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FEM Techniques Comparison for SIF Computing of Cracked Plate

Auteurs : Elkahina Sari, M. Zergoug
Année : 2015
Domaine : Sciences des matériaux
Type : Publication
Revue : Arabian Journal for Science and Engineering
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : stress intensity, energy release rate G

Résumé :

The main purpose of this paper is to perform a computation comparison of stress intensity factor ‘SIF’ evaluation in case of cracked thin plate with aluminum alloy 7075-T6 and 2024-T3 used in aeronautics structure under uniaxial loading. This evaluation is based on finite element method with a virtual power principle through two techniques: the extrapolation and G−θ . The first one consists to extrapolate the nodal displacements near the cracked tip using a refined triangular mesh with T3 and T6 special elements, while the second, consists to determine the energy release rate G through G−θ method by potential energy derivation which corresponds numricaly to elastic solution post-processing of a cracked solid by a contour integration computation via Gauss points. The SIF obtained results from extrapolation and G−θ methods will be compared to analytical solution in particular case. To illustrate the influence of the meshing kind and the size of integration contour position, simulations are presented and analyzed.