Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 144 for “"Friction Coefficient"”.
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Experimental evaluation of effective friction coefficient for liquid ring seals
… dependent upon several parameters, including the friction holding force between the sealing face and the mating retaining ring. Designers currently assume a value for effective friction coefficient in order to utilize methods for prediction of response and stability. This thesis presents the …
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Tire-Road Friction Coefficient Estimation Using a Multi-scale, Physics-based Model
… and steady-state maneuvers is predicated on the friction forces generated at the tire-road interface. A general method for predicting friction coefficients for an arbitrary asphalt pavement surface would be an invaluable engineering tool for designing many vehicle safety and performance features, …
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The friction coefficient of soft contact lens surfaces in relation to comfort and performance
… tensile characteristics. It is likely that the frictional properties also vary between materials. It is known that constituents of the tear film interact with contact lens materials to form a biofilm on the lens surface. The hypothesis of this research is that although the frictional properties …
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Experimental modelling of surface roughness and dynamic friction coefficient of diamond like carbon coated shafts
… with DLC often have strict surface roughness and friction coefficient goals. This research investigates the surface roughness and friction coefficient properties of uncoated and DLC coated specimens in an effort to satisfy two particular requirements of the industry. The first requirement is to …
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The Sliding Friction of Bonded Solid Lubricants
… of papers containing detailed data about the friction and wear of BSL coatings. The general theories of friction for metals in sliding contact and the friction theory applied to solid film lubrication are reviewed. A section is also included on Herzian contact theory and its application to …
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Functional coatings deposited by an Atmospheric Pressure Plasma Jet (APPJ) system over Thermoplastic Elastomer (TPE) substrates
The study of the friction coefficient and the hydrophobic character has long been of great importance in the automotive industry where some areas of the vehicle are subject to slippage. One example is the space between the window channels and the glass. The polymeric materials that are used in …
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Slip effect on stagnation-point flow past a permeable quadratically stretching or shrinking sheet
… The effects of governing parameters on the skin friction coefficient, local Nusselt number and dimensionless velocity and temperature profiles are described graphically. Skin friction coefficient f'(0) and g'(0) increase as suction increases. For local Nusselt number h(0) decreases as suction …
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The effects of rubber modification on friction and wear of epoxy networks
… (CTBN), to enhance its fracture toughness. The friction and wear of specimens modified with different amounts of elastomer were investigated in a pin-on-disk wear machine. An attempt was made to correlate the fracture toughness of the epoxy material to its fatigue wear rate for experiments in …
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Stagnation-point flow past a vertical stretching or shrinking sheets in a nanofluid with slip effect
… q.. are investigated graphically on the skin friction coefficient, C, , Iocal Nusselt number,Nu,and local Sherwood number,Sh,. Comparison with previously published results for the skin friction co-cfficient, f'(0). rale of heat transfer, -θ(0) and rate of mass transfer. -'(0) steady-slate case …
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Pharmaceutical powders in experiment and simulation : towards a fundamental understanding
… simulate the relative importance of cohesion and friction. For angle of repose simulations, increasing the cohesion increased the final angle in a consistent, linear fashion. Increasing the interparticle friction coefficient increased the final angle up to a critical friction coefficient. For the …
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Floating head skin friction gage measurements in supersonic flows
Two floating head skin friction gages have been designed and tested to directly measure the skin friction coefficient for the undefined flow in a SCRAM-jet engine. The skin friction gage designs contain a floating head that is supported by ball bearings which allow it to move in any horizontal …
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Numerical analysis of a fin-tube plate heat exchanger with winglets
… characteristics of average Nu number and skin friction coefficient are studied numerically by the aid of the computational fluid dynamics (CFD) commercial code of FLUENT ANSYS 14. The results showed increasing in the heat transfer and skin friction coefficient with the increasing of Re number. …
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Experimental Characterization and Modeling of Tire-Ice Interface
… film created by the heat generated due to the friction force. Next, the viscous friction coefficient at the contact patch is obtained. By using the thermal balance equation at the contact patch, dry friction is obtained. Knowing the friction coefficients for the dry and wet regions, the …
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Fault damage zones and friction: insights from shallow Japan Trench drill core
… slip behavior. Shear displacement on faults is a frictional phenomenon in the sense that slip begins when the ratio of shear to normal stress surpasses the static friction coefficient (μs). Thus, earthquakes and the associated patterns of slip are controlled by the frictional properties of faults. …
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A study of velocity profile models and wall shear stress for two and three-dimensional turbulent boundary layer flows
… in order to obtain reasonable values for the friction losses in a boundary layer. A discussion of the error in the determination of the skin friction coefficient by use of the Glauser Chart was presented. The experimental constants in the law of the wall formulation are shown to be the basis …
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Investigation on Physics-based Multi-scale Modeling of Contact, Friction, and Wear in Viscoelastic Materials with Application in Rubber Compounds
… modeling of tribological phenomena of contact, friction, and wear in viscoelastic materials with application in rubber compounds. Tribiological properties of rubber compounds are important for many applications such as tires, shoe heels and soles, wiper blades, artificial joints, O-ring seals, …
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Dowel-concrete contact characteristics
… the dowel-pulling force and the dowel-concrete coefficient of friction were measured using a novel laboratory setup of vibrating wire strain gauges embedded in both the dowel and concrete. The gages are set to measure the shrinkage strain induced in the concrete that surrounds the dowel as it …
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Regulation of lubricin gene expression and synthesis in cartilage by mechanical injury
… joints to provide load distribution and frictionless motion. Lubricin, a glycoprotein which concentrates at the superficial layer of the cartilage, contributes to the low friction coefficient. Mechanical injury to cartilage increases the risk of osteoarthritis (OA), characterized by …
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STRESS RESPONSE OF STATIC PARTICULATE MEDIA
… perturbations. We first study stress response in frictionless and frictional shallow, ordered, granular arrays confined by solid boundaries for a range of system sizes. Stress response profiles from inside the packing and at the boundaries for frictional packings agree well with the predictions …
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Tire Models for Use in Braking Applications
… it is important that the system can utilize all friction resources. The brush tire model was a popular method in the 1960's and 1970's before the empirical approaches became dominating. The brush model gives an educational interpretation of the physics behind the tire behavior and explains that a …
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