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M. Lubwama - One of the best experts on this subject based on the ideXlab platform.
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flexibility and Frictional Behaviour of dlc and si dlc films deposited on nitrile rubber
Surface & Coatings Technology, 2014Co-Authors: M. Lubwama, J. B. Kirabira, A. Sebbit, Brian Corcoran, Kevin Mcdonnell, Denis P Dowling, K. SayersAbstract:Abstract The flexibility and Frictional Behaviour of DLC and Si-DLC films with and without Si–C interlayers were studied in this paper. The films were deposited onto nitrile rubber using a combination of a closed field unbalanced magnetron sputtering ion plating system and plasma enhanced chemical vapour deposition in Ar/C 4 H 10 plasma. Flex tests were used to determine the film flexibility. The Frictional and wear characteristics of these films were investigated using a pin-on-disc tribometer for applied loads of 1 N and 5 N under conditions of dry and wet sliding with a stainless steel counterpart. The induced temperature rise during tribo-testing was used to determine the effect of Frictional heating on the Frictional Behaviour of these films. Lateral cracking was observed for DLC film and Si-DLC film with and without Si–C interlayer after flex tests. More de-bonding was observed for Si-DLC film. The films generally showed excellent Frictional results for dry sliding under a normal load of 1 N and for wet sliding under normal loads of 1 N and 5 N. The improved film flexibility was related to enhanced adhesion as a result of the Si–C interlayer. Frictional heating was significant for tribo-testing performed under a normal load of 5 N under dry sliding conditions. The induced surface temperature suggests that the influence of Frictional heating of the structural transformation taking place within the wear track is minimal compared to the formation of wear debris.
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Flexibility and Frictional Behaviour of DLC and Si-DLC films deposited on nitrile rubber
Surface and Coatings Technology, 2014Co-Authors: M. Lubwama, D Dowling, J. B. Kirabira, A. Sebbit, Brian Corcoran, Kevin A. Mcdonnell, K. SayersAbstract:The flexibility and Frictional Behaviour of DLC and Si-DLC films with and without Si-C interlayers were studied in this paper. The films were deposited onto nitrile rubber using a combination of a closed field unbalanced magnetron sputtering ion plating system and plasma enhanced chemical vapour deposition in Ar/C4H10 plasma. Flex tests were used to determine the film flexibility. The Frictional and wear characteristics of these films were investigated using a pin-on-disc tribometer for applied loads of 1N and 5N under conditions of dry and wet sliding with a stainless steel counterpart. The induced temperature rise during tribo-testing was used to determine the effect of Frictional heating on the Frictional Behaviour of these films. Lateral cracking was observed for DLC film and Si-DLC film with and without Si-C interlayer after flex tests. More de-bonding was observed for Si-DLC film. The films generally showed excellent Frictional results for dry sliding under a normal load of 1N and for wet sliding under normal loads of 1N and 5N. The improved film flexibility was related to enhanced adhesion as a result of the Si-C interlayer. Frictional heating was significant for tribo-testing performed under a normal load of 5N under dry sliding conditions. The induced surface temperature suggests that the influence of Frictional heating of the structural transformation taking place within the wear track is minimal compared to the formation of wear debris. © 2013 Elsevier B.V.
