A pure-pseudostress mixed FEM for the elasticity eigenproblem is locking-free, needs no symmetry constraint, and comes with a priori and residual a-posteriori error estimates that remain valid as Poisson ratio approaches 1/2.
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A locking free mixed FEM based on a pure pseudostress based formulation for the elasticity eigenproblem
A pure-pseudostress mixed FEM for the elasticity eigenproblem is locking-free, needs no symmetry constraint, and comes with a priori and residual a-posteriori error estimates that remain valid as Poisson ratio approaches 1/2.