Abstract: Six kinds of commonly injection molding scheme for a typical structure composite shell parts with VARTM process was simulated by the software of the RTM-Worx at first in this paper. The best suitable linear injection scheme was determined by the simulation results. Then, by means of optimizing the linear injection runner length and the location of double linear injection, we can get the best optimization injection method and compare it with the actual VARTM filling process. The results show that the simulation by RTM-Worx has a good agreement with the experimental result. It shows that the establishment of the model is quite reasonable and reliable. We can also get the following conclusions: although lengthening injection runner can reduce the filling time by increasing instantaneous resin flow volume, too long runner can cause the resin which flow to the edge back flow to center. It can easily form bubbles and dry spot defects which affect the quality of the product. We can choose multiple linear injection for a larger width product and when using n-multiple linear injection, the injection runner is suggested to set up along the length direction of product and be located in its width direction i2n( i=1,3,5,…,2n-1). It has an important guiding significance for choosing a reasonable injection scheme in the actual production.

Key words: typical structure shell parts, composite, VARTM, optimization of injection scheme, RTM-Worx, flow simulation