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A methodology is introduced where principal component analysis (PCA) and fractal profile description are combined for characterizing and modelling computational rough surfaces for their use in computer-aided-engineering (CAE) processes. The main idea is to extract principal profiles (PPs) from digital surfaces acquired using confocal microscopy and to model the projection of the original surface onto...
The effect of molecular weight (MW) of a polymer on the wettability of fibers and its influence on the performance properties need to be addressed in detail. Specialty polymer, viz. polyethersulphone (PES), with varying MW was selected as a matrix material to develop the composites with carbon fabric (CF). Since carbon fiber is inert towards the matrix, cold remote nitrogen–oxygen plasma (CRNOP) treatment...
Tribological behaviour of ZrN coatings deposited on titanium modified austenitic stainless steel (alloy D-9) substrates is investigated. The coatings were deposited in the deposition temperature range 300–873K using the pulsed magnetron sputtering technique. A comparative tribological study was performed with steel and ceramic balls such as alumina and silicon nitride to evaluate frictional properties...
Hydroturbine components generally suffer from severe wear due to slurry erosion caused by solid particles entrained in the flowing water. High-velocity oxy-fuel (HVOF) spray process is known for depositing protective coatings on the materials. In this work, WC–10Co–4Cr and Al 2 O 3 +13TiO 2 coatings were deposited on CF8M turbine steel by HVOF spray process and studied with...
This paper presents a methodology for the modelling of the variability of brake linings. The impact of the contact surface topography on thermal and braking noise issues is well known but the behaviour of its variability is still barely studied. We propose to introduce it in finite element models using stochastic processes (e.g. random variables and random fields). Therefore, the surfaces of pads...
In this paper, the effect of pv factor on the tribological behavior of a copper-impregnated metallized carbon brush sliding against a CuCrZr ring was investigated. Friction and wear tests were conducted on a brush-on-slip ring type wear tester. The tests were performed at two electrical currents (0 and 20A) and seven different combinations of contact pressure (p) and sliding velocity (v), herein...
Under certain conditions, the metals of some heavily loaded tribological units may slide against each other without the benefit of lubrication. In such cases, the heat or electrical conduction properties of the sliding materials are particularly important. Copper-based materials are relevant for such application. In this study, we investigated the wear and friction that occurs between copper-based...
A population growth model (PGM) is introduced to simulate wear during running-in, which is one of three typical wear states. The rough contact region is divided into several bar-shaped elements while the wear of every grid point has been considered as a PGM process. The wear volume in rough surface can be calculated during the wear processes and the proposed wear formula contains three items: initial...
In this study, the erosion of Ti(C, N)-based cermets with varying Mo 2 C content was tested in a slurry solution containing 5wt% H 2 SO 4 and 5wt% Al 2 O 3 particles. Erosion and corrosion of the cermet causes the removal of the Ni binder to occur, exposing the Ti(C, N) grains as well as the microcracks, carbide particle fracture, debonding of particles and...
This study has a specific focus on the tribological characteristics of the tribopair, which consists of high velocity oxy-fuel (HVOF) spraying WC–10Co–4Cr coating and sintering Si 3 N 4 with 5% SiC whisker, lubricated under the silt-laden water. The friction coefficient and abrasive wear rate were measured to evaluate the friction and wear characteristics under a range of test conditions,...
Multi-energy X-ray spectra were acquired on friction films formed on semi-metallic brake pads rubbed against grey cast iron discs in friction tests at low and high speed, performed in a full scale bench dynamometer. The amount of X-rays generated with electrons in the same energy range as in the experimental measurements was calculated with Monte Carlo simulations performed with CASINO software, on...
In a ball-on-disc wear test, an alumina ceramic body sliding against a silicon nitride ceramic body in water achieved an ultra-low friction coefficient (ULFC) of 0.004. The profilometer and EDX measurements indicated that the ULFC regime in this unmated Al 2 O 3 –Si 3 N 4 pair was achieved because of the formation of a flat and smooth interface of nanometric roughness,...
In the present study the sliding wear behavior of pulse electrodeposited nanocrystalline Ni coatings as a function of grain size including bulk annealed Ni has been systematically studied using pin-on-disc configuration against the WC-Co counter body. The sliding wear has been analyzed with respect to wear rate, coefficient of friction, subsurface deformation and composition of wear debris. The result...
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