TY - EJOU AU - Bussamra, F.L.S. AU - Neto, E.Lucena AU - Ponciano, W.M. TI - Simulation of Stress Concentration Problems by Hexahedral Hybrid-Trefftz Finite Element Models T2 - Computer Modeling in Engineering \& Sciences PY - 2014 VL - 99 IS - 3 SN - 1526-1506 AB - Hybrid-Trefftz stress finite elements have been applied with success to the analysis of linear and non-linear problems in structural mechanics. Two independent fields are approximated: stresses within the elements and displacements on their boundary. The stress field satisfies the Trefftz constraint a priori, i.e., it is extracted from the Navier equation solution. This type of element has provided remarkable improvement in stress predictions compared to the standard displacement-based finite elements. In this work, solution of stress concentration problems is carried out by hexahedral hybrid-Trefftz stress element models. Stress concentration factors and stress intensity factors are then identified and compared with available results. The hierarchicalp-refinement strategy is exploited in the numerical tests. KW - Hybrid element KW - Trefftz element KW - stress concentration KW - hexahedral element DO - 10.3970/cmes.2014.099.255