JOURNALS

Documents published in Scipedia

• A review of some finite element families for thick and thin plate and shell analysis

  E. Oñate

  (1994). Research Report, Nº PI53

  
  

  Abstract

  This paper describes a number of triangular and quadrilateral plate and Shell elements derived via Reissner-Mindlin plate theory and mixed interpolation. It shown how by introducing the adequate constrains the original thick plate element evolve into DK forms adequate for this situations only. This evolution process allows to revisite some classical elements like the Morley triangle and also to derive simple plate and shell triangles and quadrilates with only translational degrees of freedom as nodal variables.

  Abstract
  This paper describes a number of triangular and quadrilateral plate and Shell elements derived via Reissner-Mindlin plate theory and mixed interpolation. It shown how by introducing [...]

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• Adaptive finite element computations of hypersonic inviscid flows around a double ellipsoid.

  T. Fischer, E. Oñate

  (1995). Research Report, Nº PI60

  
  

  Abstract

  This report documents the potential capabilities of adaptive inviscid flow calculations on unstructured meshes in three dimensions using the finite element method. The finite element formulation of the compressible Euler and Navier-Stokes equations is based on a two-step explicit Taylor-Galerkin scheme. Adaptive remeshing is applied to enhance the numerical solution in the vicinity the shocks. Particular emphasis is put on the generation of unstructured tetrahedral meshes as well as in the discussion of estimating the error in the numerical solution. Finally, an application to a well-known 3D high speed flow problem is shown where adaptive remeshing techniques become essential to keep the computational cost within reasonable limits. Its results are compared to some seemingly best reference solutions using other algorithms.    

  Abstract
  This report documents the potential capabilities of adaptive inviscid flow calculations on unstructured meshes in three dimensions using the finite element method. The finite [...]

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• PARAMESH. Two dimensional unstructured parallel mesh generation program

  J. Mestres, E. Oñate, G. Bugeda

  (1995). Research Report, Nº PI61

  
  

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• Finite point methods in computational mechanics

  E. Oñate, S. Idelsohn, O. Zienkiewicz

  (1995). Research Report, Nº PI67

  
  

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• Simulación del choque de vehículos por el método de los elementos finitos. Programa "SIMPACT"

  J. Rojek, E. Oñate, J. Canet

  (1995). Research Report, Nº PI71

  
  

  Abstract

  En este trabajo se presentan las principales características del programa de ordenador “SIMPACT” desarrollado en el Centro Internacional de Métodos Numéricos en Ingeniería de Barcelona para la simulación numérica de problemas de impacto y choque de vehículos. El programa se basa en una formulación de elementos finitos de lámina no lineal incorporando también elementos de sólido y de viga para modelar correctamente todos los componentes resistente típicos de estructuras de vehículos. El programa permite la utilización de algoritmos de integración en el tiempo explícitos incluyendo además modelos constitutivos para materiales compuestos. Los ejemplos que se presentan muestran la aplicación del programa a la deformación de una puerta sometida a un ensayo penetración lateral, el choque frontal de un prototipo de vehículo industrial, y el vuelco de una cabina de autobús.

  Abstract
  En este trabajo se presentan las principales características del programa de ordenador “SIMPACT” desarrollado en el Centro Internacional de Métodos [...]

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• Análisis de procesos de conformado de metales por el método de los elementos finitos. Posibilidades y perspectivas.

  E. Oñate

  (1995). Research Report, Nº PI72

  
  

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• Structural analysis and durability assessment of historical construction using a finite element damage model

  E. Oñate, A. Hanganu, A. Barbat, S. Oller, R. Vitaliani, A. Saetta, R. Scotta

  (1995). Research Report, Nº PI73

  
  

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• Moving least square approximations for solution of differential equations

  R. Taylor, O. Zienkiewicz, E. Oñate

  (1995). Research Report, Nº PI74

  
  

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• Viscous damage model for Timoshenko beam structures

  A. Barbat, S. Oller, E. Oñate, A. Hanganu

  (1995). Research Report, Nº PI77

  
  

  Abstract

  A local damage constitutive model based on Kachanov’s theory is used within a finite element frame and applied to the case of 2D and 3D Timoshenko beam elements. The model takes into account viscous effects, thus allowing damping to be considered in a rigorous way. A damage index based on potential energy criteria, useful in evaluating the behaviour of structures or of parts of structures, is proposed. The procedure is applied to estimate the damage produced by seismic actions in reinforced concrete building structures, whose response is computed by using a non-linear Newmark-type incremental time integration scheme. Three numerical examples are included; one of them compares results obtained by using the proposed model with results of a laboratory test.

  Abstract
  A local damage constitutive model based on Kachanov’s theory is used within a finite element frame and applied to the case of 2D and 3D Timoshenko beam elements. The [...]

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• On the stabilization of numerical solution for advective-diffusive transport and fluid flow problems

  E. Oñate

  (1996). Research Report, Nº PI81

  
  

  Abstract

  The concept of the so called “artificial or balancing diffusion” used to stabilize the numerical solution of advective diffusive transport and fluid flow problems is revised in this paper. It is shown that the standard forms of the balancing diffusion terms, usually chosen in a heuristic manner, can be naturally found by introducing higher order approximations in the derivation of the governing differential equations via standard conservation (or equilibrium) principles. This allows us to reinterprete many stabilization algorithms and concepts used in every day practice by numerical analysts and also provides an expression for computing the stabilization parameter.

  Abstract
  The concept of the so called “artificial or balancing diffusion” used to stabilize the numerical solution of advective diffusive transport and fluid flow [...]

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