Détermination expérimentale et numérique de l'endommagement induit par un impact basse vitesse sur un stratifié CMO à préformes textiles dans un contexte industriel
Résumé
The use of Layered Fabric Reinforced Polymers (LFabRP) in the automotive industry is growing significantly. A new material model was developed for the LFabRP to improve the predictability of low-speed impact simulations by means of Finite Element Analysis (FEA). The delamination evaluation is included within the material model. It allows to describe the behaviour of a layered material by using only one shell element through-the-thickness and takes into account the delamination effects. By ensuring the internal energy equivalence between both element and material model theories, a realistic strain field for layered material is provided to the intralaminar material model. The intralaminar material model is based on a pre-existing continuum damage model (Onera Damage Model). To improve the efficiency and the precision for the modelling of LFabRP, friction mechanisms, a rheological viscoelastic model and a smeared crack approach for the fibre failure were introduced. The validation of the present model was carried out by means of controlled impact tests. The LFabRP taken as reference is made up with three different fabric preforms and the material parameters are exclusively determined on the preforms taken individually. 3D damage mapping with ultrasonic inspection is compared to simulation predictions.
Domaines
Matériaux
Origine : Fichiers produits par l'(les) auteur(s)
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