K. Sayers - One of the best experts on this subject based on the ideXlab platform.
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flexibility and Frictional Behaviour of dlc and si dlc films deposited on nitrile rubber
Surface & Coatings Technology, 2014Co-Authors: M. Lubwama, J. B. Kirabira, A. Sebbit, Brian Corcoran, Kevin Mcdonnell, Denis P Dowling, K. SayersAbstract:Abstract The flexibility and Frictional Behaviour of DLC and Si-DLC films with and without Si–C interlayers were studied in this paper. The films were deposited onto nitrile rubber using a combination of a closed field unbalanced magnetron sputtering ion plating system and plasma enhanced chemical vapour deposition in Ar/C 4 H 10 plasma. Flex tests were used to determine the film flexibility. The Frictional and wear characteristics of these films were investigated using a pin-on-disc tribometer for applied loads of 1 N and 5 N under conditions of dry and wet sliding with a stainless steel counterpart. The induced temperature rise during tribo-testing was used to determine the effect of Frictional heating on the Frictional Behaviour of these films. Lateral cracking was observed for DLC film and Si-DLC film with and without Si–C interlayer after flex tests. More de-bonding was observed for Si-DLC film. The films generally showed excellent Frictional results for dry sliding under a normal load of 1 N and for wet sliding under normal loads of 1 N and 5 N. The improved film flexibility was related to enhanced adhesion as a result of the Si–C interlayer. Frictional heating was significant for tribo-testing performed under a normal load of 5 N under dry sliding conditions. The induced surface temperature suggests that the influence of Frictional heating of the structural transformation taking place within the wear track is minimal compared to the formation of wear debris.
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Flexibility and Frictional Behaviour of DLC and Si-DLC films deposited on nitrile rubber
Surface and Coatings Technology, 2014Co-Authors: M. Lubwama, D Dowling, J. B. Kirabira, A. Sebbit, Brian Corcoran, Kevin A. Mcdonnell, K. SayersAbstract:The flexibility and Frictional Behaviour of DLC and Si-DLC films with and without Si-C interlayers were studied in this paper. The films were deposited onto nitrile rubber using a combination of a closed field unbalanced magnetron sputtering ion plating system and plasma enhanced chemical vapour deposition in Ar/C4H10 plasma. Flex tests were used to determine the film flexibility. The Frictional and wear characteristics of these films were investigated using a pin-on-disc tribometer for applied loads of 1N and 5N under conditions of dry and wet sliding with a stainless steel counterpart. The induced temperature rise during tribo-testing was used to determine the effect of Frictional heating on the Frictional Behaviour of these films. Lateral cracking was observed for DLC film and Si-DLC film with and without Si-C interlayer after flex tests. More de-bonding was observed for Si-DLC film. The films generally showed excellent Frictional results for dry sliding under a normal load of 1N and for wet sliding under normal loads of 1N and 5N. The improved film flexibility was related to enhanced adhesion as a result of the Si-C interlayer. Frictional heating was significant for tribo-testing performed under a normal load of 5N under dry sliding conditions. The induced surface temperature suggests that the influence of Frictional heating of the structural transformation taking place within the wear track is minimal compared to the formation of wear debris. © 2013 Elsevier B.V.
E. Van Der Heide - One of the best experts on this subject based on the ideXlab platform.
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variables influencing the Frictional Behaviour of in vivo human skin
Journal of The Mechanical Behavior of Biomedical Materials, 2013Co-Authors: N.k. Veijgen, Marc Arthur Masen, E. Van Der HeideAbstract:In the past decades, skin friction research has focused on determining which variables are important to affect the Frictional Behaviour of in vivo human skin. Until now, there is still limited knowledge on these variables.This study has used a large dataset to identify the effect of variables on the human skin, subject characteristics and environmental conditions on skin friction. The data are obtained on 50 subjects (34 males and 16 females). Friction measurements represent the friction between in vivo human skin and an aluminium sample, assessed on three anatomical locations.The coefficient of friction increased significantly (p<0.05) with increasing age, increasing ambient temperature and increasing relative air humidity. A significant inversely proportional relationship was found between friction and both the amount of hair present on the skin and the height of the subject. Other outcome variables in this study were the hydration of the skin and the skin temperature. © 2013 Elsevier Ltd.
