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.
Results
Showing 1 to 14 of 14 for “"contact stiffness"”.
-
Design, modeling and fabrication of contact stiffness calibration samples for CR-AFM
… a method to experimentally calibrate the contact stiffness of an atomic force microscope (AFM) cantilever tip in contact with a surface, which is a critical step in the measurement of nano-mechanical properties. The calibration exploits the relationship between contact resonance (CR) …
-
Probing local thermal, mechanical, and optical properties utilizing dynamic cantilever response in contact mode atomic force microscopy
… and implementation of micromechanical contact stiffness devices which provide a range of known contact stiffness. These devices are useful for calibrating dynamic cantilever response as a function of contact stiffness, which is critical for AFM measurements of mechanical properties. …
-
Impact Mechanics Of A Lap Joint: A Theoretical-Based Parametric Study
… parameters are studied: damping ratio, contact stiffness, position of intermediate springs, gaps, excitation amplitude and beam height. For all parameters, the system response was highly controlled by modes with two contacting springs. Regarding damping, increasing damping ratio reduces …
-
Fundamental Modeling and Experimental Investigation of Dynamic Friction at the Meso and Micro Scales
… been discussed for low roughness surfaces in contact, as is the case in micro applications, such as magnetic storage applications. The adhesion model is based on the improved DMT contact mechanics model, and the simulation results have shown certain limitations of the proposed adhesion and …
-
Silicon nanowire anode for lithium-ion batteries: fabrication, characterization and solid electrolyte interphase
… and conductive nickel monosilicides ohmic contacts were created via simple one-step thermal annealing procedure between nanowires and nickel electrodes for integration. Composite anodes were prepared from electrolessly fabricated silicon nanowires for lithium-ion batteries, and an addition …
-
Modeling of Transient Response of an Elastic Beam With Flexible Supports and Variable-Location Impact
… health and estimating wear-limited life of contact/impact machinery components. Prevention, or at least early notification, of impact-induced wear is essential for preventing economic loss and enhancing personnel safety. Thus, an efficient model which is discrete in time and continuous in …
-
Implicit Finite Element Contact With a Multigrid Solver on Parallel Computers
Finite element contact is an important analysis tool that has received a significant amount of research attention. The fact that contact problems are geometrically non-smooth as well as algebraically non-linear makes them difficult to solve. Since the bulk of the work in a contact algorithm is …
-
The vibration of rolling discs
… due to rotation of the disc and the effect of contact on the disc which in the first instance is modelled as a simple pinning constraint. Further in depth analysis is described for a more realistic model of the rolling contact including the effect of the contact stiffness and the creepage …
-
Optical transient grating measurements of micro/nanoscale thermal transport and mechanical properties
… behavior due to the interaction between an axial contact resonance of the microspheres and the surface acoustic wave at a frequency of -200MHz for the 1 [mu]m spheres and -700 MHz for the 0.5 [m spheres. The experimental measurements were fit with an analytical model in which the contact stiffness …
-
Finite element based modeling of multi-asperity contact and validation of Greenwood-Williamson model
The Greenwood-Williamson (GW) model of contact between rough surfaces is a widely acclaimed model that has been used to predict contact stiffness and other contact parameters. A main limitation of this model is often cited as it is ignoring of asperity interaction effects. This thesis aims to …
-
Mutual pounding of structures during strong earthquakes
… of structural systems with varying mass, stiffness, and seismic joint gaps, subjected to several different input motions are examined. To evaluate the effects of pounding, the numerical results with and without pounding have been considered. The resilience between two impacting masses is …
-
Micro-injection moulded microneedles for drug delivery.
… and surface energies have been obtained using contact angle measurement and calculated using Owens-Wendt theory. Adsorption performance of bovine serum albumin and release kinetics for each sample set was assessed using a Franz diffusion cell. Results indicate that plasma treatment …
-
Simulación de empujes del material almacenado en silos con modelos de comportamiento del material no elásticos = Numerical simulation of loads exerted by stored materials in silos with non-elastic material models
… los parámetros que definen el modelo de contacto entre el material almacenado y la pared y el proceso de llenado del silo. Asimismo, los resultados numéricos obtenidos se han comparado con los resultados experimentales medidos en tres silos de acero liso instalados en el marco del …
-
Dynamic Loading of Structures by High Speed Granular Media
… the flowing granular media and the structure. A contact model involving multiple parameters is used for inter-particle and particle-target contact. Firstly, a numerical analysis is performed to characterise the temporal evolution of slugs and their impact on monolithic beams constrained at the …