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Different recovery procedures for the construction of smoothed stress in 3D

Abstract:

The combined application of two techniques improved for zone tension smoothing: Superconvergent Patch Recovery (SPR) and Recovery by Equilibrium Patches (REP), are analyzed. The techniques are improved on hexahedrons for three-dimensional domain problems which allow obtaining more exact results when using the finite elements method. To analyze the combination behavior of these techniques, an h-adaptive procedure is applied using the Zienkiewicz-Zhu estimator to determine the error that involves the smoothed stress field. The convergence results and efficiency index show that both techniques are analogous when the meshes have high degrees of freedom.