Simplifed Mold Filling Simulation in Resin Transfer Molding

1
Simplifed Mold Filling Simulation in Resin
Transfer Molding
Prepared by Dae Jung Kim, Supervised by Dr.
Alfred Loos and Goker Tuncol
7. Results and Conclusion
4. Motive
1. What is RTM?
The results are compared with a simulation
program using Finite Element (FE) solution.
Results agree well.
In this study, the two process parameters of a
constant flow case, namely the filling time and
the pressure build-up at the inlet are estimated
using a simplified analytical solution based on
Darcys Law. The flow is assumed to be one
dimensional.
RTM is a technique for manufacturing high quality
composite parts. In this process 1. Fabric
preform is placed inside mold cavity. 2. Mold is
sealed and closed. 3. Resin is injected into
mold cavity to saturate preform. 4. Resin
cures, the mold is opened and the composite part
is formed.
Calculated process parameters The filling time
340 seconds The pressure build-up at inlet
1.72107 Pa
1D Darcys Law
u flow front velocity (m/s) K fabric
permeability (m2) m resin viscosity (Pa.s) P
resin pressure (Pa)
COMPARISON BETWEEN TWO METHODS
5. Programming (using MATLAB)
2. Advantages of RTM

• With RTM, parts with the following features can
  be produced
• Lightweight with high fiber volume fraction and
  strength.
• Cost effective.
• Large in size and complex in shape.
• Good surface quality.
• Dimensional accuracy (low tolerances).
• Easy to add inserts and special reinforcements.

6. Simplified Mold Filling Simulation
3. Examples