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 28 for “"frictional force"”.
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On the Interactions of Augmin with Microtubules and the Mechanics of the Cross-Linker PRC1
… microtubules; second, the cross-linker PRC1's frictional response resisting motion between two microtubule filaments was analyzed to determine the dependence of the frictional force on the binding conditions of the cross-linker. For the augmin complexes studied sub-second interaction times were …
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A leak detecting technique utilizing an abrupt and large pressure drop
… would use thin flaps, or "leaves," that would be forced outward by the rapid pressure drop formed in proximity to the leak. In order to determine the characteristic behavior of the system, several simulations, with a circular hole as the leak, were ran that showed that the significant pressure …
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An investigation of polymer wear due to fatigue using a constant strain wear test
… inhomogeneities, and localized adhesive forces. The adhesive forces were seen to increase as the number of cycles of the test increased eventually becoming the dominant frictional force.
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Characterizing the Frictional Interface in Friction Stir Welding
<p>Quantitative understanding of frictional phenomena between the tool and the workpiece is essential for accurate modeling of the Friction Stir Welding (FSW) process. Two methods of measuring the tool-workpiece interface are proposed that allow frictional measurements to be made under extreme …
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A Comparative Study of Conventional-Ligating and Self-Ligating Bracket Systems
… purpose of this research was to determine the frictional resistance of four self-ligating brackets and two conventional bracket systems using two different types of orthodontic arch wires in both wet and dry fields. Six different brands of upper right central incisor brackets with 0.018-in …
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Investigation of frictional resistance on orthodontic brackets when subjected to variable moments
… were measured. Dynamic friction was the frictional force that occurred when the applied force was variable (dynamic load). The results showed that static and kinetic friction were similar while dynamic friction was statistically greater. The Minitwin and Transcend 6000 brackets produced …
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Constitutive Modeling of Friction in Bolted Connections
… optimize designs. However, the exact nature of frictional contact between components is unknown and poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and physics-based modeling approaches to identify improvements to current models and …
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Designing anisotropic friction through limit curve analysis
… applications. Therefore, control of anisotropic frictional surfaces could result in more precise movement in manipulation, locomotion, and other facets touched by frictional contact. To arrive at such controllability, frictional force was collected across a spectrum of anisotropic micro-textures, …
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Dahl friction modeling
… friction; however, the discontinuity during force reversal of the Coulomb friction model has long been a point of contention since such a discontinuity does not accurately portray the behavior of real systems. Other models have been suggested, but variations of the Dahl solid friction model …
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An experimental study of frictional phenomena around the pin joints of plates using moire interferometry
… material, Aluminum 7071-T6, studies on frictional phenomena between the pin and plate are conducted to provide a comprehensive treatment of the following subjects: slip-stick phenomena, variation of contact zone, distribution of frictional force at the contact region, effects of …
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Intraoral Corrosion of Self-ligating Metallic Brackets and Archwires and the Effect on Friction
… purpose of this study was to investigate how the frictional coefficient was affected due to intraoral use. A secondary aim of this study was to determine whether or not there was a relationship between corrosion of orthodontic alloys and friction via scanning electron microscopic qualitative …
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Oxidational wear of low alloy steel in gases other than air
… Also, the experiments were conducted to study frictional force, surface and contact temperatures and surface parameters of the wearing pins. The wear debris was examined using x-ray diffraction technique for the identification of compounds produced by the wear process. Scanning electron …
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Going With The Flow: Selective phosphodiesterase 4D7 (PDE4D7) regulation of vascular endothelial cell responses to fluid shear stress
… regulate their phenotype in response to the frictional force exerted by the flowing blood, fluid shear stress (FSS). The hemodynamics dictating this force determine, to a large extent, the likelihood that a given region of a blood vessel will develop atherosclerotic plaque. In linear arterial …
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The Boundary Lubricated Friction and Wear of Low Alloy Steel
… m/s for a range of loads up to 220 N. Wear rate, frictional force and pin temperature were continually monitored throughout tests and where possible complementary methods of measurement were used to improve accuracy. A number of analytical techniques were used to examine wear surfaces, debris and …
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A molecular dynamics study of the tribological properties of diamond like carbon
… dynamics (MD) simulations with a reactive force field (ReaxFF) to study the friction and wear between DLC counterfaces, both in comparison to and in contact with steel counterfaces. We show that the tribological properties of DLC in dry sliding friction are heavily dependent on both the …
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Developing a Technique to Create a Uniform, Targeted, Transient Shear Stress Stimulus to Assess Endothelial Function
… diameter. Blood flow-associated shear stress (frictional force) imparted on the endothelium stimulates vasodilation (flow-mediated dilation, FMD). FMD as an index of endothelial function is stimulated by an uncontrolled increase in shear stress created with limb occlusion release [reactive …
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Detection of critical driving situations in motorcycles
… a result of an induced complex system of dynamic forces. The rapid advancements in computer information and electronic technologies have led to increased interest to address stability issues, hence improving motorcycle safety through embedded electronic systems. The motion along a curved path is …
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Characterization of cyclic plasticity type wear mechanism for titanium alloy, TI-6AL-4V on reciprocating sliding wear test
… sliding wear behavior are investigated. Frictional force resulted 60 – 80 N tangential force in range for those three parameter setup by both two contact pins cylinder. The COF resulted running-in condition at the earlier second and highest peak experienced in value range of 0.45-0.48. …
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Polymer architecture effects on mechanochemical reactions
… highly extended in elongational flow fields. The forces developed along the backbone give rise to scission of the chains near their center. Recently, this unique property of polymers has been adopted to explore new chemical transformations by embedding structural elements into the backbone …
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Molecular dynamics-based approaches for mesoscale lubrication
… times the size of the slip length, the normal force and the frictional force are overestimated by a factor of 1.5 when assuming no-slip. By modifying the Twin Land Oil Control Ring (TLOCR)-liner interface model to include slip, we find significant reduction in the hydrodynamic pressure and the …
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