite element analysis. The results show that solid solution strengthening improves...
Contributions of exhaust and non-exhaust sources to traffic-related particulate matter (PM) pollution in the atmosphere are almost identical and the most important non-exhaust source is known to be brake wear particles. In order to understand the properties and harmful effects of wear particles on people, accurate information on size distribution of brake wear particles is needed. Our previous study...
In this study, Ti-6Al-4V dovetail joint specimens which highly simulate the attachment between the blade and disk of fan stages in a certain gas turbine engine were designed and used in fretting fatigue experiments. The fretting wear mechanism was characterized using a bench level experimental method. The effect of shot-peening on both fretting wear mechanism and fretting fatigue property was evaluated...
Over 75% of domestic electric power consumption in Colombia is supplied by hydropower. Abrasive wear is degrading turbine components such as Pelton needle valve nozzles. This problem has been studied on the components themselves (in situ). However, it was necessary reproduce the same hydro-abrasive phenomena in a controlled laboratory environment. This study describes the design and construction of...
Erosion damage is common in many industries and one of the flow components which may experience severe erosion rates is choke geometry. Choke valves in wellhead or well completion may experience such conditions. In the present study, Computational Fluid Dynamic (CFD) was employed to calculate erosion for a choke geometry constructed of aluminum. The Eulerian-Lagrangian approach was utilized for continuous...
Stone tiles used as flooring materials in buildings are subject to three-body abrasion wear due to pedestrian traffic. Hence, wear resistance characterization of stone materials is an important issue in civil engineering projects for appropriate selection and design of floor coverings. The objective of the present work was to identify the most influential quantitative petrographic properties of granites...
When a rotor operates in very low rotating speeds, the fluid-film in hydrodynamic bearings is not completely formed, which allows direct metal to metal contact between the bearing and the journal. Numerous start/stop cycles also may lead to bearing wear. In this context, the present work aims to evaluate a model-based method for identification of hydrodynamic bearing wear parameters: more specifically,...
Although polyamide 6 (PA6) obtained from ε-caprolactame (CL) is an engineering polymer with outstanding properties used in sliding applications, it exhibits low impact strength and high water absorption. Those are some of the reasons why copolymerization between CL and laurolactame (LL) is desired. In this work, copolymers from 0–100wt% LL are prepared to evaluate crystallinity, melting behavior,...
It is demonstrated that the wear of poly(ether-ether-ketone) (PEEK) composite coatings can be improved by depositing them in the presence of a magnetic field. In this investigation, particles of PEEK were deposited on a low-carbon steel substrate by thermal spray coating under a magnetic field causing them to become aligned. Friction and wear behavior of the coatings, including crystallization level...
The objective of this research was to determine the influence of applying a hybrid treatment, consisting of fine particle bombardment (FPB) and powder impact plating (PIP), on the scuffing behavior of ductile cast iron. Ductile cast iron samples were processed by an FPB treatment, a PIP treatment, and a hybrid treatment of both FPB and PIP. Scuffing behavior of these samples was investigated using...
Surface texturing to control friction and wear has been the focus of numerous studies in the last few decades. Despite this interest, understanding the underlying causes for surface texturing effects under different contact and lubrication conditions remains a subject of continuing controversy. Although there has been progress in the fabrication of precise surface textures and modeling of their influence...
A review of the superhydrophobicity of engineering surfaces with particular emphasis on the effect of friction and wear on the wetting characteristics is presented. Different theoretical aspects, experimental practices, and numerical modeling techniques are discussed. The problem of stability and durability of superhydrophobic surfaces from both theoretical and practical points of view is emphasized...
Green ceramics are the ceramic compacts before sintering, and there is no metallurgical bonding force between the powder particles. Therefore, it can be machined by traditional mechanical processing. Machining of green ceramics represents an alternative way to other shaping process, and offers a high degree of flexibility and economic efficiency for the machining of ceramic parts. In this paper, surface...
This study presents analysis of tool wear of P25 cemented carbide inserts in finish turning of AISI 1045 carbon steel for different cooling conditions: dry cutting, minimum quantity cooling-lubrication (MQCL) and MQCL with phosphate ester-based EP/AW additive. It was proven that the wear of the inserts using MQCL + EP/AW method is reduced by about 40% compared to dry cutting and about 25% compared...
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