Study of the effect of the thickness on the adhesion strength of mixture of resin-hydrophilic fumed silica used in manufacturing of composite high speed boats and comparing with small thickness using empirical study

This article examine the effect of thickness on the strength of adhesion of the mixture of resin-hydrophilic fumed silica using test. Now, composite structures because of many benefits, are used frequently in the various industries like marine industries. Maine component for manufacturing of composite structures are resin, reinforcement, adhesive, fillers, core, etc. In some composite industries use the mixture of resin hydrophilic fumed silica as a filler for reduction of resin viscosity and using in the slope region or vertical region or region with large gap. Notice that the mixture of resin-hydrophilic fumed silica or either fillers cannot be used in any thickness or loading conditions. In this article the mixture of resin-hydrophilic fumed silica referred by the name of Aerosil. In this article, three adhesive joint specimens with different are tested according to ASTM D5268 standard. In the experiments, adhesion and joint strength are examined. The Aerosil used in the manufacturing of test specimens, is the mixture of polyester resin B 130 of Kahar Company in Bushehr and hydrophilic fumed silica. Test results indicated that the adhesion of Aerosil in the thickness of 6, 13 millimeter are completely different from adhesion of Aerosil with the thickness less than 1 millimeter and also with the increase of Aerosil thickness, shear strength and toughness, reduce extremely.