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Recherche - Valorisation

Transfer to industries of advanced approaches to predict the strength and fatigue lifetime of aeronautical composite structures.

le 24 mai 2018
à 13h30

Frédéric Laurin, Ingénieur de Recherche à l'ONERA, interviendra lors d'un séminaire.

New generations of 3D woven composite materials have been recently developed to be used in aeronautics as an alternative to the classical laminated composite materials, for structures exposed to impact. Therefore, it has been necessary to determine precisely the damage and failure scenarios for such materials subjected to different kinds of loading (static loading, impact and fatigue) through a large experimental multi-instrumented tests campaign performed at Onera. Based on these observations, a damage and failure approach has been developed specifically for this kind of materials, taking into account the different observed sources of non-linearity. The strength predictions obtained with this model have been validated through comparisons with available tests on unnotched specimens, open-hole plates and notched specimens subjected to static loadings. Moreover, low velocity impact on unnotched specimens have been performed to study precisely the diffuse damage mechanisms encountered in such materials and simulated successfully with the present model (especially concerning the size of the damaged area, the residual dent depth and the dissipated energy, which are key parameters often used in industries). Then, the residual performances of the material subjected previously to impact have been estimated experimentally and numerically and major differences with classical laminated solutions have been observed. Finally, the model has been extended to estimate the fatigue lifetime of woven composite materials subjected to cyclic loadings. The first comparisons with available experimental results (evolution of the apparent modulus and fatigue lifetime) are very promising. Therefore, the present damage and failure approach can be used by engineers in aeronautics to design accurately woven composite components subjected to a wide range of industrial loading cases.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Bâtiment Léonard de Vinci
Amphi E-media

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