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Dissertations / Theses on the topic 'Shells'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Scott, Joline L. "Shells." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1285194565.

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2

Caresta, Mauro Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Structural and acoustic responses of a submerged vessel." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/44404.

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Excitation of the low frequency vibrational modes of a submerged vessel can generate significant radiated noise levels. Vibrational modes of a submarine hull are excited from the transmission of fluctuating forces through the shaft and thrust bearings due to the propeller rotating in an unsteady fluid. The focus of this work is to investigate the structural and acoustic responses of a submarine hull under axial excitation. The submarine hull is modelled as a cylindrical shell with internal bulkheads and ring stiffeners. The cylindrical shell is closed by truncated conical shells, which in turn

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3

Loukaides, Evripides George. "Elementary morphing shells." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/269724.

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Multistable shells are not yet completely understood. Even under the widespread Uniform Curvature (UC) assumption, the limits of this behaviour have not been established and the influence of individual material and geometric parameters has not been described conclusively; this research explores these open questions. In addition, this project was motivated by the need for practical design guidelines and the pursuit of alternative construction and actuation methods for multistable shells. Our analysis is based on an expression for the strain energy of a shell under a set of simplifying assumptio

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4

McDaniel, James Gregory. "A new higher-order shell theory for vibration and viscoelastically-coated circular cylindrical shells." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15825.

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5

Li, Jian-Min [Verfasser], and Jan [Akademischer Betreuer] Knippers. "Timber shell structures : form-finding and structural analysis of actively bent grid shells and segmental plate shells / Jian-Min Li ; Betreuer: Jan Knippers." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1138234893/34.

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6

Sadr-Hashemi, Farshid. "Buckling of conical shells." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685403.

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7

Htet, Aung Thu. "Full-body Shell Creation for CAD Virtual Humans including Tightly-Spaced, Enclosed Shells." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-theses/1264.

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Computational human models have become essential in several different biomedical and electrical engineering research areas. They enable scientists to study, model, and solve complex problems of human body responses to various external stimuli including electromagnetic and radio-frequency signals. This study describes the algorithms and procedures of creating multi-tissue full-body Computer-Aided Design (CAD) human models. An emphasis is made on full-body shells of variable thicknesses, e.g. skin, fat, and average body container shells. Such shells, along with internal organs, are useful for mu

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8

Kolahi, Abdolahad Salehi. "Co-rotational methods for small and large strain beams, sheets and shells." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299133.

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9

Shin, Haksik. "Nonlinear analysis of axisymmetric shells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0017/MQ58505.pdf.

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10

Oudmaijer, René Dick. "Evolved stars with circumstellar shells." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1995. http://irs.ub.rug.nl/ppn/141387866.

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11

Zhao, Jiabin. "Natural theory of nonlinear shells." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40299.

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This thesis is devoted to the analysis of nonlinear shell problems. First, using the tangential differential calculus and the oriented boundary distance function, we derive two intrinsic nonlinear models for thin/shallow shells made up of a Saint Venant-Kirchhoff material or a homogeneous, isotropic, elastic material. The models extend the natural theory of plates to thin/shallow shells. Next, we prove the regularity property for the solutions of the linear model, and differentiability of the nonlinear operators associated with the nonlinear models in the given spaces. Finally, we prove existe

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12

Ifayefunmi, Olawale Friday. "Combined stability of conical shells." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569897.

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This thesis is concerned with the study of the elastic-plastic buckling of short and relatively thick conical shells subjected to combined loading, i.e., axial compression and external pressure acting simultaneously. This is both numerical and experimental study. Within the context of numerical study, a nonlinear finite element calculations were carried out in order to obtain: (i) the failure loads of cones under axial compression only, external pressure only and under combined loading, (ii) the spread of plastic strain and the effect of strain hardening of the material on failure loads, and (

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13

Lee, S. J. "Analysis and optimization of shells." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637865.

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Three computer programs are written, implemented and tested in this study: (a) shell finite element analysis program, LFEAP, for linear static, free vibration and geometrically nonlinear analyses, (b) a shape and size optimization program, LIBRA-DS, based on mathematical programming methods, and (c) a topology optimization program, LIBRA-OTS, based on optimality criteria method with layered artificial material model. A rigorous study of various shell element formulations is presented. In particular, an assumed natural strain shell element is developed and two well-known and reliable shell elem

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14

Strutt, Jonathan Howard. "Spherical thin shells in relativity." Thesis, University of York, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258371.

