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 43 for “"pressure loading"”.
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Effects of atmospheric pressure loading on GPS measurements
… explanation for these height variations is loading of the Earth's surface. We examine the relative contribution of atmospheric pressure loading to the total signal by modeling loads utilizing Farrell's elastic Green's functions. A focus on four permanent GPS sites provided insight on coastal …
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Numerical analysis of elastic membrane structures subjected to hydrostatic pressure loading
… while partly or totally subjected to pressure loading of the hydrostatic type. The possibility of wrinkling is accounted for by employing a Relaxed Strain Energy Density. The numerical procedure is based on the Dynamic Relaxation Method. This is an explicit, iterative technique in …
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Prediction of erosion in cementitious materials subject to high thermal and pressure loading
The project is a collaboration between the University of Central Lancashire and British Aerospace Warton concerned with the modelling of onset of failure in limestone concrete, due to hot jet exhaust gases impinging on the concrete surface. The temperature distribution was produced using a constant …
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A Dynamic Stress Investigation of Intersecting Cylinders by the Finite Element Method
… under the several different types of loading such as inplane moment, out-of-plane moment and torsion as well as an internal pressure loading. The stress indices are deduced and then compared with the present ASME code implementation regarding intersecting cylinders.
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Análise estrutural de painéis curvados reforçados sob carregamento de pressão externa uniforme
… reinforced curved panels under uniform external pressure loading is investigated in this study through experimental tests and numerical simulations based on the finite element method. The experimental tests carried out in this investigation cover tensile testings, imperfection measurement and …
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Numerical analysis and material selection of functionally graded pipes based on metals and ceramics for deep offshore oil and gas operations in Gulf of Guinea
… unique materials that could withstand both the loading conditions of the operations and the corrosion resistance. The work presented herein has explored the use of Functionally Graded Material (FGM) to validate its ability to proffer solutions to deep offshore oil and gas operations and their …
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Studies on strength and stability of toroidal shell forms for containment applications
… including unconventional ones under axisymmetric pressure loading, i.e. when each of the shells is used as a pressure vessel and a storage tank. Following the general strategy developed for shells of revolution by Zingoni (1997) over the past 20 years, reasonably accurate results for shell …
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Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement
… deformation of the Kevlar walls under wind loading. Such data, when used in conjunction with knowledge of the pre-tension in the Kevlar wall and the material properties of the Kevlar, yields the pressure loading experienced by the wall. The pressure loading problem constitutes an inverse …
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Investigation of a flexible inextensible composite membrane reflector
… only two arrays of reinforcement subjected to pressure loading was investigated as a function of the matrix and fiber material properties. Additionally, an experimental investigation was performed to determine if a composite material with a very flexible matrix can be analyzed as a conventional …
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Mechanical Characterization and Modeling of Solid Oxide Fuel Cell Electrolytes with Honeycomb Support
… the electrolyte in response to both thermal and pressure loading while being mindful of electro-chemical performance.</p><p>The electrolytes are further modeled in the context of an SOFC stack assembly with thermal and pressure loading. Current-collecting metal foams which neighbor the …
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A numerical study into the effects of turbulent flows around full-scale buildings
… model with two alternative proposals for the pressure-strain correlations and a k-E model used in conjunction with both linear and nonlinear stress-strain relationships. The governing differential equations were discretized using finite-volume techniques and a co-located variable-storage …
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Geometrically Nonlinear Analysis of Axially Symmetric, Composite Pressure Domes Using the Method of Multiple Shooting
… shells of revolution, under internal pressure loading. The analysis is based upon direct numerical integration of the governing differential equations, written in first-order state vector form. It is assumed that the loading and response of the shell are both axially symmetric; the …
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Measurements of the Tip-gap Turbulent Flow Structure in a Low-speed Compressor Cascade
… between the tip and the casing. The endwall pressure measurements and the surface oil flow visualizations were made on a stationary endwall to obtain the flow features and to determine the measurement profiles of interest. A custom-made miniature 3-orthogonal-velocity-component fiber-optic …
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Response of thin circular plates to central blast loading
… circular metal plates subjected to central blast loading is investigated using the ABAQUS general purpose finite element code. The finite element code incorporates non-linear geometry and material effects as well as strain rate sensitivity. A material failure model is also incorporated. The SA.XI …
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Accelerated Testing Method to Estimate the Lifetime of Polyethylene Pipes
… of the time-to-failure under different loading levels allows designers to choose the best polymeric material for a specific application. Additionally, it helps material producers to design, manufacture, test, and modify a polymeric material more rapidly. In the case of polymeric pipes, …
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Geomechanical aspects of Sintered Silicon Carbide (SSiC) waste canisters for disposal of high level radioactive waste
… to be considered in case of impact or point-like loading. The third and most extensive part of the thesis part contains numerical simulations, which consider most critical potential loading situations during transport and installation of the canisters underground. Both, pure elastic continuum and …
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Static and Dynamic Stress/Strain Properties for Human and Porcine Eyes
… strain properties for ocular globe rupture. A pressure system was built to examine static and dynamic globe rupture pressures for healthy postmortem human and porcine (pig) eyes. Maximum rupture stress for the quasi-static tests was found to be 11.17MPa for human tissue and 12.08MPa for porcine …
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Experimental Characterization and Analysis of Simple Residential Structures Subjected to Simulated Sonic Booms
… cannot exceed that of the broadband, low-overpressure noise produced by subsonic airplanes for the restriction to be lifted. Therefore, the ability to understand and accurately reproduce the acoustic response of a sonic boom is important for psychoacoustic classification of their tolerability …
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Analysis and Modeling of the Mechanical Durability of Proton Exchange Membranes Using Pressure-Loaded Blister Tests
… fuel cell durability. In this thesis, pressure loaded blister tests are used to study the mechanical durability of Gore-Select® series 57 over a range of times, temperatures, and loading histories. Ramped pressure tests are used with a linear viscoelastic analog to Hencky's classical …
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Measuring Material Properties of Proton Exchange Membranes using Pressure Loaded Blister Testing and Digital Image Correlation
… for fuel cell membranes subjected to ramped pressure loading to form stress-strain curves that indicate the onset of yielding under biaxial stress conditions. Stress-life curves are developed experimentally for Gore-Selec? series 57 members using data collected under constant pressure …
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