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Simplifed Mold Filling Simulation in Resin Transfer Molding

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Aircraft Components. Tennis Racket. Chair. 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?.

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Aircraft Components

Tennis Racket

Chair

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 Darcy’s 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: 1.72*107 Pa

1D Darcy’s 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

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