The mechanical properties of fibre glass reinforced polymers

In recent years, the glass fibre reinforced polymers(GFRP) were used for different structural applications inEgypt. The mechanical properties of GFRP are perhaps of moreinterest from the point of view of structural applications.In this work, the effect of fibre volume fractions (Vr =10\ to 50\) and fibre orientations (9 = 0 0 to 90°) of GFRPcomposite (E-glass/SIROPOL 7440) on the tensile elasticconstants (E , G , v ) and strength (0’ ) have been examinedx .2 .2 xtheoretically and experimentally. The elastic constants weredetermined theoretically by two methods, mechanics ofmaterials approach and Halpin-Tsai equations. However,Tsai-Hill theory and maximum stress theory were used topredict the tensile strength (0’ ). Comparison was made betweenxthe theoretical and experimental results. Also the tension andbending tests were carried out on filled GFRP specimens(E-glass/SIROPOL 7440/sand) to show the effect of fillervolume fractions on the mechanical properties of filled GFRPcomposite. The hand lay-up technique was used to manufacturethe tested specimens.It was found that the fibre volume fractions in GFRPcomposite, should not exceed than 30\ to give optimum value ofthe tensile modulus of elasticity and strength. Also theeffect of fibre volume fraction on E and 0’ of GFRP composite)C xwere decreased when the fibre orientation increased. On theother hand, the sandy filler improved theelasticity of GFRP when the fibre volumethan 20\.bending modulus offractions are less