Prof. Christophe Bouvet
DAMAGE MODELLING OF COMPOSITE STRUCTURES WITH THE DISCRETE PLY MODEL APPROACH: FROM IMPACT TO CRUSHING VIA OPEN HOLE TENSILE TEST
Composite materials are more and more used in the field of transport, such as aeronautics, automotive or railway, in order to reduce the mass of structures. But composite structures are relatively brittle, in particular when subjected to impact, crash or holed. Moreover the damage developing in the laminate is particularly complex; it is composed of a complex mixture of three main damage types, i.e. matrix cracking, delamination and fibre failure. Then in order to numerically design this type of structure it is necessary to correctly simulate these different damage types, and in particular their interaction. For example it is well establish that the complex morphology of the damage developing during an impact test is intimately linked to the interaction between matrix cracking and delamination, with some effect of the fibre failure. In order to take into account the interaction between the intra and the interlaminar damage, i.e. between matrix cracks and delamination, the Discrete Ply Model (DPM) has been developed about more than 10 years ago in the ICA, Toulouse, France. The basic idea of the DPM is to account for the discontinuity of the matrix cracks using interface elements, and that this discontinuity can allow to simulate this interaction.