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 60 for “"thin shell"”.
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Thin-shell Concrete Floors for Sustainable Buildings
… material in a typical building exists within the floors, making these a prime target for material reductions. This dissertation shows that thin shell concrete floors are a viable alternative to typical slabs and beams in multi-storey buildings. Switching the dominant structural behaviour …
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Optimally stiffened thin shell structures in 3D printing.
Thin shell structures have been widely applied in crafts, art, industry, architecture, aerospace, etc. The dilemma in printing thin shell structures is the balance between material efficiency and structural soundness. The use of more material will produce a more solid and sound structure but it …
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Development of a Reusable Thin-Shell Concrete Flooring System
… fan vault geometry, the segmented fan concrete shell consists of thin-shell glass fibre reinforced concrete elements which thrust against each other to maintain its structural form without any mortar. Form-finding, analysis, and digital fabrication processes were developed for the system. …
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Thin shell foundations: Embodied carbon reduction through materially efficient geometry
… at the expense of time. This research proposes shell foundations in lieu of spread foundations, drawing from historical applications such as Félix Candela’s Customs Warehouse, built in 1953. Shells distribute loads more efficiently through their cross-section, reducing the quantity of material …
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Thin shell and new invariant elements by hybrid stress method
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1983.
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Detailed thermal analysis of a thin-shell, spherical radiometer in Earth orbit
An.exact energy balance is conducted on a spherical thermal radiation detector. The thermal radiation heat transfer to the spherical detector is computed utilizing models of the surface optical properties that vary with surface temperature, wavelength and angle of incidence. Studies have been …
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New thin shell silica particles and HILIC phases for liquid chromatography: synthesis, characterisation and functionalisation
… porous particles with a solid core and a porous shell (also known as fused core, core-shell or porous shell) for fast and highly efficient separation of low molecular weight solutes to large and complex analytes, while avoiding excessive back pressure. In this work, four different sub-2µm thin …
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Multilevel, subdivision-based, thin shell finite elements: development and an application to red blood cell modeling
… numerical simulation of the deformation of thin walled structures. We address the need to characterize and improve the performance of the subdivision thin shell finite element for practical applications in engineering design and analysis. The contribution of this document is to provide a …
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Nervi's design and construction methods for two thin-shell structures : the Leverone Field House and Thompson Arena
This thesis studies two major thin-shell concrete structures by Pier Luigi Nervi (1891- 1979) - the Leverone Field House and Thompson Arena. These two similar parabolic vaults are two of the few international structures he has completed in the United States. Situated across the street from each …
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Experiments and numerical analysis on air bearing slumping of segmented thin-shell mirrors for X-ray telescopes
Slumping (or thermal shaping) of thin glass sheets onto high precision mandrels was used by NASA Goddard Space Flight Center to fabricate the NuSTAR telescope with success. But this process requires long thermal cycles and produces mid-range spatial frequency errors due to the anti-stick mandrel …
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A theoretical model of the cornea as a thin shell of variable thickness in relation to radial keratotomy
… The general elasticity equations describing a thin shell of variable thickness are solved using finite difference techniques. To gain insight into the natural corneal structure, the constant thickness case is compared to one of normal thickness. The bending stresses are found to influence the …
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An experimental investigation into the effectiveness of steel fibre-reinforced concrete relative to conventional mesh-reinforced concrete in thin shell construction
This report presents the results of an investigation into the suitability of steel-fibre reinforced concrete (SFRC) as a building material. The performance of the SFRC is gauged relative to conventional steel mesh-reinforced concrete. The report begins with the historical background of …
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Isogeometric Design, Analysis and Optimisation of Lattice-Skin Structures
… structures are a class of structures that couple thin-shells with lattices, which potentially combine the advantages of the thin-shell and the lattice structure. A new and systematic isogeometric analysis approach that integrates the geometric design, structural analysis and optimisation of …
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The acoustics of curved and lined cylindrical ducts with mean flow
… model is illposed. By considering a metal thin-shell boundary, this illposedness is explained, and stability analysed using the Briggs–Bers criterion. The stability of a cylindrical thin shell containing compressible fluid is shown to differ significantly from the stability for an …
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Vibrações de cascas cilíndricas delgadas contendo fluido
… dynamic interaction occuring between fluid and thin cylindrical shells, which result from a strong coupling among the vibration modes, are presented herein. Emphasis is given to the used experimental techniques and obtained test results which have corroborated recently reported theoretical …
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Response of thin circular plates to central blast loading
… ductile deformation response and rupture of thin 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 …
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School bus crashworthiness
… a higher order integration was done for all the thin shell elements with Hughes-Liu SR thin shell elements. LS-TAURUS was used to post process the results obtained from the simulation. The results from the analysis included nodal displacement, velocity and accelerations, energy absorption, rigid …
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A doubly-curved finite element analysis of thin arbitrary shell structures
… with the linear elastic static analysis of thin arbitrary shell structures by the use of the displacement approach finite element method. The various factors involved in selecting a shell finite element are discussed. A comprehensive formulation of a 27 degree of freedom, arbitrary, …
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Coupled Thermal-Mechanical Fixed-Grid Finite-Element Model With Application to Initial Solidification
… and stress development in a solidifying steel shell during the initial stage of continuous casting. This verified model is applied to predict the distorted shape of a vertical section through the solidifying shell, during a sudden fluctuation in liquid level at the meniscus. The results show …
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