@Article{cmes.2014.099.255,
AUTHOR = {F.L.S. Bussamra, E.Lucena Neto, W.M. Ponciano},
TITLE = {Simulation of Stress Concentration Problems by Hexahedral Hybrid-Trefftz Finite Element Models},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {99},
YEAR = {2014},
NUMBER = {3},
PAGES = {255--272},
URL = {http://www.techscience.com/CMES/v99n3/27179},
ISSN = {1526-1506},
ABSTRACT = {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.},
DOI = {10.3970/cmes.2014.099.255}
}