MESO-MACRO APPROACH FOR THE SIMULATION OF TEXTILE COMPOSITES FORMING

摘要

A lot of composites are made with woven reinforcements. Contrary to unidirectional reinforcements, these fibre fabrics permit to manufacture double curved parts accounting for the cohesion given by the weaving. The forming of theses composites makes use of the relative motion of the fibres that are possible in the case of matrix cohesion lack. A simulation code permits to know the feasibility of a fabric forming without using trial and error method that is very expensive. It also gives information on the fibre directions after forming. These directions determine the final composite structure mechanical properties. In addition, the angles between warp and weft yarns influence the reinforcement permeability and consequently the mould filling. In the presented meso-macroscopic approach the tensile and shear mechanical behaviour of the elementary cell (mesoscopic level) are used in finite elements made of woven meshes.