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15

Mesnil, Romain M. Eng Massachusetts Institute of Technology. "Stability of elastic grid shells." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82716.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 83-86).<br>The elastic grid shell is a solution that combines double curvature and ease of mounting. This structural system, based on the deformation of an initially at grid without shear stiffness was invented more than fifty years ago. T

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16

Smits, Derck Peter. "Atomic processes in nova shells." Doctoral thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/16000.

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Bibliography: pages 155-165.<br>The unusual spectra of the spatially-resolved nova shells of DQ Her, T Aur and CP Pup are reviewed. Because calculations for these conditions have not been made, recombination models of HI, HeI and CNO from a neutral to a doubly ionized state were constructed. The models are described and the results presented for densities at various temperatures. A photoionization model is also described. The effects of non-uniform density distributions in nova shells have been investigated and the observational consequences discussed. A model of the CP Pup shell is described

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17

Goh, Julian Kok Seng. "Analysis of Pressurized Arch-Shells." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/35576.

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A pressurized arch-shell structural component made of flexible material is considered. The component is inflated with high internal pressure. The behavior of similar types of structures, such as a pair of leaning pressurized arches and pressurized arch-supported membrane shelters, has been investigated in the past. More recently, several types of pressurized structures have been incorporated as part of the framework for a variety of structural systems. Particularly, the U.S. Army has been investigating the use of large lightweight and transportable pressurized arch-shell structures to be

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18

Mohamedien, Mohamed Ahmed. "The buckling of grid shells." Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254000.

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19

Chebili, Rachid. "The boundary support of shells." Thesis, University of Bath, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279412.

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20

Al, lawati Hussain Ali Redha Mohammed. "The buckling of axially compressed cylindrical shells under different conditions." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25723.

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Civil Engineering thin cylindrical shells such as silos and tanks are normally subjected to axial compression that arises from a stored solid, wind, earthquake, self-weight or roof loads. The walls of these shells are very thin, generally of the order of 6 to 25 mm, and massively less than the radius, which is typically 5 to 30 m. They are thus very thin shell structures, like those of rockets, spacecraft, motor vehicles and aircraft. The commonest failure mode is elastic buckling under axial compression. It has long been known that the buckling strength of a thin cylindrical shell under axial

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21

Drachuk, Irina. "Cytocompatible coatings to control cell activity." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52220.

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Cell-surface engineering has been attracting increased interest in the field of biotechnology, tissue engineering, cell therapy, or biosensors/bioelectronics. Thin nanocoatings or sometimes referred as nanoshells allow for modifying and controlling variety of cell properties, specifically retardation of cell division or growth, masking immunological properties, providing chemical and mechanical resistance to external stressors, and ability to further functionalize shells in order to guide cells attachment, their proliferation and function in artificial environment. Bottom-up approach, utiliz

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22

Willoughby, David Scott. "An Investigation into Isogeometric Blended Shells." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6565.

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Improvements to isogeometric blended shells are introduced which blend traditional Reissner-Mindlin shells, and Kirchhoff-Love shells, with an exact interpolation of the shell director increment. A gradient extraction operator is introduced which allows derivatives of basis functions to be exactly expressed as a linear combination of the basis functions themselves. Several benchmarks are investigated and the new blended shell is compared with different shell elements in ABAQUS and NASTRAN. In addition, the effect of different quadrature schemes is included in the comparisons. The new isogeomet

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23

Glandier, Christian Y. "Wave-vector analysis of the vibrations of thin cylindrical shells." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/16797.

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24

Shaw, Christopher Edward. "The effects of imperfections on the acoustic scattering of a coated shell." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/17903.

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25

Garcia, Gonzalez Ferran. "Thermal convection in rotating spherical shells." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/285778.

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The study of thermal convection in rotating spherical geometry is fundamental to explain many geophysical and astrophysical phenomena such as the generation of the magnetic fields, or the differential rotation observed in the atmospheres of the major planets. The difficulties associated with the experimental studies enhance the importance of the three-dimensional numerical simulations, such as those presented in this dissertation. In order to obtain the evolution equations, the Boussinesq approximation is applied to the mass, momentum and energy conservation equations, which are rewritten in

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26

Lorenzani, Silvia. "Fluid instabilities in precessing ellipsoidal shells." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964398702.

