During the preforming phase, the dry reinforcement may be subjected to several deformations: tension, shear, but also compression. If two first déformations have been well explored in several studies in recent years, this is not the case of compression. However, this type of deformation significantly affects the permeability of the reinforcement during resin injection because it changes the porosity of the reinforcement both in form and in terms of size. This thesis proposes to study the behavior of the reinforcement in compression and the influence of this deformation on the permeability. For this purpose, compression tests are conducted to study the impact of compaction on the overall deformation of the reinforcement and the various factors that may affect it. Parallel to the experimental study, finite element based numerical simulations at the mesoscopic scale was implemented. The simulations are validated by the mechanical tests. The deformed geometry obtained by the mechanical simulations was then processed by a meshing chain to obtain a 3D regular mesh of the RVE fluid. The prediction of the permeability of the woven reinforcement is achieved by solving the Stokes and Brinkman equations and by using the homogenization on the grid mentioned above.
