Thin Shells
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. 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
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2. Analytical study of cylindrical tanks including soil-structure interaction
Resumo Um estudo analítico voltado para o projeto de tanques cilíndricos para armazenagem de líquidos, apoiados sobre fundação deformável, é desenvolvido neste trabalho. O solo sob os tanques é modelado como um meio elástico linear. A parede cilídrica é considerada rigidamente conectada à placa de fundação. Aqui, tanques de concreto são enfati
Rev. IBRACON Estrut. Mater.. Publicado em: 2019-02
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3. Free Vibration Characteristics of the Conical Shells Based on Precise Integration Transfer Matrix Method
Abstract Based on transfer matrix theory and precise integration method, precise integration transfer matrix method (PITMM) is advanced to research free vibration characteristics of the conical shells. The influences of the boundary conditions, the shell thickness and the semi-vertex conical angle on vibration characteristics are discussed. Based on Flügge
Lat. Am. j. solids struct.. Publicado em: 23/04/2018
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4. Investigation of the Energy Absorption Characteristics of Metallic Tubes with Curvy Stiffeners under Dynamic Axial Crushing
Abstract Thin walled multi-cell columns are highly efficient energy absorbers under axial compressions. Multi-cell features are usually obtained by placing stiffeners or ribs to get the required geometry features in the columns. In this study, the curved stiffeners with varying numbers in different configurations are used to support the circular single and b
Lat. Am. j. solids struct.. Publicado em: 2017-08
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5. Investigation of the Energy Absorption Characteristics of Metallic Tubes with Curvy Stiffeners under Dynamic Axial Crushing
Abstract Thin walled multi-cell columns are highly efficient energy absorbers under axial compressions. Multi-cell features are usually obtained by placing stiffeners or ribs to get the required geometry features in the columns. In this study, the curved stiffeners with varying numbers in different configurations are used to support the circular single and b
Lat. Am. j. solids struct.. Publicado em: 2017-08
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6. Free and Forced Vibration Analysis of Stepped Circular Cylindrical Shells with Several Intermediate Supports Using an Extended Wave Method; a Generalized Approach
Abstract A combination of vectorial form of wave method (VWM) with Fourier expansion series is proposed as a new vehicle for free and forced vibration analysis of stepped cylindrical shells with multiple intermediate flexible supports. The flexible supports can include springs with arbitrary properties in the possible directions. Based on Flügge thin shell
Lat. Am. j. solids struct.. Publicado em: 2016-11
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7. Simplified Analytical Approach to Evaluate the Nonlinear Dynamics of Elastic Cylindrical Shells Under Lateral Blast Loads
Abstract This paper presents an analytical solution to predict the nonlinear forced vibrations of elastic thin-walled cylindrical shells under suddenly applied loads. Interest in this problem is motivated by effects due to explosions on fluid-storage metal tanks. The model is based on the energy criterion due to Lagrange, in which the kinematic nonlinear rel
Lat. Am. j. solids struct.. Publicado em: 2016-07
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8. Dynamic behaviors of visco-elastic thin-walled spherical shells impact onto a rigid plate
As a representative structure, ping-pong balls are usually used to study the mechanical properties of thin-walled spherical shells. In a previous study, the dynamic behaviors of ping-pong balls impinged onto a rigid plate were investigated. It was found that the dynamic deformation energy of the balls could be several times higher than that under quasi-stati
Lat. Am. j. solids struct.. Publicado em: 2014
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9. Sound transmission across orthotropic cylindrical shells using third-order shear deformation theory
The objective of this paper is representation of an analytical solution to calculate transmission loss (TL) of an arbitrarily thick cylindrically orthotropic shell, immersed in a fluid medium with a uniform external airflow and contains internal fluids. The shell is assumed to be infinitely long and is excited by an oblique plane wave. The displacements are
Lat. Am. j. solids struct.. Publicado em: 2014
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10. Free vibration analysis of orthtropic thin cylindrical shells with variable thickness by using spline functions
In this study, vibration behavior of orthotropic cylindrical shells with variable thickness is investigated. Based on linear shell theory and applying energy method and using spline functions, free vibration relations are derived for shell with variable thickness and curvature. Frequency parameter and mode shapes are found after solving the frequency Eigenva
Lat. Am. j. solids struct.. Publicado em: 2014
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11. Effects of organic mineral dietary supplementation on production performance and egg quality of white layers
This trial aimed at evaluating the effect of organic trace mineral supplementation of commercial layer diets on productive performance and egg quality. One-hundred-ninety-two Hy Line W36 white 69-w-old layers were distributed into a completely randomized design with three treatments, and eight replicates, with eight birds each. Treatments consisted of a basa
Revista Brasileira de Ciência Avícola. Publicado em: 2008-03
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12. Análise estática e dinâmica de estruturas delgadas de materiais compostos laminados incluindo materiais piezelétricos / Static and dynamic analysis of thin laminated composite structures with piezoelectric materials
Sabe-se que materiais compostos laminados são, hoje em dia, geralmente usados nas indústrias aeronáutica, aeroespacial, naval e outras, principalmente por causa de suas atrativas propriedades se comparadas aos materiais isotrópicos, como alta rigidez/peso, alta resistência, alto amortecimento e boas propriedades relacionadas ao isolamento térmico e ac�
Publicado em: 2008