Comportement dynamique d'un composite· 3D C/C : meso-modelisation et prevision de Ia rupture sons choc
Keywords:
3D Carbon/Carbon composites, meso-modelling, damage, hanging scale method, shock, computationAbstract
A method for the fra cture prediction under dynamic loading of small structures made of a 3D Carbon/Carbon composite is proposed. Due to the length scale of the loading, the notion of homogenised material is meaningless ; our choice is to model, identify and compute the material at an intermediate or meso scale (fiber strands - matrix blocks). Our idea is that, due to the smallness of the meso scale, the previous description of the damage mechanisms should be valid even for high-rate loading. The meso-modelling is based on the static and dynamic tests. Changing scale methods are applied to identify the mesoscopic model parameters (dommage-plasticity-porous) from static tests. The results of dynamic computing of plate/plate tests confirm the method.
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