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27

Olcay, Yasemin. "Progressive Failure Analysis Of Composite Shells." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614202/index.pdf.

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The objective of this thesis is to investigate the progressive failure behavior of laminated fiber reinforced composite shell structures under different loading conditions. The laminates are assumed to be orthotropic and the first order shear deformation theory is applied. Three-node layered flat-shell elements are used in the analysis. To verify the numerical results obtained, experimental and analytical results found in literature are compared with the outputs of the study, and the comparison is found to have shown good agreement with the previous work. Rectangular graphite/epoxy composite l

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28

Mseikeh, Camille Hanna. "Wrinkling of membranes, plates, and shells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30343.pdf.

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29

Molster, Frans Johan. "Crystalline silicates in circumstellar dust shells." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/91412.

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30

Zhong, Hongzhi. "Behaviour of shells under localised impact." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308648.

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31

Holst, J. M. F. G. "Large deflection phenomena in cylindrical shells." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604195.

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In the past, much research effort has been directed towards the problem of buckling of thin cylindrical shell structures under axial loading. Thus far, however, no wholly satisfactory solutions have been attained. In this thesis a new approach to shell buckling is proposed. It is suggested that a careful examination of a heavily deformed shell structure in the post-buckling regime - and the processes leading up to this state of deformation - may clarify some of the principles involved in its loss of stability. The complex deformation patterns can be reduced to a more elementary description con

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32

Randall, Richard John. "Fluid-structure interaction of submerged shells." Thesis, Brunel University, 1990. http://bura.brunel.ac.uk/handle/2438/5446.

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A general three-dimensional hydroelasticity theory for the evaluation of responses has been adapted to formulate hydrodynamic coefficients for submerged shell-type structures. The derivation of the theory has been presented and is placed in context with other methods of analysis. The ability of this form of analysis to offer an insight into the physical behaviour of practical systems is demonstrated. The influence of external boundaries and fluid viscosity was considered separately using a flexible cylinder as the model. When the surrounding fluid is water, viscosity was assessed to be signifi

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33

Timarci, Taner. "Vibrations of composite laminated cylindrical shells." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283227.

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34

Haynie, Waddy. "Torsion of Elliptical Composite Cylindrical Shells." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/28547.

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The response of elliptical composite cylindrical shells under torsion is studied. The torsional condition is developed by rotating one end of the cylinder relative to the other. Prebuckling, buckling, and postbuckling responses are examined, and material failure is considered. Four elliptical cross sections, defined by their aspect ratio, the ratio of minor to major radii, are considered: 1.00 (circular), 0.85, 0.70, and 0.55. Two overall cylinder sizes are studied; a small size with a radius and length for the circular cylinder of 4.28 in. and 12.85 in., respectively, and a large size with ra

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35

Saizar, Pedro. "Multiwavelength studies of classical nova shells /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780865408208.

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36

Keene, Frank W. "Thermal stresses in closed spherical shells /." Online version of thesis, 1991. http://hdl.handle.net/1850/11039.

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37

Trevor, Simon. "Dimensional accuracy of investment casting shells /." [St. Lucia, Qld.], 2000. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16943.pdf.

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38

Hu, Bin. "Stability analysis of linear thin shells." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7360/.

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Shell structure is widely used in engineering area. The purpose of this dissertation is to show the behavior of a thin shell under external load, especially for long cylindrical shell under compressive load, I analyzed not only for linear elastic problem and also for buckling problem, and by using finite element analysis it shows that the imperfection of a cylinder could affect the critical load which means the buckling capability of this cylinder. For linear elastic problem, I compared the theoretical results with the results got from Straus7 and Abaqus, and the results are really close. For

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39

Rémillard, Olivier. "Embedded thin shells for wrinkle simulation." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119548.

