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Akpobi J. A. - One of the best experts on this subject based on the ideXlab platform.

  • A Finite Element analysis of axisymmetric flow of air through the top riser of casting using the stream function model
    Faculty of Engineering University of Nigeria Nsukka, 2018
    Co-Authors: Inegbedion F., Akpobi J. A.
    Abstract:

    Casting is a manufacturing process for making complex shapes of metal materials. Casting has two stages – filling process requiring a gating system and solidification process requiring a riser. The air in the mould cavity during casting is displaced through the riser by the molten metal in a very rapid manner necessitating the need to understand the air flow behaviour as it exit through the riser. The Finite Element method and the stream function model were used to analyze the axisymmetric flow of air through the top risers of casting. Results show that the velocity profile at any cross section is parabolic in shape with the maximum velocity at the centre. Comparing Results with exact solution shows that the Finite Element Result converged towards the exact solution.Keywords: stream function, axisymmetric flow, top riser, air, castin

Paulo A.f. Martins - One of the best experts on this subject based on the ideXlab platform.

  • Animation of Finite Element models of metal forming processes
    Computers & Structures, 1996
    Co-Authors: S. B. Petersen, R. Balendra, Jorge M.c. Rodrigues, Paulo A.f. Martins
    Abstract:

    Abstract An interface program which makes it possible to animate Finite Element models of metal forming processes in an “Autodesk 3D Studio” environment is presented. The program converts typical Finite Element Results files for a succession of deformation stages into an ASCII file suitable for loading into “3D Studio”. The interface presented processes two-dimensional models only; it requires that the models are discretized by linear rectangular Elements and dies by linear two-noded Elements. Conversion of mesh objects is based on the creation of triangular three-dimensional faces structured on a set of vertices which are defined by the node positions in the Finite Element Result file. The program is written in FORTRAN and a glossary of terms and the source listing are included. For axisymmetric cases, guidelines are provided for generating three-dimensional effects. An elaborate example of the operational procedure is given.

J A Akpobi - One of the best experts on this subject based on the ideXlab platform.

  • a Finite Element analysis of axisymmetric flow of air through the top riser of casting using the stream function model
    Nigerian Journal of Technology, 2018
    Co-Authors: F Inegbedion, J A Akpobi
    Abstract:

    Casting is a manufacturing process for making complex shapes of metal materials. Casting has two stages – filling process requiring a gating system and solidification process requiring a riser. The air in the mould cavity during casting is displaced through the riser by the molten metal in a very rapid manner necessitating the need to understand the air flow behaviour as it exit through the riser. The Finite Element method and the stream function model were used to analyze the axisymmetric flow of air through the top risers of casting. Results show that the velocity profile at any cross section is parabolic in shape with the maximum velocity at the centre. Comparing Results with exact solution shows that the Finite Element Result converged towards the exact solution. \ http://dx.doi.org/10.4314/njt.v37i3.20

Inegbedion F. - One of the best experts on this subject based on the ideXlab platform.

  • A Finite Element analysis of axisymmetric flow of air through the top riser of casting using the stream function model
    Faculty of Engineering University of Nigeria Nsukka, 2018
    Co-Authors: Inegbedion F., Akpobi J. A.
    Abstract:

    Casting is a manufacturing process for making complex shapes of metal materials. Casting has two stages – filling process requiring a gating system and solidification process requiring a riser. The air in the mould cavity during casting is displaced through the riser by the molten metal in a very rapid manner necessitating the need to understand the air flow behaviour as it exit through the riser. The Finite Element method and the stream function model were used to analyze the axisymmetric flow of air through the top risers of casting. Results show that the velocity profile at any cross section is parabolic in shape with the maximum velocity at the centre. Comparing Results with exact solution shows that the Finite Element Result converged towards the exact solution.Keywords: stream function, axisymmetric flow, top riser, air, castin

K. Hadjeb - One of the best experts on this subject based on the ideXlab platform.

  • ERROR ESTIMATION THROUGH THE CONSTITUTIVE RELATION FOR REISSNER-MINDLIN PLATE BENDING Finite ElementS
    Computers & Structures, 1999
    Co-Authors: Philippe Boisse, Sean Perrin, Gérard Coffignal, K. Hadjeb
    Abstract:

    Abstract This paper deals with the so-called ‘error estimation through the constitutive relation’ for Reissner–Mindlin plate bending Finite Element analysis, which is based on the calculation of statically admissible stress Resultant fields. Further an energy norm through the constitutive relation is introduced to quantify the difference between the calculated statically admissible stress Resultant fields and the stress Resultants given by the Finite Element analysis. The statically admissible stress Resultant fields are obtained by local calculations at the node or at the Element level. The procedures involve an optimization for estimating the statically admissible quantities as close as possible to the Finite Element Result, and thus lead to a more accurate error estimation, considering the Pragger–Synge theorem. The set of examples shows the good agreement between the proposed indicator and the error obtained from the analytical solution. It is concluded that plate bending analysis is a field of application which is well fitted for error estimation through the constitutive relation.