Analyse des fissures elliptiques en statique et en fatigue par hybridation de fonctions de Green

Abstract : A method improving the evaluation of the stress intensity factor by hybridization of two weight functions is presented and applied for embedded elliptical cracks under various loadings. The hybridization consists in using one or another function in the zone of the crack where it is the most efficient. The delimitation of the zones is achieved after optimizing the geometrical parameters of the crack. In order to extend the use of this approach to the modeling of semi-elliptical surface cracks, its coupling with the PWFM (Point Weight Function Method) to take account of the free edge effect were carried out. The use of the fatigue crack growth laws (Paris law and Sih law) allowed the extension of the application of the hybrid approach to the fatigue problems. The quality of the results found for the elliptical and the semi-elliptical cracks is good for the static loads as well as for the fatigue ones
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Brahim El Khalil Hachi. Analyse des fissures elliptiques en statique et en fatigue par hybridation de fonctions de Green. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL034N⟩. ⟨tel-01752894⟩

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