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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