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The evolution of surface appearance and the initiation characteristics of fretting fatigue cracks in press-fitted specimens were studied by interrupted rotating–bending fatigue tests. The results show that the distance from each fretting damage zone boundary to the contact edge changes with the number of fatigue cycles, while the wear mechanism remains unchanged. The depth and width of the fretted...
Comparisons between the cavitation erosion (CE) in pure water and cavitation-silt erosion (CSE) in sand suspensions were carried out experimentally on 304 stainless steel. The damage was evaluated by mass loss, scanning electron microscopy, roughness and surface residual stress. The effects of the particles and the sand concentrations on the CSE were analyzed. The results show that cumulative mass...
Poly aryl ether ketone (PAEK) is known as a high performance polymer superior to PEEK (poly ether ether ketone) in many aspects such as temperature stability, tribo-performance etc. Recently few efforts are put to enhance the tribo-potential of PAEK by developing composites containing short fibers of carbon and glass and most favored lubricants such as graphite, PTFE (poly tetrafluoroethylene), hexa...
Nitrile Butadience Rubber (NBR) is widely used in marine water-lubricated stern tube bearings. The sand in water, especially in a river (e.g., Yangtze River), is a key factor affecting the tribological properties and lubrication performance of the rubber stern tube bearings. Studying the wear performance of rubber stern tube bearings under different grain sized sands will provide a guide for rational...
Surface texturing plays a vital role in enhancing the look and feel of modern consumer goods and has recently shown promise as a means of increasing scratch resistance. Unlike smooth surfaces where scratch damage is immediately apparent, the introduction of texture can obscure scratches, making them harder to detect. This work presents a new technique for the automatic detection and characterisation...
Titanium alloys typically do not contain hard inclusion phases typically observed in other metallic alloys. However, the characteristic scoring marks and more distinctive micro- and/or macro-chippings are ubiquitously observed on the flank faces of cutting tools in machining titanium alloys, which is the direct evidence of abrasive wear (hard phase(s) in the microstructure abrading and damaging the...
AISI M2 high speed tool steel is one of the widely used materials in the machining industry. The most common problems of this material are wearing of the cutting edge and adhesion of the work materials to the tool during the machining operations. To overcome these disadvantages, single and duplex surface treatments combining a diffusion process and a thin film ceramic coating are performed. In this...
In the development of internal combustion engines, many attempts have been made to numerically quantify a defect known as folded metal in cylinder bores, due to the detrimental effects these defects cause in terms of friction and wear. Despite recent advances in topography analysis, some questions still remain in terms of what is really considered a folded metal. In this work, in addition to the proposition...
In the EU, PM10 from the wear of disc brakes can contribute up to 50% of the total non-exhaust emissions from road transport. The wear originates from the contact surfaces of the friction material and the disc. One possible way to decrease PM10 emissions is to change the materials of the contact pair in terms of composition and coatings. The wear and particle emissions of three novel friction material...
In the present work, three different scratch tests are compared on their ability to rank the abrasion resistance of low alloy steels for industrial applications where the abrasion play a key role, e.g., in earthmoving, agricultural and mining equipment. The first test involves single pass scratching of pristine surfaces with a relatively large rigid indenter. The second test involves multi-pass scratching...
A mechanical sealing tribosystem based on multilayer microcrystalline/nanocrystalline diamond (MCD/NCD) coatings is proposed. The tribological behaviour was investigated in ring–on–ring self–mated planar contact configuration. Tests were carried out under biodiesel lubrication and pressurized water (2bar) sealing conditions. A 3D optical confocal profilometer was used to obtain for the first time...
The connection between profile grinding of rails, martensite surface layers and crack initiation has been investigated using visual inspection, optical microscopy and 3D X-ray computerized tomography. Newly grinded rails were extracted and found to be covered by a continuous surface layer of martensite with varying thickness formed by the grinding process. Worn R350HT and R200 rails were extracted...
This paper provides a novel magnetic assisted turning mechanism for machining steel alloy specimens by HSS tools. The presented setup reduces air gap on a closed magnetic circuit and applies the magnetic field on both tool and workpiece, simultaneously. The usage of closed magnetic field contributes to using the magnetic field advantages at lower magnetic intensity. Using the design of experiments...
The dry sliding friction and wear behavior of Cu-MoS2 composite pins against bearing steel (AISI 52100) discs were investigated in order to determine the optimal additive content. The MoS2 content ranged from 0–40vol%. The microstructure and composition of the worn surface, wear debris and transfer layer were observed and analyzed in detail to reveal the dominant friction and wear mechanisms. It is...
Direct measurement of wear in IC engine bearings is a tedious activity. Vibration signals are known to carry substantial information about engine condition and correlate well with bearing clearance, but have not been well utilised for wear analysis. This paper presents a new method to simulate wear in IC engine bearings by integrating vibration and wear analysis techniques. Some unique features of...
Solid lubricants (SLs) are known to enhance the tribo-performance of oils significantly. Current work focusses on issue of exploration of combination of SLs in different amounts along with dispersant (Polyisobutylene succinimide −1wt% const.) for possible synergism. Hexagonal boron nitride (hBN) and polytetrafluoroethylene (PTFE) are known as anti-friction, Anti-wear additives. PTFE is also known...
Abrasive wear at high temperature (HT) applications is a serious issue in industry, limiting the lifetime of core components, e.g. in steel- or cement production. In literature abrasive wear is commonly linked to material's hardness, but it is known that microstructure and temperature show also major influence. Current studies also found wear protecting effects by the in-situ formation of mechanically...
Friction and adhesion becomes extremely important at nano and micro length scales, modulating the durability of several nano/micro electromechanical systems (NEMS/MEMS). Bio-mimicking the surface texture of different living organisms has helped improve the tribological performance of many such systems. In this study, we examined the friction and wetting behaviour of textured surfaces derived by mimicking...
The effects of snow temperature, wax molecular chain length and position along the ski on the wear of ski waxes due to friction on snow were analyzed in this work. Wear was induced on a linear snow tribometer positioned inside a cold chamber over a length of 9.35km. Every 850m, the waxed ski bases were analysed using FTIR-spectrometry and contact angle measurements. The deformation of the snow was...
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