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| Abstract for Invited Lecture 1 |
| Multiscale analysis of the strain rate effect on the behaviour and damage of composite materials Didier Baptiste The evolution of the damage mechanisms occurring at the micro scale for a strain rate range between 10-4 and 350 s-1 is presented. The evolution of microcracks is compared to the decrease of the Young modulus on the specimen loaded on a high speed tensile machine (20 m/s). The quantitative data at the micro scale is used in a micro macro model (Mori and Tanaka) to predict the macroscopic behaviour of the composite. Experimental results at two scales and the homogenisation model are combined to lead to physical anisotropic viscodamage behaviour laws. Illustrations will be given on different composites: glass polyester laminate, carbon epoxy laminate and SMC.
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