Molding And Numerical Simulation Of The Filling Stage Of Compression Resin Transfer Molding

Compressingresin transfer molding (CRTM)whichdeveloped formresin transfermolding (RTM) isan advanced composite liquid molding process.The fillingdirections of resin flow both in the thickness direction and in theplane. Comparedwith the molding RTM molding that can significantly reduce the filling time andincrease fiber content,improve the quality of products. The numerical simulation ofthe filling process can analyze the impact of each parameter, so the filling process isoptimized to reduce the times of trying.In this paper, it established one-dimensional CRTM model and two-dimensionalCRTM model.injection pressure, clamping force and others physical are derivedbythe one-dimensional moldinganalytical expressionbythe shape of products and itresearched the two-dimensional molding bynumerical methods,and madesimulationprograms. The main work is focused on such aspects as follows:1) According the Darcy law ofthe porous media flowing and the principle ofconservation quality of the incompressiblefluidestablishedthe isothermal filledprocessby one-dimensional condition equations and the boundary. The integration byparts derivedphysical quantities: the analytical expressions of pressure field, velocityfield,flowingfrontier, clamping force and filling time. Simulation results show thatthe filling time of CRTM can be significantly reduced compared with theconventional RTM.2) The theoretical model of the two-dimensional CRTM filling process wasestablished.The Gaussian integral principles derived the corresponding variationalequations, the finite element solution calculation the pressure field and the controlvolume method simulating the flow front, making the simulation program.Thesimulation results agree withthe experimental resultsof literatureswell.3) The isothermal conditions filling process of the cover plate simulatedbyPAM-RTM software.The filling time and the clamping force impact by the injectionsite, the positionof resin getting out and the compression speed and the otherprocessing parameters, optimizing the position of resin getting out and thecompression speed. The simulation results show that the filling time of RTM islonger than CRTM,if producing the same area products simulation resultsclose.This work can provide a basis theory and optimization methods for thecomposite products molding and mold designing and mold processing.