Shallow Shells
Mostrando 1-12 de 13 artigos, teses e dissertações.
-
1. First inventory of benthic mollusks associated with the reef ecosystems of Morro de São Paulo on Tinharé Island in northeastern Brazil
Resumo: Os ecossistemas recifais do Morro de São Paulo estão na área de proteção ambiental Tinharé-Boipeba, a qual foi estabelecida em 1992 no estado da Bahia, Brasil. Apesar desta área ter sido criada há mais de duas décadas, nenhum estudo foi realizado sobre a biodiversidade de invertebrados associados a tais ecossistemas recifais. Este trabalho r
Biota Neotrop.. Publicado em: 10/10/2019
-
2. An efficient general curvilinear coordinates finite element method for the linear dynamic study of thickness-independent shells
Abstract yyTo date, a large number of finite element methods have been developed to study the dynamics of shell structures. Most of them are generally based on the degenerated solid approach and other less in shell theories, but introducing, in this last case, some assumptions to analyze this problem: some of them refer to shallow shells (slightly curved she
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
-
3. Vibration analysis of laminated functionally graded shallow shells with clamped cutout of the complex form by the Ritz method and the R-functions theory
Abstract The R-functions theory and Ritz approach are applied for analysis of free vibrations of laminated functionally graded shallow shells with different types of curvatures and complex planforms. Shallow shells are considered as sandwich shells of different types: a) face sheets of the shallow shells are made of a functionally graded material (FGM) and t
Lat. Am. j. solids struct.. Publicado em: 18/02/2019
-
4. Analysis of Geometrically Nonlinear Vibrations of Functionally Graded Shallow Shells of a Complex Shape
Abstract Geometrically nonlinear vibrations of functionally graded shallow shells of complex planform are studied. The paper deals with a power-law distribution of the volume fraction of ceramics and metal through the thickness. The analysis is performed with the use of the R-functions theory and variational Ritz method. Moreover, the Bubnov-Galerkin and the
Lat. Am. j. solids struct.. Publicado em: 2017-09
-
5. Nonlinear Vibration and Mode Shapes of FG Cylindrical Shells
Abstract The nonlinear vibration and normal mode shapes of FG cylindrical shells are investigated using an efficient analytical method. The equations of motion of the shell are based on the Donnell’s non-linear shallow-shell, and the material is assumed to be gradually changed across the thickness according to the simple power law. The solution is provided
Lat. Am. j. solids struct.. Publicado em: 2017-03
-
6. Large amplitude free vibration of orthotropic shallow shells of complex shapes with variable thickness
The present formulation of the analysed problem is based on Donell's nonlinear shallow shell theory, which adopts Kirchhoff's hypothesis. Transverse shear deformations and rotary inertia of a shell are neglected. According to this theory, the non-linear strain-displacement relations at the shell midsurface has been proposed. The validity and reliability of t
Lat. Am. j. solids struct.. Publicado em: 2013-01
-
7. Influence of physical and geometrical system parameters uncertainties on the nonlinear oscillations of cylindrical shells
This work investigates the influence of physical and geometrical system parameters uncertainties and excitation noise on the nonlinear vibrations and stability of simply-supported cylindrical shells. These parameters are composed of both deterministic and random terms. Donnell's non-linear shallow shell theory is used to study the non-linear vibrations of th
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
-
8. Análise de cascas abatidas de materiais compósitos laminados simétricos usando o método dos elementos de contorno / Analysis of shallow shells of symmetric composite laminated materials using the boundary element method
Este trabalho apresenta uma formulação do método dos elementos de contorno para o cálculo de deslocamentos em cascas abatidas de materiais compósitos laminados simétricos. A formulação desenvolvida baseia-se no acoplamento da formulação de elasticidade plana (formulação de membrana) e da formulação de placas finas (placas de Kirchhoff ou teoria
Publicado em: 2011
-
9. MODELOS DE DIMENSÃO REDUZIDA PARA ANÁLISE DAS OSCILAÇÕES NÃO-LINEARES E ESTABILIDADE DE CASCAS CILÍNDRICAS / LOW DIMENSIONAL MODELS FOR NONLINEAR VIBRATION ANALYSIS AND STABILITY OF CYLINDRICAL SHELLS.
The nonlinear vibrations and stability of a fluid-filled cylindrical shell is investigated using reduced order models. First, the nonlinear equations of motion of the cylindrical shell are deduced based on the expressions for the potential and kinetic energy, which are obtained using Donnell shallow shell theory. The internal fluid is considered to be irrota
Publicado em: 2008
-
10. Transient stability of empty and fluid-filled cylindrical shells
In the present work a qualitatively accurate low dimensional model is used to study the non-linear dynamic behavior of shallow cylindrical shells under axial loading. The dynamic version of the Donnell non-linear shallow shell equations are discretized by the Galerkin method. The shell is considered to be initially at rest, in a position corresponding to a p
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
-
11. Boundary element formulation for shallow shell analysis / Formulação do método dos elementos de contorno para análise de cascas abatidas
O presente trabalho trata da análise numérica de cascas abatidas com o uso do método dos elementos de contorno (MEC). A formulação é desenvolvida a partir do acoplamento entre as equações integrais para flexão de placas delgadas e para estado plano de tensão. No esquema implementado, os termos sobre o contorno são avaliados a partir de processos a
Publicado em: 2006
-
12. Oceanographical Geoquinica of sedimentary carbonates of the continental platform of the state of the Cearà and implications / Geoquimica de carbonatos sedimentares da plataforma continental do estado do Cearà e implicaÃÃes oceanogrÃficas
Eight foraminÃfera-rich sediment samples of the continental margin of Brazil, between the states of Cearà and Pernambuco and single foraminifera specimens (Amphistegina radiata, Peneropolis planatus and Globigenrinoides rubbe) of fifty sediment samples collected in the continental margin of the Ceara State were analysed for C and O- isotope. The objective
Publicado em: 2004