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We present a new technique for simulating high resolution surface wrinkling deformations of composite objects consisting of a soft interior and a harder skin. We combine high resolution thin shells with coarse finite element lattices and define frequency based constraints that allow the formation of wrinkles with properties matching those predicted by the physical parameters of the composite object. Our two-way coupled model produces the expected wrinkling behavior without the computational expense of a large number of volumetric elements to model deformations under the surface. We use C1 qu

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40

ALEMAN, ROMAN AUGUSTO ARCINIEGA. "STABILITY ANALYSIS OF LAMINATED COMPOSITE CYLINDRICAL SHELLS AND PANELSSTABILITY ANALYSIS OF LAMINATED COMPOSITE CYLINDRICAL SHELLS AND PANELS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1946@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Este trabalho apresenta um estudo do comportamento não- linear e instabilidade de cascas e painéis cilíndricos laminados de materiais compósitos. Com esta finalidade é desenvolvida uma formulação de alta ordem de deformação cisalhante que leva en conta estes efeitos nas relações deformação-deslocamento. O comportamento da casca é descrito por uma consistente teoria não-linear para cascas laminadas que considera pequenas deformações e rotações moderadas e incorpora automaticamente o efeito das deformações cisalhantes. O modelo

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41

Xu, Bo. "Vibration and stability analysis of toroidal shells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ45257.pdf.

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42

Kwok, Raymond Moon Keung. "Mechanics of damaged thin-walled cylindrical shells." Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/993/.

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43

Mustafa, B. A. J. "Free vibration analysis of stiffened circular shells." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/14141.

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This thesis is concerned with the free vibration analysis of stiffened circular cylindrical and conical shells. The study was carried out with a view to improving the accuracy and efficieny of various modelling techniques for the prediction of the stiffened shells natural frequencies and mode shapes. A review of the existing literature covering various aspects of the shell vibrations problem and modelling techniques has been given at the beginning of each chapter with a critical appraisal of the assumptions made and results obtained. Initially the continuum energy approach was used for the ana

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44

Lemos, Jose Pizarro de Sande. "Shells, discs and homology in general relativity." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254240.

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45

JUNIOR, JOAO BATISTA MARQUES DE SOUSA. "SELF-ADAPTIVITY AND SHAPE OPTIMIZATION OF SHELLS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2050@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Este trabalho consiste no desenvolvimento e implementação de um sistema computacional integrado para Modelagem Geo- étrica, Geração de Malhas, Análise Numérica, Auto- Adaptação do tipo h e Otimização de Forma e Espessura em Cascas. O Modelo Geométrico adotado consiste em representar a superfície por meio de B-Splines Racionais Recortadas, admitindo variação de espessura segundo as mesmas funções que descrevem a superfície. Para a utilização nos módulos de Auto-Adaptação e Otimização, Geradores de Malhas Não-Estruturadas sob

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46

Lawrie, Jane Barbara. "Interaction of sound with cylindrical elastic shells." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47151.

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47

Hiller, Jean-François 1974. "Finite element analysis of shells with layers." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29255.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.<br>Includes bibliographical references (leaves 160-165).<br>It is well established that thin shell structures frequently feature narrow bands of strain concentration and localized displacement irregularities referred to as boundary and internal layers. It is crucial to capture these layers properly as they can be sources of structural failures. Unfortunately, while the absence of analytical solutions to most shell problems of practical interest has spawned the development of a variety of finite eleme

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48

Al-Rashed, Rashed Abdulazeez. "Buckling patterns on pre-stretched bilayer shells." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113759.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 59-63).<br>We introduce a new experimental system to study the effects of pre-stretch on the buckling patterns that emerge from the biaxial compression of elastomeric bilayer shells. After fabricating our samples, releasing the pre-stretch in the substrate by deflation places the outer film in a state of biaxial compression and yields a variety of buckling patterns. We systematically explore the parameter space b

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49

Chang, Jin-Der. "Theory of thick, laminated composite shallow shells /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487779914824542.

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50

Raouf, Raouf A. "Nonlinear forced response of circular cylindrical shells." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101255.

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A combination of the Galerkin procedure and the method of multiple scales is used to analyze the nonlinear forced response of circular cylindrical shells in the presence of internal (autoparametric) resonances. If ω<sub>f</sub> and a<sub>f</sub> denote the frequency and amplitude of a flexural mode and ω<sub>b</sub> and a<sub>b</sub> denote the frequency and amplitude of the breathing mode, the steady-state response exhibits a saturation phenomenon when ω<sub>b</sub> ≈ 2w<sub>f</sub> if the shell is excited by a harmonic load having a frequency Ω near ω<sub>b</sub>. As the amplitude f of the e

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