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a multivariable model for predicting the Frictional Behaviour and hydration of the human skin
Skin Research and Technology, 2013Co-Authors: N.k. Veijgen, E. Van Der Heide, Marc Arthur MasenAbstract:Background: The Frictional characteristics of skin-object interactions are important when handling objects, in the assessment of perception and comfort of products and materials and in the origins and prevention of skin injuries. In this study, based on statistical methods, a quantitative model is developed that describes the friction Behaviour of human skin as a function of the subject characteristics, contact conditions, the properties of the counter material as well as environmental conditions. Aims: Although the Frictional Behaviour of human skin is a multivariable problem, in literature the variables that are associated with skin friction have been studied using univariable methods. In this work, multivariable models for the static and dynamic coefficients of friction as well as for the hydration of the skin are presented. Materials & Methods: A total of 634 skin-friction measurements were performed using a recently developed tribometer. Using a statistical analysis, previously defined potential influential variables were linked to the static and dynamic coefficient of friction and to the hydration of the skin, resulting in three predictive quantitative models that descibe the friction Behaviour and the hydration of human skin respectively. Results and Discussion: Increased dynamic coefficients of friction were obtained from older subjects, on the index finger, with materials with a higher surface energy at higher room temperatures, whereas lower dynamic coefficients of friction were obtained at lower skin temperatures, on the temple with rougher contact materials. The static coefficient of friction increased with higher skin hydration, increasing age, on the index finger, with materials with a higher surface energy and at higher ambient temperatures. The hydration of the skin was associated with the skin temperature, anatomical location, presence of hair on the skin and the relative air humidity. Conclusion: Predictive models have been derived for the static and dynamic coefficient of friction using a multivariable approach. These two coefficients of friction show a strong correlation. Consequently the two multivariable models resemble, with the static coefficient of friction being on average 18% lower than the dynamic coefficient of friction. The multivariable models in this study can be used to describe the data set that was the basis for this study. Care should be taken when generalising these results. © 2013 John Wiley & Sons A/S.
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Variables influencing the Frictional Behaviour of in vivo human skin
Journal of The Mechanical Behavior of Biomedical Materials, 2013Co-Authors: N.k. Veijgen, Marc Arthur Masen, E. Van Der HeideAbstract:In the past decades, skin friction research has focused on determining which variables are important to affect the Frictional Behaviour of in vivo human skin. Until now, there is still limited knowledge on these variables.This study has used a large dataset to identify the effect of variables on the human skin, subject characteristics and environmental conditions on skin friction. The data are obtained on 50 subjects (34 males and 16 females). Friction measurements represent the friction between in vivo human skin and an aluminium sample, assessed on three anatomical locations.The coefficient of friction increased significantly (p
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a novel approach to measuring the Frictional Behaviour of human skin in vivo
Tribology International, 2012Co-Authors: N.k. Veijgen, Marc Arthur Masen, E. Van Der HeideAbstract:Abstract Friction involving human skin plays a key role in human life. The availability of a portable tribometer improves the accessibility to large number of both subjects and anatomical sites. This is the first mobile device suitable to measure skin friction with a controlled and variable normal load (range 0.5–2 N) and velocity (range 1–10 mm/s) of a material of choice making a sliding rotational movement over the skin. The results of a pilot study, using stainless steel samples on the ventral forearm compare to results in the literature. The new device can be used for more extensive research to found these results and determine the effects of normal load or sliding velocity on the skin's Frictional Behaviour.
Remko Akkerman - One of the best experts on this subject based on the ideXlab platform.
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Frictional Behaviour of high performance fibrous tows: A contact mechanics model of tow–metal friction
Wear, 2013Co-Authors: Bo Cornelissen, Bert Rietman, M B De Rooij, Remko AkkermanAbstract:Composites forming processes involve mechanical interactions on the ply, tow, and filament level. The deformations that occur during forming processes are governed by friction between tows and tooling material on the mesoscopic level and consequently between filaments and a counterface on the microscopic level. A thorough understanding of the Frictional properties on the level of individual filaments is important to understand and predict the macroscopic deformations of a fabric during forming. The contact mechanics based friction model in this work confirms an experimentally observed decrease of Frictional forces with an increasing roughness of the counterface. The developed model provides a qualitative understanding of the Frictional Behaviour of filaments on a cylindrical metal counterface.
