| Resin Transfer Molding (RTM) is one of advanced preparative technique of composite material. It is highly-regarded in field of composite material by scholar at home and abroad. The properties of part is decided by flow behavior of resins in RTM. So it is instructive and meaningful to research resin flow in the RTM process, the shape and pressure field for production practice.(1) The influence of gravity on the flow of resin is considered. Mathematical model of the flow of resin between the fiber bundles is established and the unsteady flow process is simulated. Pore forming mechanism is researched for the RTM process. The impact of fiber spacing, the molding temperature and filling velocity on the flow front are showed.(2) The reinforcing material is changed to porous medium. The space in fiber bundle and between the fiber yarns is considered pure fluid/porous medium coupling region. Based on the N-S equation, the surface tension, viscosity loss and inertial loss are considered in the momentum equation. The momentum equation is discreted by finite volume method and solved by PISO algorithm. Combined with VOF interface tracking method, numerical simulation of the flowing problems of fluid in reinforcing material is developed. Fluent software is selected for simulating the flow in fiber bundle and between the fiber yarns. The effect discipline of technological parameters on the flow front is received under constant flow speed.(3) The thickness of three-dimensional mathematical model for the impact on the flow front is accounted. The model of resin flow in cavity is established. The edge effect is studied. The simulation results are a good agreement with existing experimental results.The microscopic flow behavior of resin in RTM is studied in this article for lower cost, lower defect and high performance. It is meaning to select and optimize technological conditions. |
PDF Full Text Request