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Ostre, Benjamin (2014)
Languages: French
Types: Article
Subjects: Fibre de carbone, Impact, Mécanique de l’endommagement, MEF, 620.1, Carbon Fiber, Impact behavior, Damage mechanics, Finite element analysis
L’objectif de ce travail est d’effectuer une campagne d’essais expérimentaux d’impact et de compression après impact sur chant de stratifiés composites afin d’établir les scénarios d’endommagements. Un dispositif d'essai au poids tombant a été utilisé afin de réaliser les impacts sur chant sur stratifiés avec différents drapages. Des coupes microscopiques, des radiographies aux rayons X et des analyses ultrasonores ont ensuite été effectuées afin de visualiser et de déterminer le scénario d’endommagement. Des essais de compression après impact ont également été réalisés. Les résultats des tests expérimentaux sont comparés avec un modèle numérique composé d'éléments d’interface pour décrire les fissures matricielles et d’éléments volumiques. Enfin, la prédiction numérique de la tenue résiduelle après impact permettra de diminuer les masses, d’éviter des essais coûteux, et donc de raccourcir la durée de développement. Low velocity / low energy edge impact and quasi-static experiments have been carried out on carbon fiber reinforced plastic (CFRP) structures. A drop-weight testing machine was used to impact four different UD laminates at 10, 20 and 35 J impact energy levels. In parallel, a quasi-static study has been conducted in order to compare its results with the impact ones. The impact results show that the static and dynamic behaviors are different. An analytical approach, to understand the impact damage scenario, is provided in order to explain the difference between static and dynamic edge impacts, regardless the stacking or impact energy. This approach explains well the dynamic and static initial stiffness and a crushing plateau. The fiber properties control the initial impact stiffness, while in the quasi-static indentation case, the properties of the matrix control the initial indentation stiffness. The crushing plateau is also controlled by the matrix properties. The impact scenario could be simulated easily knowing the material properties, the stacking sequence and the impact energy. In addition, that is crucial to model the residual strength. And all these experimental results have been compared with a finite element analysis that consists of interface elements to describe the matrix cracks and volume elements in order to simulate the impact and compression after impact damage and to predict the residual strength after impact. The model is in good agreement with the experiment. That will avoid expensive tests, and thus shorten the development time.
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