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 19 of 19 for “"contact analysis"”.
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Non-linear Contact Analysis of Meshing Gears
… one of the critical aspects of vibration analysis, and it contains various potential faults such as misalignment, cracks, and noise. Therefore, it requires vibration monitoring to ensure the system is operating properly. Case mounted accelerometers are frequently used to monitor …
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An evaluation of time integration schemes in the solution of contact problems
Contact analysis is an important branch of structural mechanics. The finite element method has become a major solution approach because of the high nonlinearities in contact problems. A large number of algorithms have been proposed and extensively used to solve engineering problems, but some issues …
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Validation of Radiocarpal Joint Contact Models Based On Images from a Clinical MRI Scanner
… One such means is MRI-based modeling for joint contact analysis of in vivo functional loading. The purpose of this study was to validate models generated from a clinical MR scanner for future in vivo joint contact analyses. Models were tested using 3 cadaver forearm specimens and compared with …
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Numerical and experimental investigation of shakedown in evolving non-Hertzian rolling contact
The non-conforming rolling contact under high loads results in considerable plastic deformation of the surface. This surface plastic flow is studied using a twin-disk tribometer, and the observed deformation as a function of the number of rolling cycles is classified into three distinct stages. …
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Development and Validation of Laser-Induced Breakdown Spectroscopy Methods for the Analysis of Aqueous Solutions
… multi-element, nearly non-destructive, speed of analysis, small sample sizes, portability, remote analysis and non-contact analysis. These characteristics make LIBS an attractive analytical technique with the potential for a broad scope of applications.</p> <p>One limitation of LIBS analyses is …
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Vibration Analysis of Single - Anchor Inflatable Dams
… dams with fins are considered. First, a static analysis is performed which yields the equilibrium shapes of the dam, both in the presence and absence of water. Then, a dynamic analysis is undertaken which analyzes the small vibrations of the inflatable dam about the equilibrium configuration, …
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The effect of abrasive properties on the surface integrity of ground ferrous materials.
… of the heat conduction in CBN grinding. A grain contact analysis was developed to predict the energy partitioning between the workpiece and wheel. The analysis takes into account two dimensional transient heat transfer in the grain and maintains temperature compatibility at the grain wear …
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Novel Fluorous Hybrid Surface Modification Characterized by Wetting Dynamics, Morphology and Nanomechanics
… polymer coatings exhibit an expected increase in contact angles with water. Wetting behavior was characterized using the sessile drop technique as well as Dynamic Contact Analysis (DCA, Wilhelmy Plate). Surface composition as well as near surface topology and morphology are characterized by X-ray …
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A Case Study of Parental Behaviors in an English Language Learner Community Technology Literacy Lab Setting and the Extension of the Behaviors in the Home
… learner interviews, field observations, and contact analysis of lesson plans. The following conclusions were derived based on analysis of the data: 1. In the family literacy program that was studied, the only prior factor that appeared to influence the parent's ability to support their …
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Characterization of syntactic foams and their sandwich composites: modeling and experimental approaches
… present work takes modeling and finite element analysis approach to understand and predict the deformation behavior of syntactic foams. Contact analysis is performed on single particle models by the finite element analysis approach. In the second part extensive experiments are carried out to …
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Failure modes of silicon nitride rolling elements with ring crack defects
… The purpose of this study is to examine the contact fatigue failure modes of silicon nitride rolling elements with surface ring crack defects. In this study, new experimental and computational techniques are developed to measure and model the interaction of the surface with pre-existing crack …
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Modelling tribology of slider and disk in a computer hard drive system
… using Accelerated Friction Test (AFT) apparatus. Contact Start Stop (CSS) and constant speed drag tests were performed using commercial rigid disks and two different air bearing slider types. Friction and stiction were captured during testing by a set of strain gauges. System parameters were …
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Dynamic Friction Characterization of Tripod Constant Velocity (Cv) Joints: Experiments, Analysis and Modeling
… measurements was confirmed through FE analysis. Also, the validity of Hertzian contact analysis in a CV joint was assessed using the FE method, and found that the Hertzian solutions are practically applicable under low contacting load. These contact results were incorporated in the …
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Genetic algorithm optimisation of load cell geometry by finite element analysis
… only sensitive to the axisymmetric components of contact stress distribution. The problem of cylindrical load celis subject to frictionless equipollant annular loading is analysed by the method of superposition of the homogenous solutions. A plot of the relationship between sensitivity, load …
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Nonlinear Finite Element Modeling and Analysis of Metal Hot Forming for Automotive Weight Reduction
… multi-stage, large deformation, finite element contact analysis, which considers the effects of thermo-plasticity and austenite decomposition. The developed methodology is applied to the forming process of a transmission clutch hub which is constructed from UHSS 22MnB5 for the purpose of …
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A COMPUTATIONAL APPROACH TO FRETTING WEAR PREDICTION IN TOTAL HIP REPLACEMENTS
… design is the understanding of performance of contact geometry for a given application. “Wear” is one of a number of mechanical failures that can occur in mechanical coupling design. “Fretting wear” occurs where surfaces in contact are subjected to oscillating load and very small relative …
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Prediction and Measurement of the Frictional Torque Characteristics of Radially and Axially Loaded Radial Cylindrical Roller Bearings
… in a bearing, such as the EHL - theory and a contact analysis to determine raceway rolling resistance, and in addition takes into account the frictional forces of the rib / rolling element end face rolling and sliding contact. Comprehensive experimental tests have been undertaken on different …
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Dynamic and quasi-static contact and scratch analysis of micro-nanoscale thin solid films with application to magnetic storage hard disk drives
… mobility, critical understanding of the ensuing contact or impact related behavior of thin solid films used in these systems is of paramount importance for improved design and reliability. In modern micro/nanodevice technologies significant emphasis has to be placed on the design of thin-films …