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Frictional Behaviour of high performance fibrous tows a contact mechanics model of tow metal friction
Wear, 2013Co-Authors: Bo Cornelissen, Bert Rietman, M B De Rooij, Remko AkkermanAbstract:Composites forming processes involve mechanical interactions on the ply, tow, and filament level. The deformations that occur during forming processes are governed by friction between tows and tooling material on the mesoscopic level and consequently between filaments and a counterface on the microscopic level. A thorough understanding of the Frictional properties on the level of individual filaments is important to understand and predict the macroscopic deformations of a fabric during forming. The contact mechanics based friction model in this work confirms an experimentally observed decrease of Frictional forces with an increasing roughness of the counterface. The developed model provides a qualitative understanding of the Frictional Behaviour of filaments on a cylindrical metal counterface.
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Frictional Behaviour of high performance fibrous tows friction experiments
Composites Part A-applied Science and Manufacturing, 2013Co-Authors: Bo Cornelissen, Bert Rietman, Remko AkkermanAbstract:Tow friction is an important mechanism in the production and processing of high performance fibrous tows. The Frictional Behaviour of these tows is anisotropic due to the texture of the filaments as well as the tows. This work describes capstan experiments that were performed to measure the Frictional Behaviour of aramid, carbon and E-glass tows, both in tow-metal and tow–tow contact. The effects of anisotropy and other processing-related parameters on the Frictional Behaviour of the tows are discussed. The surface topography of the counterface plays a dominant role in tow-metal friction. For tow–tow contact, the relative orientation of the tows dominates the Frictional Behaviour.
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towards modelling of the Frictional Behaviour of deforming fibrous tows ageometrical approach
10th International Conference on Textile Composites 2010, 2010Co-Authors: Bo Cornelissen, Remko AkkermanAbstract:Fibrous tows used in continuous fibre-reinforced polymers (CFRPs) deform geometrically during the production of composite products. The cross-sectional geometry of the tow is influenced by the load-induced deformation mechanisms. A study of the effect of two commonly assumed geometrical tow shapes on an equivalent pressure distribution in a tow-on-a-pin spreading arrangement was performed. The preliminary results show that both elliptic and parabolic tow geometries have qualitatively the comparable equivalent pressure distributions.
W. Grzesik - One of the best experts on this subject based on the ideXlab platform.
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the influence of thin hard coatings on Frictional Behaviour in the orthogonal cutting process
Tribology International, 2000Co-Authors: W. GrzesikAbstract:New knowledge about the tribological response deriving from the interaction of the substrate/coating-chip system, with special attention to the orthogonal cutting process when chatter-free end turning using natural contact tools, is developed. In order to evaluate the Frictional Behaviour of this process under modified contact conditions, experimental investigations including the contact temperature, the contact loads, friction and the Frictional heat flux per unit area were carried out. In contrast to the most obvious approach, the coefficient of sliding friction versus the cutting speed, the contact temperature, the normal pressure and the interface control factor is considered. A number of different coating structures, starting from single up to three and four layer films, in combination with medium carbon and austenitic stainless steels, were tested. It is pointed out that the results obtained provide a modified approach to the Frictional Behaviour of the cutting process and its controllability. Among various responses, specific for such tribo-contact pairs, of particular interest is the self-adaptation resulting in controlled generation of friction energy and conduction of the Frictional heat flux.
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Influence of thin hard coatings on Frictional Behaviour in the orthogonal cutting process
Tribology International, 2000Co-Authors: W. GrzesikAbstract:New knowledge about the tribological response deriving from the interaction of the substrate/coating-chip system, with special attention to the orthogonal cutting process when chatter-free end turning using natural contact tools, is developed. In order to evaluate the Frictional Behaviour of this process under modified contact conditions, experimental investigations including the contact temperature, the contact loads, friction and the Frictional heat flux per unit area were carried out. In contrast to the most obvious approach, the coefficient of sliding friction versus the cutting speed, the contact temperature, the normal pressure and the interface control factor is considered. A number of different coating structures, starting from single up to three and four layer films, in combination with medium carbon and austenitic stainless steels, were tested. It is pointed out that the results obtained provide a modified approach to the Frictional Behaviour of the cutting process and its controllability. Among various responses, specific for such tribo-contact pairs, of particular interest is the self-adaptation resulting in controlled generation of friction energy and conduction of the Frictional heat flux.
