It is important to reveal distribution of properties within VARTM products in order to achieve accurate production. In this study, fiber volume fraction and mechanical property of VARTM products were evaluated. Consequently, fiber volume fraction and bending strength showed lower value near resin inlet region, and apparent distribution of such properties were shown. To modify distribution of properties within VARTM products, the effects of permeability and resin viscosity were evaluated. Permeability was changed by rotating of fabric alignment, and fiber volume fraction was increased. However resin viscosity was reduced by adding styrene monomer to vinylester resin, and fiber volume fraction was modified, mechanical properties were reduced.
