EQUIVALENT ELASTIC PROPERTIES OF THE COMPOSITE MATERIALS IN MACROMECANICS MODELING

Abstract

In macro-mechanics of the composite materials, the symmetric special orthotropic laminated composite material plate can be equivalent to a fictitious orthotropic plate from mechanical behavior point of view. The paper presents the computing analytical method which gives the mathematical expressions of the equivalent properties that characterize the fictitious orthotropic plate. Two kinds of laminated composite materials are subjected to tensile test: a composite material whose layers are reinforced with flax fabric; a hybrid composite material whose core layers are reinforced with flax fabric while top and bottom shell layers are reinforced with glass fabric. It is shown the mechanical properties obtained in tensile test, corresponding to the both weft and warp directions of the reinforcing fabrics. The experimental results obtained for the equivalent moduli of elasticity are compared with the theoretical values obtained by using the analytical model. The errors were less than 2% showing a good accuracy of the experimental results.