Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 43, Issue 8, Pages 1187-1196Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2012.03.016
Keywords
Anisotropy; Analytical modeling; Moisture absorption
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A new method to characterize three-dimensional, anisotropic moisture absorption in polymeric composites using experimental gravimetric absorption data is presented. This is achieved by using the three-dimensional hindered diffusion model to recover the moisture absorption properties of composites which may exhibit Fickian or non-Fickian behavior. Effectiveness of the recovery of absorption properties is assessed using artificially generated experimental data. Anisotropic diffusivities, equilibrium moisture content (M-infinity), and molecular binding (gamma) and unbinding (beta) probabilities that govern absorption dynamics are recovered by minimizing the difference between model predictions and experimental data. Using artificial moisture absorption data, diffusivities and M-infinity are recovered with less than 1% error, whereas gamma and beta are recovered with less than 3% error in the non-Fickian diffusion case. Equilibrium moisture content is shown to be accurately determined much earlier by using partial gravimetric data obtained from the initial phases of absorption, even in the presence of considerable measurement error. (C) 2012 Elsevier Ltd. All rights reserved.
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