A novel procedure for identification of 3D moisture diffusion parameters on thick composites : theory, validation and experimental results
| Autor: | Fabrice Pierron, Y. Poirette, Alain Vautrin |
|---|---|
| Přispěvatelé: | Laboratoire de Mécanique et Procédés de Fabrication (LMPF), Centre Science des Matériaux et des Structures (SMS-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département Mécanique et Procédés d'Elaboration (MPE-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS, Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Optimization problem
Materials science Mechanical Engineering System identification 02 engineering and technology 021001 nanoscience & nanotechnology Fick's laws of diffusion 020303 mechanical engineering & transports Data point Exact solutions in general relativity 0203 mechanical engineering Mechanics of Materials Materials Chemistry Ceramics and Composites Gravimetric analysis Diffusion (business) Composite material 0210 nano-technology Saturation (chemistry) ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Composite Materials Journal of Composite Materials, SAGE Publications, 2002, 36 (19), pp.2219-2244 |
| ISSN: | 0021-9983 |
| Popis: | This paper presents a novel method for the identification of the parameters governing Fickian moisture diffusion in composite materials. In the first part of the manuscript, the theoretical background is given and closed-form solutions are produced for 3D Fickian diffusion. Then, the different existing identification alternatives are reviewed and a novel procedure is proposed that takes advantage of all the gravimetric curve data points instead of just initial slope and saturation. The method relies on the solution of an optimization problem. In the second part of the paper, validation of this identification technique is performed from simulated gravimetric curves. The main advantage of the method when compared to previously published materials is that diffusion coefficients and saturation level can be identified from gravimetric curves obtained from unsaturated coupons. This is particularly useful when considering thick coupons that will take a long time to saturate or when non-Fickian diffusion mechanisms occur after some time. Finally, the method is applied to experimental results obtained from glass/epoxy composites. It is shown that although the diffusion of moisture in the composite is basically non-Fickian, it can be considered Fickian up to about 10 days and that these data are sufficient to retrieve the 3D diffusion coefficients as well as the Fickian saturation level. |
| Databáze: | OpenAIRE |
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