Surface Topography Modelling for Reduced Friction

Sedlaček, Marko; Vilhena, Luís; Podgornik, Bojan; Vižintin, J.

doi:10.5545/sv-jme.2010.140

Cited by 80 publications

(66 citation statements)

References 15 publications

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“…In the literature, it is stated that skewness and kurtosis could be used to estimate the corrosion resistance and friction performance of a surface [34,35]. Sedlacek et al reported that a more negative skewness and a high kurtosis imply a low friction performance under dry sliding, due to the deep valleys, which act as wear particle traps [34].…”

Section: Morphologymentioning

confidence: 99%

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

et al. 2017

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Abstract:This study aims to analyze hydroxyapatite (HAP) coatings enriched with Mg and Ti prepared by a magnetron sputtering technique on Ti6Al4V substrate. For preparation of the coatings, three magnetron targets (HAP, MgO and TiO 2 ) were simultaneously co-worked. The concentration of Mg added was varied by modifying the power applied to the MgO target. In all coatings, the Ti concentration was maintained constant by keeping the same cathode power fed during the whole deposition. The influence of different Mg dopant contents on the formation of phase, microstructure and morphology of the obtained Ti-doped HAP coatings were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Moreover, the effects of Mg addition upon corrosion, mechanical and biological properties were also investigated. Mg-and Ti-doped HAP coating obtained at low radio-frequency (RF) power fed to the MgO target provided material with high corrosion resistance compared to other coatings and bare alloy. A slight decrease in hardness of the coatings was found after the Mg addition, from 8.8 to 5.7 GPa. Also, the values of elastic modulus were decreased from 87 to 53 GPa, this being an advantage for biomedical applications. The coatings with low Mg concentration proved to have good deformation to yielding and higher plastic properties. Biological test results showed that the novel surfaces exhibited excellent properties for the adhesion and growth of bone cells. Moreover, early adherent vital cell numbers were significantly higher on both coatings compared to Ti6Al4V, suggesting that Mg ions may accelerate initial osteoblast adhesion and proliferation.

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Section: Morphologymentioning

confidence: 99%

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

et al. 2017

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“…Friction is an important parameter considered during composite forming processes [1][2][3][4][5][6][7][8] as the limitations imposed by friction at tool-part interaction can play a role in the development of certain processing outcomes such as residual stresses and subsequent spring-in and warpage of the part, as well as surface cracks. These outcomes in turn can have a direct effect on the mechanical performance of manufactured components, or their ability to be assembled due to residual strains.…”

Section: Introductionmentioning

confidence: 99%

“…The study parameters included the type of mould material, mould surface roughness (mean average roughness, R a ), mould surface preparation (use of release agent), moulding temperature, as well as applied pressure on the system. Roughness was selected as a parameter, as it is known surface morphological parameters can have a direct correlation to friction [8]; understandably, the rougher a mould surface, the higher the resistance to displace an object on it. As surface roughness contributes to friction, surface preparation also plays a role hand in hand in reducing or increasing frictional forces.…”

Section: Introductionmentioning

confidence: 99%

On Static and Dynamic Friction Characterization of Tool-Fiber Interaction: Effect of Mould Type and Processing Conditions

AS¹

2017

MOJPS

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Frictional interaction of tool and part during composite manufacturing is critical as it can affect a range of processing outcomes such as residual stress during the shrinkage of resin, formation of wrinkles at the tool side, possibility of surface cracks during de-moulding, among others. This article, through a systematic design of experiments (DOE) methodology, investigates how different processing configurations can affect the static and dynamic coefficients of friction at the mould-fiber interface. The study factors chosen are the type of mould material, mould surface roughness, mould surface preparation (use of release agent), temperature, and the applied pressure. The mould materials employed include a Glass Fiber Reinforced Polymer (GFRP) as well as a stainless steel, interacting with a set of unidirectional fibreglass tows. Results indicate to what extent each of the above design and processing factors can have a statistical effect on the level of dry friction between the tool and fiber tow, both at static and dynamic states.

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“…An enhanced friction modeling for steady-state rolling tires is submitted by Rene van der Steen [5]. Surface topography modeling for reduced friction is provided by Sedlacek et al [6]. The modified Maxwell-slip model of presliding friction is presented by Runderman and Bertman [7].…”

Section: Introductionmentioning

confidence: 99%