Análise não linear física de placas e cascas anisotrópicas laminadas acopladas ou não com meio contínuo tridimensional viscoelástico através da combinação entre o MEC e o MEF / Physical non-linear analysis of anisotropic laminated plates and shells coupled or not with three-dimensional viscoelastic medium by BEM/FEM coupling

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

This work presents an anisotropic laminated stiffened shell formulation, considering physical non-linearity with non-associative law, coupled to viscoelastic three-dimensional continuum medium. Plane triangular finite elements with cubic approximation for nodal variables are developed to model the shell. Bar elements with the same approximation are derived for the general bar element. Laminated kinematics is used for both elements, making possible the representation of eccentrically stiffened structures and the consideration of composed elements with different properties and thickness for each layer. Therefore, the formulation is applicable for a large number of problems. In order to model plasticity in shell, the Tsai-Wu criterion for general anisotropic materials is adopted. Closed expression for the plastic multiplier using non-associative law is founded. For bars, uniaxial criterion is considered, and shear contribution for plasticity is neglected. For these elements, the use of multilinear stress x strain relation is developed. The viscoelastic continuum is modeled by triangular boundary elements with linear approximation of variables. The fundamental solutions of Kelvin and Mindlin are presented and implemented. The coupling is made by the equivalent stiffness matrix method, making possible a direct contribution of the BEM matrix on the FEM stiffness matrix. General examples are presented to verify and validate the proposed formulation

ASSUNTO(S)

soil-structure interaction interação solo-estrutura finite element bem/fem coupling laminated structures elementos de contorno boundary element elementos finitos viscosity estruturas laminadas plasticity acoplamento mec/mef plasticidade viscosidade

ACESSO AO ARTIGO

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