On A Mixed Finite Element Formulation For Plane Elasticity.

Abstract

In this work we present some numerical results for a mixed finite element
formulation for elasticity problems. In particular we have tested a triangular finite element
with linear interpolation for both displacements and strains. We use the displacements at
vertices and a combination of stresses and strains at mid-side points as nodal variables. A
static condensation technique was employed that rendered a finite element formulation with
only nodal displacements as degrees of freedom. Some comparisons are made with other
conventional elements that show the high performance of the mixed element.