Abstract: In order to solve the problem of preparation and setting of preform in RTM process, the dry fiber-liquid forming process was first studied domestically in this article. The main content was the influence mechanism of process parameters and the mechanical properties of liquid-forming process. Method of single factor was used to determine the influence of binder content, injection temperature and filling time on liquid forming. Then, the combination of optimum process was determined by orthogonal method. Finally, the inter-laminar shear and bending properties were compared with molding process. The experimental results show the flow filling of resin will be affected by the process parameter. The influence of injection temperature is the greatest, and the filling time has little effect. The correct combination of process can reduce defects such as pores to ensure the internal quality of composite. The mechanical tests show that the mechanical properties of the dry fiber-liquid forming process were equal to molding process, and the bending strength is slightly reduced.

Key words: preform, VARTM process-parameters, resin flow, porosity, mechanical properties