Finite element stabilization matrices-a unification approach

Kam Liu Wing Kam Liu*, Shau-Jen Ong Jame Shau-Jen Ong, Rasim Aziz Uras

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

159 Scopus citations

Abstract

In this paper, we show that the stabilization vector γ can be obtained naturally by taking the partial derivatives with respect to the natural coordinates. Hence, the components of the strains and stresses can be expressed in terms of a set of orthogonal coordinates. With these definitions of stresses and strains, a general form of the finite element stabilization matrices is then constructed for underintegrated, irregular shape and anisotropic elements. The explicit expressions of the stabilization matrices for the 4-, 9- and 8-node Laplace and continuum elements and the 4-node plate element are then derived from the general form. These are sufficiently general for the developments herein. The generalization of the stabilization-matrices concept to nonlinear problems which usually require the numerical integration of a fairly general class of nonlinear, finite-deformation constitutive equations is also presented. The computer implementation aspects and numerical evaluation of these stabilized elements are also considered. Numerical tests confirm the stability and accuracy characteristics of the resulting elements. In particular, the numerical experiments reported here also show that the rates of convergence in the L2-norm and in the energy norm agree well with the expected convergence rates.

Original languageEnglish (US)
Pages (from-to)13-46
Number of pages34
JournalComputer Methods in Applied Mechanics and Engineering
Volume53
Issue number1
DOIs
StatePublished - Oct 1985

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Computer Science Applications

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