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Showing 1 to 12 of 12 for “"Stribeck"”.
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A tribological study of the interaction between surface micro texturing and viscoelastic lubricants
… and the resulting data is normalized to obtain a Stribeck diagram that spans the lubrication regimes from boundary lubrication to hydrodynamic lubrication. Each lubricant/surface pair results in a unique curve that is subsequently compared to other lubricant/surface pairs in order to study the …
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Defining the role of elastic lubricants and micro textured surfaces in lubricated, sliding friction
… the resulting altered frictional profile on the Stribeck diagram. In this work, isolating non-Newtonian effects in the lubrication flow is shown to normalize the frictional profiles of elastic and Newtonian lubricants. These non-Newtonian effects were determined to be the shear rate-dependent …
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Investigation of Acceleration Dependent Nonlinear Lubricated Friction in Hydraulic Actuation Systems
… the characteristics of friction is that of Stribeck in which the dependency of the friction force is based on velocity alone. However, experimentally, it has been found that lubricated friction is dependent on acceleration. Thus, the Stribeck model can be considered as a subset of a dynamic …
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Friction and lubrication behaviour of hip resurfacing metal-on-metal and ZTA ceramic on CFR peek implants with various diameters and clearances. Friction and lubrication behaviour of hip resurfacing Co-Cr-Mo and zirconia toughened alumina ceramic heads against carbon fibre reinforced poly-ether-ether-ketone cups with various diameters and clearances have been investigated using serum-based lubricants.
… along with Sommerfeld numbers leading to Stribeck analysis and hence the lubricating mode was also investigated. This involved using lubricants based on pure bovine serum (BS) and diluted bovine serum (25 vol. %BS+75 vol. %distilled water) with and without carboxymethyl cellulose (CMC) (as …
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Friction and lubrication behaviour of metal-on-metal and ZTA ceramic-on-CFR PEEK hip prostheses. Friction and lubrication behaviour of metal-on-metal hip resurfacing and ZTA ceramic heads versus CFR PEEK cups wiith various diameters and clearances using serum-based lubricants with various viscosities.
… so as the friction factor can be calculated. Stribeck analysis was then employed to assess the mode of lubrication. For the metal-on-metal hip resurfacing joints, the friction factors were in the range 0.03-0.151 and those for the ZTA ceramic heads versus CFR PEEK cups were in the range …
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Study of a Modified Friction Device for the control of civil structures
… LuGre friction model that takes the stiction and Stribeck effect into account in the dynamic behavior. Then, several simulations have been run to evaluate how the device behaves and how it dissipates energy in a structure under seismic and wind loads. Three interesting results emerged. Firstly, …
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Investigating Tempo-Oxidized Cellulose Nanofiber Lubricating Greases Using Microscopy, Rheology, and Tribology
… obtained for fiber-like samples (≈ 35 kPa). Stribeck and steady sliding wear curves revealed excellent boundary lubrication coefficient of friction performance in the range of 0.05-0.10 for all samples courtesy of both oleic acid and nanoparticle surface activity/tribofilm generation. It also …
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Theory and numerical modelling of dynamic ice-structure interaction for ice-induced vibrations
… The similarity between stress-strain curve and Stribeck curve shows that static and kinetic friction force variations are attributed to ice force characteristic, and can be used to explain the lower effective pressure magnitude during continuous crushing than the peak pressure during …
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Tribological and Structural Characterisation of Ceramic on Metal Hip Replacements
… to be identified through the generation of a Stribeck Curve. The results showed low wear rates for all materials and sizes tested, compared with standard metal on polyethylene and metal on metal components. The wear of the ceramic heads was unmeasurable using the gravimetric method, as the …
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Numerical Simulation of Contacts Working Under Mixed Lubricating Conditions
… surfaces. In contrast to HLFigure 1.1 The Stribeck curve [3]., the interface for the mixed region of lubrication is not fully separated. Therefore, some external load is sustained by interrupted lubricant film, and some by direct contact with solid asperities. As a result, when trying to …
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Settling-Time Improvements in Positioning Machines Subject to Nonlinear Friction Using Adaptive Impulse Control
A new method of adaptive impulse control is developed to precisely and quickly control the position of machine components subject to friction. Friction dominates the forces affecting fine positioning dynamics. Friction can depend on payload, velocity, step size, path, initial position, temperature, …