Material Model of Layered Fabric Composites with Delamination Prediction for Impact Simulations using Standard Reissner-Mindlin Shell Formulation
Résumé
In order to respond to design and security needs, a material model intended for impact simulations has been developed. It increases the predictability of impact simulations. Usually, the delamination prediction requires computationally expensive methods. The following method on the other hand includes the delamination at the material model level. It works as an add-on to an intralaminar model, which is able to describe the behavior of various fabric plies. The latter is based on the explicit formulation of the matrix damage model developed by the ONERA. Coupling with a Maxwell-Wiechert model, the viscoelasticity is included by coupling a generalized Maxwell model. Additionally, it is formulated under a total Lagrangian scheme in order to maintain consistency for finite strain. Thanks to the stacking sequence description and the membrane deformation provided by a Mindlin-Reissner shell formulation, the material model is able to compute the through-thickness strains. Based on a higher-order zigzag displacement theory with interfacial imperfections, the strains are established by using an internal loop, which ensures the internal energy equilibrium between both plate theories