Problématique de la mesure de perméabilité transverse de pré-formes fibreuses

National audienc

Modélisation et approche expérimentale des variations dimensionnelles de circuits imprimés.

International audienc

Contribution to composite T beam design in industrial environment by using the grid technique

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Introduction à la durabilité des matériaux composites renforcés par nappes unidirectionnelles cousues.

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Monitoring of Resin Infusion Process by Embedded Optical Fibres

International audienc

Étude par chromatographie gazeuse inverse (CGI) des propriétés acido-basiques des matériaux textiles en verre

Some of our studies were devoted to characterise acid-base properties of some solid substrates like oxides : MgO, ZnO, SiO2 and Al2O3, carbon fibres and polymers as PMMA at various tacticities adsorbed on silica and on alumina by using inverse gas chromatography(IGC) at infinite dilution, systems, that are known to interact strongly through acid-base interactions and ionic bonds. In this paper, we used IGC technique to characterise three textile materials (in glass fibres), noted respectively A, B and C. To do this, we used our model previously elaborated and giving the specific enthalpy of adsorption (-ΔHSP) of a polar molecule adsorbed on a solid : (-ΔHSP) = KA.DN + KD.AN -K.AN.DN, were DN and AN are the electron donor and acceptor numbers of the molecule and KA.and KD are the acidic and basic constants of the solid. The parameter K reflects the amphoteric character of the solid. Values of KA, KD and K were obtained from this model by using Mathematica program, and allowed to give the following conclusions : - Material A has an acidic character and it is more acidic than the two other materials. - Material B has an amphoteric character with a basic tendency. - Fibre C is the more basic material relatively to the others, the ratio between its basic constant to acidic constant being close to 3

Experimental determination of the permeability of textiles: a benchmark exercise

In this international permeability benchmark exercise, in-plane permeability data for two reinforcement fabrics, obtained using a total of 16 different experimental procedures, were compared. Although, for each procedure, the results appear consistent, different procedures result in a scatter of up to one order of magnitude in principal permeability values for each fabric at any given fibre volume fraction. The ratio of the principal permeability values varies by factors of up to 2. While experimental uncertainties and variability of the specimens affect the scatter in results for any single series of experiments, it is suspected that the main source of scatter in results from different procedures is related to human factors. Aiming at standardisation of measurement methods and interchangeability of results, "good practice" guidelines will be formulated in order to eliminate sources of scatter. (C) 2011 Elsevier Ltd. All rights reserved.status: publishe

Experimental determination of the permeability of textiles: A benchmark exercise

In this international permeability benchmark exercise, in-plane permeability data for two reinforcement fabrics, obtained using a total of 16 different experimental procedures, were compared. Although, for each procedure, the results appear consistent, different procedures result in a scatter of up to one order of magnitude in principal permeability values for each fabric at any given fibre volume fraction. The ratio of the principal permeability values varies by factors of up to 2. While experimental uncertainties and variability of the specimens affect the scatter in results for any single series of experiments, it is suspected that the main source of scatter in results from different procedures is related to human factors. Aiming at standardisation of measurement methods and interchangeability of results, "good practice" guidelines will be formulated in order to eliminate sources of scatter. (C) 2011 Elsevier Ltd. All rights reserved