IDENTIFICATION OF PREFORM COMPRESSIBILITY BY INVERSE METHOD

International audience; The identification of the transverse properties of fabrics is becoming an important topic, as the transverse flow is significant in advanced liquid composite molding processes such as resin film infusion, vacuum assisted resin transfer molding process and compression resin transfer molding process. However, it is not easy to characterize the transverse permeability and the compressibility of preform, since the fluid flow and the mechanical response of fabrics simultaneously occur in the transverse direction. Due to the strong hydro-mechanical coupling, hence, it has been a common approach to identify the transverse properties either under the simplified assumption (uniform resin pressure in the transverse direction) or under the ideal case where the closed form solution is known. In the previous works, we developed a numerical code to simulate the resin film infusion process and an experimental device to for the measurement of transverse compressibility and permeability considering different compression conditions; either imposed force or imposed speed of compression. In this work, we characterize the material behaviors in the transverse direction by incorporating the material model into the full numerical simulation of an actual filling process. To identify the model coefficients, inverse method is applied with experimental measurements.