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Contribution à  la détermination des paramètres ultrasonores des gondolements des fibres dans un matériau composite à  matrice céramique renforcé des fibres du «rhectophyllum camerunense

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par Emmanuel Georges MBEI LISSOUCK
Université-Douala ( UFD Physiques et Sciences de l'Ingénieur) - DEA Mécanique-Matériaux 2008
  

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Abstract

Tests on fibrous plaster sheet, reinforced with sisal

and glass fibres in the bulk density range 56 to

72.5 lb/ft3

(W/P = 0.9 to 0.6), show that sisal

fibre decreases the strength of the gypsum

composite

by approximately 30 to 50% and glass fibre by approximately 0 to 30%. The effect on compressive stren

gth shown by the two fibres can be largely explained on the basis of differing volumes and stiffness. Variation of the fibre content in the plaster sheet increases the tensile strength with increasing fibre contents much as would be expected.

A theory based on a non-linear stress-

strain curve is proposed and the predictions of this theory are found to be in reasonable agreement with the test results. However, it is concluded that variations

sisal is used as the rei

in the ultimate flexural strength, where nforcing fibre, are of such

magnitude that it is impossible to predict flexural strengths with any degree of accuracy. Until the source of this variability can be found it is not possible to make any design improvements to the strength of the fibrous plast

er sheet. The outlook is more hopeful for the use of glass fibre as a reinforcing material but further work is required to confirm this.

MEMOIRE DE MASTER II RECHERCHE 53 2008-2009

CONTRIBUTION Á LA DÉTERMINATION DES PARAMÈTRES ULTRASONORES DES GONDOLEMENTS DES FIBRES DANS UN MATÉRIAU
COMPOSITE Á MATRICE CERAMIQUE RENFORCÉ DES FIBRES DU «RHECTOPHYLLUM
CAMERUNENSE».

[ANNEXE 3]

Figure.1. composite à fibres de carbone stratifié

MEMOIRE DE MASTER II RECHERCHE 54 2008-2009

CONTRIBUTION Á LA DÉTERMINATION DES PARAMÈTRES ULTRASONORES DES GONDOLEMENTS DES FIBRES DANS UN MATÉRIAU
COMPOSITE Á MATRICE CERAMIQUE RENFORCÉ DES FIBRES DU «RHECTOPHYLLUM
CAMERUNENSE».

Figure.2. Résumé des différents défauts des matériaux composites à fibres

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