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 25 for “"Elastic theory"”.
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Theoretical and Experimental Investigation of Adhesion in Microelectromechanical Systems
Based on the Extended-Maugis-Dugdale (EMD) elastic theory, an improved single asperity meniscus model considering asperity deformation due to both contact and adhesive forces was developed. Specifically included in this model was the solid surface interaction inside the contact area. It was found …
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Topological descriptions of grain boundaries in graphene
… of graphene grain boundaries using the linear elastic theory of dislocations to nucleate and propagate grain boundary kinks.
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Plane frame element addition to the MESS finite element program
A plane frame element based on linear, elastic theory is developed and implemented into the MESS finite element program. Post-processed results include nodal displacements, end reactions, maximum tensile and average shear stress, and a deformed geometry plot. The element is tested for accuracy …
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Dynamic analysis of a marine riser
… for a beam undergoing finite rotations. The elastic strain energy is expressed in terms of these deformations and the Lagrange equations are used to derive the equations of motion valid for large deformations. The three dimensional shear effect based on nonlinear elastic theory is included in …
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Selective assembly in deformable systems using templated assembly by selective removal
… interacting surfaces. Therefore, the Hertzian elastic theory for contact between a sphere was used for deciding whether the assembly of two new materials is attributed to shape matching or to plastic deformation. In accordance with the stated hypothesis, it was concluded that the assembly of …
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Multiscale mechanical studies of nacre from gastropod mollusk Trochus Nilocitus
… at loads below 100 [micro]N. Using the contact elastic theory, a Young modulus of 112.3 GPa and a hardness of 10.5 GPa were found for an individual platelet. This study shows that a biocomposite principally composed of a poor ceramic (aragonite) can achieve surprisingly good macroscopic …
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The static and dynamic fracture of brittle materials
… from atomic bond energy data, anisotropic elastic theory was used in the evaluation of the fracture surface energy.
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Evaluation of FWD software and deflection basin for airport pavements
… their analysis algorithms are based on layered elastic theory with linear materials models. In addition, they consider static loading, which is not the true representation of the dynamic loads applied in a FWD test in the field. To this end, this study performs a dynamic analysis of the FWD …
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Simulated Response of Degrading Hysteretic Joints With Slack Behavior
… in conjunction with beam on elastic foundation theory, elastic theory, and a modified Tsai-Wu Failure criterion. The devised computer model enhances the understanding of the mechanics of multiple-bolt joints in timber, and yields valid predictions of joint response of …
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Graphene under strain. A combined continuum-atomistic approach
By combining continuum elasticity theory and atomistic simulations, we provide a picture of the elastic behavior of graphene, which was addressed as a two-dimensional crystal membrane. Thus, the constitutive nonlinear stress-strain relations for graphene, as well as its hydrogenated conformers, …
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Finite element formulation of a thin-walled beam with improved response to warping restraint
Linear elastic theory of torsion and flexure of thin-walled beams as developed by Vlasov and Timoshenko respectively are well known and commonly used in everyday engineering practice. However there are noticeable differences between calculations and experimental results. The difference is partly …
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Composite Pavements: A Technical and Economic Analysis During the Pavement Type Selection Process
… analysis based on the multi-layer linear elastic theory was performed on different composite structures to understand the behavior they present when compared to traditional pavements. In addition, distresses affecting composite pavements such as fatigue (bottom-up and top-down) cracking, …
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A deflection theory for anisotropic plates in which coupling between lateral deflection and in-plane displacement is present and the effect of coupling on the buckling load
… purpose of the present paper is to provide an elastic theory from which problems involving coupling may be approached. Potential energy and equilibrium expressions will be derived for these are the components of the theory which are lacking. The potential energy expression may be used either in …
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Movements of footings and retaining walls
… the settlement. A simple procedure based on elastic theory was also developed to estimate movements of abutments and retaining walls due to the weight of backfill placed behind them. To avoid the inherent difficulty in determining the soil modulus, a procedure for relating these movements to …
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Modelling Masonry as a Continuum: Finite Element Analysis using ABAQUS
… structural integrity. However, conventional elastic theories often fall short in capturing the complexities of masonry, leading to potential oversights in assessment and accurate behaviour analyses. Jacques Heyman's critique of elastic theory highlights the need for alternative approaches, …
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Topological defects in single and multi-layer graphene
… topology nor a formal presentation of a linear elastic theory of dislocation between two 2D materials. In this thesis, we address these two dislocations by defining their topology and developing continuum dislocation models to isolate the mechanics of dislocations in graphene systems from …
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Constraining Metamorphic and Tectonic Evolution in Convergent Terranes: How Trace Elements and Mineral Inclusions Shape Mechanical and Reconstructive Models
… this dissertation, I discss the application of elastic theory in reconstructing conditions of inclusion encapsulation through inclusion pressure estimation with Raman spectroscopy. In some instances, overpressuring of quartz inclusions in garnet give evidence for high-pressure formation …
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The Creep Behaviour of Rubbers Reinforced with Particulate or Short Fibres
Elastic stress-strain testing and (primary and secondary) creep testing have been carried out on unfilled polyurethane rubber and two rubber composites filled with 10 vol% and 20 vol% alumina particulates. They have been run at three different temperatures (20°C, 45°C and 65°C) for all three …
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SEITRON SEIsmic elecTRONic handbook : a knowledge based systems approach to structural steel design
… using finite elements, static and dynamic elastic theory; however, there are very few design packages which transpose the forces from the analysis software into quantifiable results of beam, columns and connections. The objectives of this thesis is to clarify and illustrate the design …
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