In-plane and through-thickness permeability models for three-dimensional Interlock fabrics

Abstract

An analytical model has been created to estimate the in-plane and through-thickness permeability of three-dimensional Interlock fabrics. The model is based on the calculation of the pressure drop in the mesoscopic pores, i.e. in the inter-tow spaces of the fabric. Firstly, the dimensions and distribution of the mesopores are determined from the weaving parameters. A mesoscopic permeability model can then be inferred from the fabric structural data. The contribution of the microscopic flow inside the tows is also taken into account by introducing the concept of dual scale porosity. This additional feature is shown to improve the permeability model, which is validated by comparison with the experimental values of principal permeability measured for five different three-dimensional Interlock fabrics.