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 118 for “"Coefficient of Friction"”.
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Effect of hydrogen on the coefficient of friction of iron
The friction force of an Annco iron-on-Annco iron sliding system was measured in laboratory air, nitrogen, and hydrogen. The coefficient of friction for each environment was calculated and the amplitude of the "stick-slip" behavior from each environment was observed. It was found that the …
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An experimental investigation of the static coefficient of friction for sheetpile interlocks
The classical use of 0.3 for the static coefficient of friction for sheet pile interlocks was investigated in this study. The effects of cyclic displacements on the coefficient of friction of the interlocks was also examined. A broad range of values for the coefficient of friction was observed for …
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An Experimental Method to Calculate Coefficient of Friction in Mecanum Wheel Rollers and Cost Analysis Using DFMA Techniques
<p>Mecanum wheel is a special kind of omni-directional wheel which is designed for robot vehicles. The purpose of this thesis is to work on geometry and working of Mecanum wheel rollers and to conduct experiments on these rollers to find its values of coefficient of friction in different …
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Strength envelopes for deforming oceanic lithosphere with some implications for the history of lithospheric deformation of the equatorial Indian Ocean
… m -1 [95% confidence limits]). Thus the strength of oceanic lithosphere is over-estimated. Either pore pressure is much higher than hydrostatic, or the effective coefficient of friction is much lower than found in laboratory experiments, or both. For models in which the pore pressure is nominally …
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The effects of load and humidity on friction and life of polymeric coatings used to prevent fretting corrosion
… analysis was conducted to investigate the effect of applied load and relative humidity of the atmosphere on the durability and coefficient of friction of five polymer coatings used to protect against fretting corrosion. Chlorine and non-chlorine containing polymers were used in this research to …
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Polyacrylamide hydrogel friction controlled by time-dependent surface energy due to poroelastic relaxation
This thesis explores the control of friction by varying contact area, contact time, and sliding speed of polyacrylamide hydrogel. With a comprehensive understanding of the phenomenon, hydrogels could be designed with targeted friction behavior, and be used to design surfaces for tissue engineering …
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Enhancement of lateral stability for a multi-wheeled combat vehicle using various control strategies
… higher load transfer which can lead to a loss of the grip between the tires and the ground. Consequently, deterioration of vehicle handling capability can occur. Hence, integration of Semi-Active Suspension (SAS) is introduced to each control strategy to enhance the vehicle’s lateral stability …
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Infrared measurements of steady-state temperatures and average surface temperature distributions for silver sliding on sapphire
Surface temperatures generated by dry sliding friction were measured with the use of an infrared radiometric microscope system developed at Virginia Polytechnic Institute and State University. Silver was used as the test material because of its resistance to oxide formation. The effects of load, …
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Estimation of Real-Time Runway Surface Contamination Using Flight Data Recorder Parameters
<p>Within this research effort, the development of an analytic process for friction coefficient estimation is presented. Under static equilibrium, the sum of forces and moments acting on the aircraft, in the aircraft body coordinate system, while on the ground at any instant is equal to zero. Under …
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Evaluating the Sensitivity of the Auckland Pavement Polishing Device and Analysis of Aggregate Microtextural Wear
… by vehicle tyres, reducing the micro-texture of aggregates and macro-texture of the road surface, resulting in a deterioration of skid resistance. Consequently, it is necessary to be able to accurately predict the skid resistance performance of aggregate as part of the design process. …
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Effects of various inefficiencies in rowing on shell speed
… predictions were made in determining the effects of various sources of inefficiency in rowing on shell speed. These predictions were then tested using a MATLAB model of the rowing stroke. The model simulates an eight man oared rowing shell and determines average shell speed, stroke rating, power …
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Development Of Titanium Nitride/molybdenum Disulphide Composite Tribological Coatings For Cryocoolers
Hydrogen is a clean and sustainable form of carrier of energy that can be used in mobile and stationary applications. At present hydrogen is produced mostly from fossil sources. Solar photoelectrochemical processes are being developed for hydrogen production. Storing hydrogen can be done in three …
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Infrared microscope studies of surface temperatures produced by friction with graphite-epoxy and carbon-PEEK composites
… to measure the temperatures at the interfaces of graphite-epoxy and carbon-PEEK composites in unidirectional sliding contact with sapphire. Effects of fiber orientation and velocity on tribological parameters were examined. Oscillating contact conditions with graphite-epoxy were also examined. …
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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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A Method for Modeling and Prediction of Ground Vehicle Dynamics and Stability in Autonomous Systems
A future limitation of autonomous ground vehicle technology is the inability of current algorithmic techniques to successfully predict the allowable dynamic operating ranges of unmanned ground vehicles. A further difficulty presented by real vehicles is that the payloads may and probably will …
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Study of Skin Friction and Surface Regression Interaction via the Naphthalene Sublimation Technique
This study explores the potential of the naphthalene sublimation technique to be used to analyze the manner in which surfaces regress, specifically focusing on the effect that skin friction has on regression and vice versa. For this experimentation, a flat steel plate installed with three skin …
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High Speed Atomic Force Microscopy Techniques for the Efficient Study of Nanotribology
… length scales, it is crucial to understand friction and wear at the nanoscale (nanotribology) especially at technically relevant sliding velocities. Accordingly, three novel techniques have been developed to study nanotribology, leveraging recent advances in high speed AFM. The first method …
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LUBRICATION STUDY OF AN OSCILLATING BEARING
This investigation covers the regimes of operation of an unidirectionally loaded sleeve bearing. The particular journal studied was a hardened steel member oscillating through 30 , at various loads and speeds in a hardened steel bushing. From the results it was concluded that there were possibly …
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Finite element analysis of railway track under vehicle dynamic impact and longitudinal loads
… In addition, the increasing tractive power of locomotives leads to significant increase in the longitudinal load demand in railway tracks. The capacity of longitudinal restraint of existing rail fastening system and its dependency on track parameters affects the future design of rail …
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Investigation of Oxide Fiber/oxide Matrix Composites With a Weak Interphase
Interface properties of four kinds of fiber model systems were obtained by analyzing pushout data with the linear model, the shear-lag model, and the Liang-Hutchinson model. These interface properties include interface fracture energy, coefficient of friction, clamping pressure, interface debond …
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