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Guillon, Damien (2008)
Languages: French
Types: Article
Subjects: Crush test, Energy absorption, Mécanique des matériaux, Absorption d’énergie, CFRP laminates composite, Corrélation essai/calcul, 620.1, Composites stratifiés, Crashworthiness, Numerical simulation, Crash
La maîtrise du comportement en cas de crash des structures en matériaux composites est une des difficultés qui accompagnent le développement industriel de ces structures. Le composite peut absorber de grandes quantités d'énergie si la structure s'écrase progressivement. Cette thèse vise à améliorer la compréhension des mécanismes de ruine mis en jeu dans ces fronts d’écrasements progressifs. Un montage expérimental innovant a été conçu. Il permet l'écrasement homogène, visualisé en direct, de plaques stratifiées. Une campagne expérimentale a permis d'obtenir une variété intéressante de mode de ruine. L'initiation, la stabilisation et les mécanismes d'absorption d'énergie dans les fronts d'écrasement sont analysés. Les relations entre chaque mode de ruine et l'influence des paramètres matériaux et expérimentaux sont expliquées. Une classification synthétique des modes de ruine est exposée. La modélisation numérique d'un front à l'échelle mésoscopique est proposée. Certains modes de ruine sont reproduits avec précision. Les mécanismes de ruine sont clairement identifiables et la contribution de chacun à l'absorption d'énergie est quantifiée. A key challenge for the industrial development of composite structures is to enhance its crashworthiness. Composites materials are known to absorb energy if they are crushed progressively. The aim of this thesis is to improve threw experimental and numerical study the understanding of the progressive crush mechanisms. An innovative crash test fixture has been designed in order to obtain real–time visualized homogeneous crush front on laminated plane specimens. An interesting variety of crush modes have been obtained by the experiments. Initiation, stability and energy absorption of the crush mechanisms are analysed. Connection between crush mode and influence of the material properties and experimental parameters are explained. A global classification of the crush mode is proposed. A finite element model of the crush front at mesoscopic scale is also developed. Some crush modes are simulated precisely. Crush mechanisms and their energy absorption contributions are clearly established.
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