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During the running-in of surfaces a change in roughness takes place. The presented model predicts this change for concentrated contacts using an elasto-plastic contact model based on a semi-analytical-method recently developed. Combining this method with a local coefficient of friction, which is determined using a mechanical threshold on the protective nature of the lubricant, and a strain related...
Friction is a phenomenon that is sometimes desired and sometimes to be avoided. In the past, material development grants have not focused on this task. In this article, we present a new and alternative method of reducing elastomer friction when sliding on different kinds of substrates by inducing hard alumina/silica nanostructures on the elastomer surface. The formation of Al 2 O 3 ...
This paper describes the effects of imposed displacement and initial coating thickness on fretting wear behaviour of a thermally sprayed coating. Initial coating thickness and imposed displacement between two mating components are important parameters affecting durability of a thermally sprayed coating under fretting conditions. Nevertheless, the effects of imposed displacement and coating thickness...
In biomedicine, titanium materials with specific surface textures (for example, those produced using consecutive polishing, sandblasting and acid etching) are widely used to facilitate osseointegration of human/animal tissue with implant surface structures. The surface texture has a critical role on the material's functionality in terms of cellular adhesion and proliferation. However, conventional...
In this work, an investigation has been carried out to study the effects of the choice of substrate material on the tribological performance of TiB 2 –TiC–Al 2 O 3 composite coating developed by laser cladding. The coatings have been deposited employing different laser scan speeds on AISI 1020 mild steel and AISI 304 stainless steel substrates using pre-placed precursor powder...
High levels of friction and wear are problems which currently limit the development of sliding micro-electro-mechanical systems (MEMS) – devices which would otherwise offer significant technological advancement. The current paper focuses on the wear of MEMS silicon surfaces, and specifically looks at the effect of environment and surface preparation on wear behaviour. Included in the study is the...
Rail steel with bainite microstructure was developed to further increase steel hardness for improved durability and wear. Even though bainitic steel has higher bulk hardness, it showed worse wear performance than pearlitic steel, which was attributed to the superior work hardening capabilities of conventional pearlitic steel under severe operating stress conditions. As the effects from the wheel/rail...
The reciprocating sliding friction and wear characteristics of five Si/SiC ceramic composites having different microstructures have been studied. The Si/SiC ceramic composites were prepared using natural materials, such as cotton fiber, wood powder, and jute fiber. The respective polymer composites were made from phenolic resin and then converted into Si/SiC ceramic composites by pyrolysis and liquid...
An asperity profile function has been proposed that describes the isotropic rough surface of a material. The function is parameterized with three new roughness parameters that control the root mean square height, the slope and the curvature of the rough surface, respectively. Unlike the roughness parameters used in the well known Greenwood–Williamson model, the three parameters introduced in this...
In the present article, the dry sliding wear behavior of aluminum matrix nanocomposites containing various amounts of Al 2 O 3 –AlB 12 (5, 10 and 15wt.%) particles was investigated. All specimens were prepared by mechanical milling of Al and Al 2 O 3 –AlB 12 nanocomposite powders, followed by hot pressing. Wear tests were carried out at room temperature...
The paper presents asymptotic modeling of the local contact of crossed elastic cylinders in reciprocating sliding wear under a prescribed constant normal load. The wear contact problem is formulated within the framework of the three-dimensional theory of elasticity in conjunction with Archard's generalized wear equation. It is shown that the asymptotic modeling approach, which maintains the experimentally...
With the objective of experimentally correlating several wear-process parameters, accurately and continuously over the duration of a sliding test, this paper presents a novel test rig as well as experimental results obtained by it. The developed test rig is a rotational one with axes supported on aerostatic bearings. It enables online measurement of normal load, friction force, angular position and...
The tribological behavior of PMMA-grafted-MWCNT nanocomposite coatings that were prepared by applying the direct casting method to aluminum surfaces was investigated. Amino-functionalized MWCNTs were first covalently functionalized with PMMA to introduce the interaction force. The PMMA-g-MWCNT exhibited a higher dispersive capacity in the 6FDA-based polyimide matrix than pure MWCNT composite due to...
Wear behaviors of hardmetal YG8B were examined in detail through a modified wet sand rubber rimmed wheel test system ASTM B611 using drilling fluids (slurries) with three types of coarse angular sands, SiC, Al 2 O 3 and SiO 2 , respectively, and an extremely long sliding distance up to more than 60km was adopted. Under the same condition, the volume loss of hardmetals was positively...
Fretting-corrosion is a material degradation process resulting from the combined action of a corrosive environment and small displacement fretting wear. In this work, the fretting-corrosion behavior of Ti–12.5Mo, Ti–13Nb–13Zr, and Ti–29Nb–13Ta–4.6Zr, β titanium alloys which are candidate biomaterials for joint prostheses was studied in Hank's balanced salt solution. Ti–6Al–4Fe α+β titanium alloy was...
This paper presents the experimental results obtained from the scratching of semicrystalline poly(etheretherketone) (PEEK). Various surface mechanical properties of the PEEK such as the hardness, the friction coefficient, the scratch depth and the prevailing deformation mechanisms are presented in the form of scratching maps, generated as a function of the contact conditions. These scratch maps provide...
Cavitation erosion tests were carried out for plastics, i.e. for epoxy resin, polypropylene, high-density polyethylene and polyamide 66, and the relation between cavitation erosion resistance and the mechanical properties was examined. Cavitation erosion resistance of plastics ranges between half and 30 times that of carbon steel. The cavitation erosion of plastics was caused by fatigue fracture similar...
In an ageing population where individuals demand a pain free and active existence, hip arthroplasty has become one of the most important operations of later life, with developments increasing the longevity of this prosthesis. Accurate assessment of wear is an important way to assess how well hip prostheses perform over time. This paper describes a new protocol to accurately locate and map the wear...
Automotive brake friction materials with four different abrasive particles were investigated. The abrasives used in this study were commercial grade silicon carbide, zircon, quartz and magnesia. For microscopic understanding of friction and wear by abrasive particles in the brake friction material, single-particle scratch tests followed by scratch tests with multiple particles were performed first...
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