Thermo-Mechanical Analysis of Airplane Carbon-Carbon Composite Brakes

Using MSC.MarcZ. Wolejsza, A. Dacko, T. Zawistowski, J.

Osinski

Wheel – Brake Assembly

Tests

Experimental Data

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

0

1

2

3

4

5

6

7

8

0

100

200

300

400

500

600

700

800

M h [daNm ]

F[daN]

t [s]

Braking m oment

Load (pressure)

FE Model for MSC. Marc

• Axisymmetrical thermo-mechanical problem (transient)

• 5 stators + 4 rotors (C/C composite, mechanical and thermal orthotropy)

• Friction-generated heat fluxes input fromuser subroutine

• Partial use of experimental data (eg. friction)• Convection and radiation

FE Model for MSC.Marc

FEA Results

FEA Results

FEA Results

FEA Results

• Pressure distribution along contact line (radiuswise) variation in time

FEA Results

Temperature on second stator Temperature variation in vicinity of piston

Conclusions

• Strong nonuniformity of contact stress• Resulting highly nonuniform temperature

distribution• Clear influence of material orthotropy