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Simulation numérique de la propagation de fissure en fatigue par la méthode des éléments finis étendus : prise en compte de la plasticité et du contact-frottement

Thomas Elguedj 1, 2 
Abstract : Linear elastic fracture mechanics is not able to model one of the physical phenomenon of fatigue crack growth: the plasticity induced crack closure effect first observed by Elber. Crack propagation simulation is a difficult numerical issue in which remeshing and field projection is almost unavoidable. New numerical methods, that model implicitely discontinuities, such as the extended finite element method appeared recently. One proposes to use it to model crack closure. It is therefore necessary to take into account plasticity around the tip and contact on the crack lips. A new plastic enrichment basis is coupled with an augmented Lagrangian formulation in the framework of the XFEM. Comparisons between numerical results and results from experimental tests obtained with digital image correlation show the ability of the method.
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Submitted on : Wednesday, November 30, 2011 - 6:02:47 PM
Last modification on : Tuesday, October 5, 2021 - 9:30:03 AM
Long-term archiving on: : Thursday, March 1, 2012 - 2:35:42 AM

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  • HAL Id : tel-00646832, version 1

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Thomas Elguedj. Simulation numérique de la propagation de fissure en fatigue par la méthode des éléments finis étendus : prise en compte de la plasticité et du contact-frottement. Mécanique des solides [physics.class-ph]. INSA de Lyon, 2006. Français. ⟨tel-00646832⟩

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