Caractérisation et modélisation de l'endommagement des composites bobinés. Application à la prédiction de l'éclatement des réservoirs bobinés hyperbares

Abstract : A damage model dedicated to wound composite is developed by using the tools of continuousdamage mechanics, irreversible processes thermodynamics and the representation theory of tensorfunctions. The particularity of this model is the use of a fixed directions approach of damage whichassociates each degradation mode to internal scalar variables and directional tensors. Fiber breakage(considered probabilistic), matrix cracking (transverse, out-of-plane or caused by shear) are thustaken into account. The model is able to reproduce, in a three-dimensional context imposed bythick composite layers, loss of strength, interaction between initial and induced anisotropy, nonlinearitybehavior, residual strain and shear viscosity. To validate this approach, thermo mechanicalbehavior of specimens from the wound structures was characterized by tensile multi - instrumentedtests (video - traction, acoustic emission, ...). We show that the model is able to simulate not onlythe macroscopic mechanical response of these samples, but also to reproduce the recorded acousticemission to distinguish the various forms of damage and to accurately predict the burst ofhyperbaric tanks.
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Juan Pedro Berro Ramírez. Caractérisation et modélisation de l'endommagement des composites bobinés. Application à la prédiction de l'éclatement des réservoirs bobinés hyperbares. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. Français. ⟨NNT : 2013ESMA0026⟩. ⟨tel-00954470⟩

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