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Composite Substructure

- Cocured Joints \—Composite Skin

Fig. 8.30. Final Assembly for Integrally Cocured Control Surface

Fig. 8.31. Machining Substructure Spar Mandrels and Filler Blocks

Shim on Final Assembly

Shim on Final Assembly

No Backside Reinforcement (After Cocure)

Backside Reinforcement (After Cocure)

Backside Reinforcement (Assembly)

Fig. 8.32. Spring-in for Cocured Joints

Fig. 8.33. Lay-up of Fuselage Panel with Cocured Hats Source: The Boeing Company
Fig. 8.34. Bagging Procedure for Cocured Hat Section32

diameter precured carbon pins are driven through the prepreg lay-up before cure with an ultrasonic gun.

Cobonding is a hybrid process combining cocuring and adhesive bonding. As shown in the joint in Fig. 8.37, a series of precured stiffeners are adhesive bonded to a skin at the same time the skin is cured. The surfaces of the precured composite parts must, of course, be prepared for adhesive bonding just like any other adhesive bonding process. The advantage of this process is that, in

Fig. 8.35. Cavity Tool for Precise Location of Substructure

Fig. 8.36. Methods of Reducing Hat Stiffener Peel

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