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Friction Between Warp and Weft in Viscoelastic Behaviour of Pliable Fabric Composites

Flexible composite materials are composed of woven plies and matrix the thickness of which ranges between 2 and 4 millimetres. In the range of small strains the viscoelastic effective relaxation tensor of pliable composite can be predicted. The material is reinforced by polyester fabric in which warp and weft are different and corrugated; these yarns are composed of approximately 80 percent of fibres and are supposed to be elastic and anisotropic. The PVC matrix is isotropic and viscoelastic The 3 D modelling is accomplished with the presence of friction between yarns. The presence of micro-friction allows the comparison of the model with the experimental curve of creep. The parametrical modelling of nine components of the relaxation tensor as Prony's series ensures the manageability of the behaviour for such type of materials.