43
2
a
b
Crack
Resin impregnated reinforcing fabric
Pressure / Temperature
Pressure / Temperature
Cutting of steps
c
d
. Fig. 2.14 a Cracked composite, b cutting of steps at cracked surface, c placement of resin-impregnated reinforcing
fabric, and d curing of composite layup
Compressed air
Vacuum line to repair patch
Thermocouples
Repair patch
Vacuum bag
Heater mat
Output to
heater mat
Hot bond unit
Power supply
. Fig. 2.15 Typical hot bonder portable unit [32]
2.2 · Disadvantages of Composites