Free Boundary Problems
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. 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
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2. Effect of Loose Bonding and Corrugated Boundary Surface on Propagation of Rayleigh-Type Wave
Abstract The problems concerns to the propagation of surface wave propagation through various anisotropic mediums with initial stress and irregular boundaries are of great interest to seismologists, due to their applications towards the stability of the medium. The present paper deals with the propagation of Rayleigh-type wave in a corrugated fibre-reinforc
Lat. Am. j. solids struct.. Publicado em: 23/04/2018
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3. On the Free Vibration Analysis of Laminated Composite and Sandwich Plates: A Layerwise Finite Element Formulation
Abstract In this paper, a new higher-order layerwise finite element model, developed earlier by the present authors for the static analysis of laminated composite and sandwich plates, is extended to study the free vibration behavior of multilayer sandwich plates. In the present layerwise model, a first-order displacement field is assumed for the face sheets,
Lat. Am. j. solids struct.. Publicado em: 2017-12
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4. A New Triangular Hybrid Displacement Function Element for Static and Free Vibration Analyses of Mindlin-Reissner Plate
Abstract A new 3-node triangular hybrid displacement function Mindlin-Reissner plate element is developed. Firstly, the modified variational functional of complementary energy for Mindlin-Reissner plate, which is eventually expressed by a so-called displacement function F, is proposed. Secondly, the locking-free formulae of Timoshenko’s beam theory are cho
Lat. Am. j. solids struct.. Publicado em: 2017-06
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5. Pressure-Based and Potential-Based Differential Quadrature Procedures for Free Vibration of Circular Plates in Contact with Fluid
Abstract The differential quadrature method (DQM) has been so far applied to a wide variety of fluid and/or structural problems. The results of many researchers reveal that the DQM is computationally efficient and is applicable to a large class of boundary value problems. However, there is little information about its applications to fluid-structure interact
Lat. Am. j. solids struct.. Publicado em: 2016-04
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6. Size-Dependent Bending, Buckling and Free Vibration Analyses of Microscale Functionally Graded Mindlin Plates Based on the Strain Gradient Elasticity Theory
Abstract In this paper, a size-dependent microscale plate model is developed to describe the bending, buckling and free vibration behaviors of microplates made of functionally graded materials (FGMs). The size effects are captured based on the modified strain gradient theory (MSGT), and the formulation of the paper is on the basis of Mindlin plate theory. Th
Lat. Am. j. solids struct.. Publicado em: 2016-04
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7. Existência e homogeneização para um problema elíptico com fronteira livre não estacionária / Existence and homogenization for an elliptic problem with nonstationary free boundary
In this dissertation we study an elliptic problem in a bounded Lipschitz domain. Part of the boundary is moving and oscillates rapidly in the variable representing the space. Thus, we have a multi-scale free boundary problem. This problem has applications, for instance, in the construction of semiconductor films taking into account that the surface of the fi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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8. A semi-analytical computation of the Kelvin kernel for potential flows with a free surface
A semi-analytical computation of the three dimensional Green function for seakeeping flow problems is proposed. A potential flow model is assumed with an harmonic dependence on time and a linearized free surface boundary condition. The multiplicative Green function is expressed as the product of a time part and a spatial one. The spatial part is known as the
Computational & Applied Mathematics. Publicado em: 2011
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9. Teoria de regularidade para equaÃÃes elÃpticas totalmente nÃo lineares com potenciais singulares e problemas de fronteira livre assintÃticos / Fully nonlinear singularly perturbed elliptic equations and limiting free boundary problems
In this work we develop a fully nonlinear theory for singularly perturbed elliptic equations problems with high energy activation. We esta-blish uniform and optimal gradient estimates of solutions and prove that minimal solutions are non-degenerated. For problems governed by concave equations, we establish uniform weak geometric properties of approximating l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/11/2010
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10. CONVENTIONAL AND SIMPLIFIED-HYBRID BOUNDARY ELEMENT METHODS APLLIED TO AXISYMMETRIC ELASTICITY PROBLEMS IN FULLSPACE AND HALFSPACE / MÉTODOS DE ELEMENTOS DE CONTORNO CONVENCIONAL E HÍBRIDO SIMPLIFICADO APLICADOS A PROBLEMAS AXISSIMÉTRICOS DE ELASTICIDADE NO ESPAÇO COMPLETO E NO SEMI-COMPLETO
This thesis presents the formulation of the conventional and simplified-hybrid boundary element methods for axisymmetric problems, employng fullspace as well as halfspace fundamental solutions. As it is mostly found in the literature on axisymmetric problems in the elastic halfspace, the boundary element formulations make use of fullspace fundamental solutio
Publicado em: 2009
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11. Singular elliptic equations and free boundary problems / Equações elipticas singulares e problemas de fronteira livre
We study the equation -D.u = X{u>O} (log u+Àf(x, u)) in a smooth bounded domain fl C JRn, with boundary conditions u = O on 8fl. We obtain existence and regularity of the maximal solution. The positivity of such a solution depends on the parameter À and on the domain fl. .If the maximal solution vanishes on a set of positive measure, then we obtain local e
Publicado em: 2008
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12. Um metodo Newton-Inexato com estrategia hibrida para globalização / A Newton-Inexact algorithm with a hybrid method for globalization
The main objective of this work is to propose a hybrid globalization strategie for inexact-Newton method. Globalization strategies are based on line search or trust region procedures. In this work, we choose a hybrid strategy which involves a cycle of line search and a variation of Powell dogleg trust region. For solving the linear systems we chose the GMRES
Publicado em: 2007