Print Email Facebook Twitter Combined experimental/numerical investigation of directional moisture diffusion in glass/epoxy composites Title Combined experimental/numerical investigation of directional moisture diffusion in glass/epoxy composites Author Rocha, I.B.C.M. Raijmaekers, S. van der Meer, F.P. Nijssen, R.P.L. Fischer, H.R. Sluys, L.J. Publication year 2017 Abstract A combined experimental and numerical investigation is conducted on the anisotropic water diffusion behaviour of unidirectional glass/epoxy composites. Experimental diffusivity values are obtained by immersing thin material slices for each of its planes of orthotropy extracted from a thick composite panel and interphase measurements are performed using thermal analysis. In order to elucidate the observed anisotropy, the diffusion process is modelled at the microscale using a representative volume element (RVE) of the material with random fibre distribution. Water concentration gradients are applied to the micromodel and a homogenisation procedure is used to retrieve the macroscopic diffusivity coefficients. The influence of the interphase around the fibres on the diffusion process is modelled by making the matrix diffusivity a function of the distance to the nearest fibre using a level set field. The models are used to fit the experimental data and test a number of hypotheses that may explain the observed anisotropy. The effect of fibres acting as barriers for water movement is found to partially explain the observed transverse diffusivity. However, a fit is only obtained by allowing faster diffusivity at the interphase. In the longitudinal direction, a fit can only be found by allowing for orthotropic interphase diffusivity. Subject Nano TechnologyMAS - Materials SolutionsTS - Technical SciencesMaterialsIndustrial InnovationAnisotropyFibre/matrix interphaseHomogenisationWater diffusion To reference this document use: http://resolver.tudelft.nl/uuid:6362eea1-f13c-4b46-9ca4-f853e1797578 DOI https://doi.org/10.1016/j.compscitech.2017.08.002 TNO identifier 781372 ISSN 0266-3538 Source Composites Science and Technology, 151, 16-24 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.