Flow characteristics of epoxy resin systems for low pressure transfer molding.

Low Melt Viscosity Resins for Resin Transfer Molding

Modeling of Resin Transfer Molding

Resin Transfer Molding (RTM), as a method for the manufacture of advanced ber reinforced composite materials, is attractive because it ooers the possibility of lower manufacturing costs and more complex shapes than traditional methods. A major issue in this new manufacturing process is the elimination of void spaces in the resin ll operation, so that products with high quality are manufactured....

Low Pressure Resin Transfer Molding for Cost Effective Aircraft Quality Structures

Typically aerospace components produced using the Resin Transfer Molding (RTM) process are required by specification to use very high final injection pressure. This is believed to be necessary to produce a laminate that is void free and that produces structural equivalence to historical autoclave moldings. However, a low pressure RTM process has been developed, tested, and validated that produc...

Parameter Estimation for Resin Transfer Molding

A simplified approach for estimating weld lines, vent locations and fill times for resin transfer molding applications in non-planar geometry is presented. The molding parts are treated as polyhedral spaces for which the concept of Voronoi diagram and shortest paths is utilized to predict the formation of weld lines, location of vents and filling times. The approach is based purely on geometric...

Eliminating Volatile-Induced Surface Porosity During Resin Transfer Molding of a Benzoxazine/Epoxy Blend

We studied the mechanism of volatile-induced surface porosity formation during the resin transfer molding (RTM) of aerospace composites using a blended benzoxazine/epoxy resin, and identified reduction strategies based on material and processing parameters. The influence of viscosity and pressure on resin volatilization were determined. Then, in situ data was collected during molding using a la...