Propriedades mecânicas de compósitos poliéster/tecidos de juta (tricotado e tramado).

Abstract

In this work , the mechanical properties of the composites(polyester resin /jute, knitted and warped) were analysed in function of the architecture of the fabric ,as well as the effect of the pos-cure treatment under the knitted cloths. For obtaining the consistent values for all the elastic modules, it was applied the mathematical methodology developed by Gommers. The results have showed that the composites with knitted fabric have presented tensile strength and levels of deformation lower than the polyester resin while elastic modulus were superior to the matrix in all the analysed cases. The best properties were observed with a content of 40% (weight) fibre. The composites reinforced whith the weave fabric, have showed lower tensile strength in relation to the matrix in which the content of fibre was 26% ( two layers of fabric) while those ones reinforced by 4 layers (38%,weight ) have showed a higher tensile strength. In all cases the elastic modulus was superior to the matrix and the deformation was lower. In general, the composites reinforced with warped cloths have demonstrated superior properties in relation to the composites reinforced with knitted cloths. Although the latter ones showing more resistance to impact . Concerning the mathematical methodology, the results obtained were quite consistent, coinciding the experimental values with the theoretical ones. The following results for elastic modulus were: Exx between 0,894 and 0,693 GPa; Eyy between 0,717 and 0,389 GPa; Exy between 3,314 and 2,564 GPa; and the shear module, G between 0,539 and 0,352 GPa.