THE INFLUENCE OF THE CONDITIONED BONDS OF TWO TARGET MODELS
DOI :
https://doi.org/10.35219/mtd.2021.3.02Mots-clés :
simulation, finite element method, ballistic impact, unidirectional fabrics, interlaminar delaminationRésumé
This paper compares two models for ballistic impact on unidirectional fabrics in order to evaluate their influence in making the simulation closer to actual events.
The importance of including the effect of fibers and yarns architecture, their properties, and those for their matrix in the model is highlighted by figures showing equivalent stress distributions at different moments of the impact and photos from the run simulations. It resulted that the model with interlaminar delamination is more suitable for these simulations, considering the stress distribution analyzed for the main yarns of the panel. The absence of bonding generates high bending stress and the separation of layers on the entire panel. When the layers are bonded in the condition described in the model with CZM (cohesive zone model), high stresses are localized in the impact region and the dynamics of yarns’ failure are more rapidly, as revealed by the simulation.
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