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 21 for “"Spherical shells"”.
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Creep buckling of spherical shells.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Free and Forced Vibrations of Spherical Shells
Made available in DSpace on 2014-12-08T23:56:30Z (GMT). No. of bitstreams: 1 6604328.pdf: 4844999 bytes, checksum: b496ec2a412a51945223c7e61396c7ca (MD5) Previous issue date: 1965
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The electrostatic energies of some distorted spherical shells
… of the electrostatic energies of some charged spherical shells distorted symmetrically about an axis by functions of the zonal harmonics. Coincidentally, the surface areas of several such istorted spheres are obtained
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The Elastic Response of Spherical Shells to Blast Waves
Made available in DSpace on 2014-12-08T23:56:16Z (GMT). No. of bitstreams: 1 6503607.pdf: 4168969 bytes, checksum: 576f7a5f8b5f84c7da4e77c81672d760 (MD5) Previous issue date: 1964
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Mathematical analysis of stress and displacement in thin shallow spherical shells
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Civil Engineering, 1946.
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Fabrication and buckling of thin spherical shells containing precise geometric imperfections
… revisit the classic problem of buckling of thin spherical shells under uniform pressure and explore the effect that geometric imperfections can have on their buckling behavior. Since the 1960s, numerous theoretical and computational studies have addressed the imperfection sensitivity of buckling …
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A Numerical Analysis of the Dynamic Response of Thin Elastic Spherical Shells
Made available in DSpace on 2014-12-05T17:37:07Z (GMT). No. of bitstreams: 1 6000212.pdf: 3007411 bytes, checksum: 365913d69becd2581e29e3837b888cd1 (MD5) Previous issue date: 1959
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An analysis procedure for cylindrical and spherical shells subjected to multi-harmonic loads
The analysis of shells of revolution subjected to complicated multi-harmonic surface loads is a very complex problem. Although several techniques exist for the solution of complex shell problems, all of these techniques present certain difficulties which make them impractical for use with complex …
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Axisymetric vibrations of homogeneous and sandwich spherical shells with a hole at the center
… equations of motion are derived for elastic spherical shells. Most of the analysis is focused on the free axisymmetric vibrations of homogeneous and sandwich shallow spherical shells. The nonlinear behavior, which allows for small deflections, is also discussed. The linear vibrations of …
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An analysis of buckling in spherical shells and its design implications for hopper poppers
… rubber toy in the shape of a hemispherical shell that stores elastic potential energy when inverted. There is new interest for hopper poppers in projectile toys. However, the force it takes to invert the popper can easily exceed what child can produce. In the course of the study, …
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A computational and experimental study of the underwater implosion of single and multiple metallic spherical shells
… the implosion behavior of single and multiple spherical shells. Over the course of this research, I designed and predicted the collapse depth of metallic spherical volumes using shell buckling theory, then used a computational tool to model several implosion scenarios of both single and …
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The effect of welding on the buckling behaviour of spherical shells : a review and some numerical results
The purpose of this thesis is to give first a brief review in the area of shell stability with special focus on the effect of imperfections due to the welding process on the buckling behaviour of shell structures.
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Comparison Theorems in Elliptic Partial Differential Equations with Neumann Boundary Conditions
… Specifically, we prove comparison theorems on spherical shells, spheres, and hemispheres, showing that under rearrangement of the data, the solution's convex mean increases. We also obtain similar weighted comparison results in balls.</p>
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Approximation of random/stochastic partial differential equations
… different problems: a study of random fields on spherical shells, and its applications to PDE problems; quasi-Monte Carlo (QMC) methods for a class of PDEs with random coefficients; and a discretisation for the solution of stochastic PDEs. First, we consider Gaussian random fields on spherical …
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On a moderate rotation theory for anisotropic shells
… a new moderate rotation theory for anisotropic shells, proposed by Schmidt and Reddy. All aspects of the derivations are explicitly covered and a finite element formulation of the theory is developed for the solution of test cases. Specific forms of the equations for rectangular plates, …
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Bolted flanged connections made of fiber reinforced plastic materials
… to establish design formulas for cylindrical and spherical shells, little work has been done to investigate bolted flanged connections. The ASME Boiler and Pressure Vessel Code or the codes of other industrialized countries do not include specific rules for the design of FRP bolted flanged …
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Modal interactions in shell dynamics
… response of infinitely long circular cylindrical shells to an external harmonic excitation. The excitation frequency is near the linear natural frequency of the breathing mode (i.e., primary resonance of the breathing mode) and the linear natural frequency of the breathing mode is approximately …
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Experimental and modeling analysis of near-field scattering from complex targets
… targets and subcritically insonifying an empty spherical shell. Specifically, the arrival times of different waves known to be generated by scattering from cylindrical and spherical shells have been computed at different azimuths and vertical angles. These traces have been obtained by analyzing …
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Fast Monte Carlo Simulation of ⁹⁰Y Bremsstrahlung using a Kernel-based Photon Source
… three main parts. First, a ⁹⁰Y point source in a spherical water phantom is fully simulated using Monte Carlo simulation. The characteristics of the bremsstrahlung photons produced from the ⁹⁰Y decay are investigated. The full Monte Carlo simulation of ⁹⁰Y point source provides the relationships …
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Convection and Magnetic Field Generation in Rotating Spherical Fluid Shells
… and dynamo action in rotating fluid spheres and spherical shells. This research is motivated by the geophysical problem of the origin and properties of the Earth's magnetism. Extensive numerical simulations are performed in order to advance the understanding of the basic physical components and …
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