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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 “"shell theory."”.
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The Energy Method in Cylindrical Shell Theory
Made available in DSpace on 2014-12-04T23:10:47Z (GMT). No. of bitstreams: 1 0003991.pdf: 1336279 bytes, checksum: 5686d2b9b8ae301c6b39c29577ffaf5b (MD5) Previous issue date: 1952
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Geometrically nonlinear analysis of composite laminates using a refined shear deformation shell theory
The theory is based on an assumed displacement field, in which the surface displacements are expanded in powers of the thickness coordinate up to the third order. The theory allows parabolic description of the transverse shear stresses, and therefore the shear correction factors of the usual shear …
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On a moderate rotation theory for anisotropic shells
… present work discusses 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 …
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Geometrically nonlinear analysis of layered anisotropic plates and shells
… analysis of layered composite plates and shells is demonstrated via several example problems. For comparison purposes, a two-dimensional finite element based on the Sanders shell theory with the von Karman (nonlinear) strains is also presented. The elements have the following features: • …
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A Theory for Wheezing in Lungs
… of this thesis is to change this, developing a theory for the onset of wheezing using both experimental and analytical approaches, with implications for both scientific understanding and clinical diagnosis. Wheezing is caused by a fluid structure interaction between the airways and the air …
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Energy levels in light nuclei
The recent application of the shell model theory to the energy level structure of light nuclei has made apparent a lack of experimental data concerning these nuclei. The impossibility of accurately criticizing the theory on the basis of available experimental results has made imperative new …
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Analysis of a hyperbolic paraboloid
… Paraboloid has become a popular form for roof shells. In this thesis a comprehensive method was presented for the analysis of a hyperbolic paraboloid surface with curved edges. Its reliability is verified by comparing the analytical and experimental results of displacements of a thin shell …
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Capillary flows in flexible structures
… in different regimes and compared with a shell theory model. Good agreement is found between experiments and theory overall. Analysis and experimental results show that despite the complex and non-axisymmetric deformed shapes of cylindrical structures, the elastocapillary length used in …
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Analysis of Pressurized Arch-Shells
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 …
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In-plane vibrations of a transversely isotropic arch
… composite arch is developed from classical shell theory. The problem is reduced from a shell to an arch by making an assumption that the variation of the field of variables in the direction of the width of the arch is small compared to those in other directions. Standard separation of …
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Free vibration and stability of complete orthotropic circular toroidal shells
… of complete orthotropic circular toroidal shells. It is conducted in four main parts. A literature survey is first carried out indicating the new and continuing uses of toroidal shells in engineering structures. Secondly, theory is developed for the free vibration analysis of toroidal …
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Geometric and material nonlinear analysis of laminated composite plates and shells
… model for laminated composite plates and shells is formulated and incorporated into a finite element model that accounts for both geometric nonlinearity and transverse shear stresses. The elasto-plastic material behavior is incorporated using the flow theory of plasticity. In particular, …
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Vibration of stressed shells of double curvature
Shells of double curvature are common structural elements in aerospace and related industries, but due to the complexity of their configurations and governing equations, little has been done to classify their general dynamic behavior. The subject of this dissertation is the determination of the …
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Formulation and implementation of conforming finite element approximations to static and eigenvalue problems for thin elastic shells
… finite element analyses of static thin elastic shell problems, the French mathematician Ciarlet (1976) proposed an approach to the formulation of such problems. The formulation he uses is based on classical shell theory making use of Kirchhoff-Koiter assumptions. The shell problem is posed in …
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Asymptotic analysis of vibrations of thin cylindrical shells
… involving vibrations of thin cylindrical shells by means of symbolic computation is presented. The algorithm is based on the method of asymptotic integration of the vibration equations of thin shells, developed by Goldenveizer, Lidsky and Tovstik. A linear shell theory of the …
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Vibration Analysis and Control of an Inflatable Toroidal Satellite Component Using Piezoelectric Actuators and Sensors
… with theoretical formulations. We use Sanders' shell theory to derive the governing equations of motion for a shell subjected to pressure. To take into account the prestress effects of internal pressure, we use geometric nonlinearity, and to model the follower action of pressure force, we …
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Response of thin circular plates to central blast loading
… sheet elements are used to model the plate. The shell element uses a theory that includes shear deformation effects but degenerates to the Kirchoff classical thin shell theory for thin shell elements. An explicit time integration scheme is considered more suitable than an implicit scheme for the …
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Multimode Nonlinear Vibration Analysis of Stiffened Functionally Graded Double Curved Shells in a Thermal Environment
… nonlinear response of stiffened double curved shells made of functionally graded materials under thermal loads. The formulation is based on the first order shear deformation shell theory in conjunction with the von Kármán geometrical nonlinear strain-displacement relationships. The nonlinear …
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Aquatecture : underwater dwellings and sea born structures as paradigms of design
… structure design/analysis method which uses thin shell theory to reliably approximate the behavior of thick shells is presented through both simple and complex examples. The volume concludes with a metamorphosis of sea dwelling concepts in the form of original sketches, technical drawings and tone …
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