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Theses

Sur la gestion des bandes de localisations dans les composites stratifiés avec un modèle d'endommagement à taux limité

Abstract : The use of localization limiters is needed to take into account the apparition of macro-cracks during the simulation of the evolution of degradations in laminated composite materials with respect to experiments. Those introduce a parameter which can be related to a characteristic length, or a characteristic time, and therefore be identified. The approach introduced at LMT-Cachan is, in dynamics, to use a delayed damage model. It's based on the fact that a crack can't appear instantaneously. This model gives excellent results in dynamics and has the advantage to be local in space. Unfortunately, it requires a time discretization related to the characteristic time introduced (of the order of a microsecond for composites), which is far too computationally expensive for quasi-static simulations. Simulations in these loading cases need the use of a different characteristic time from the one identified which can't maintain anymore a result in accordance to experiments. We then adapt the parameters of the damage evolution law to obtain a propagation of a macro-crack in the localized zone that is energetically compatible with fracture mechanics by controlling the strain energy release rate. This work is dedicated to maintain the objectivity of the solution and to adapt the dissipated energy to fracture mechanics to be able to use a characteristic time exploitable for the simulation of composite samples under quasi-static loading.
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Submitted on : Wednesday, December 18, 2013 - 11:08:12 AM
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Camille Le Mauff. Sur la gestion des bandes de localisations dans les composites stratifiés avec un modèle d'endommagement à taux limité. Autre. École normale supérieure de Cachan - ENS Cachan, 2013. Français. ⟨NNT : 2012DENS0005⟩. ⟨tel-00920317⟩

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