Identification of diffusion properties of composites materials for aircraft applications

The paper deals with the identification of planar anisotropic diffusion properties carbon-epoxy composite materials for aircraft applications, based on exploitation short-time gravimetric tests. method consists in performing short time tests composites samples and measuring initial slope their mass uptake curve respect to t. is performed by minimizing sum squared residuals, residual being difference between measured analytical slope. protocol allows determining 2 coefficients along principal directions orthotropy orientation orthotropic frame reference sample frame. Analysis discussion results allow propose a robust protocol.