Discussion
Match each composite design issue in List I with its remedy in List II.
List I
A. Galvanic corrosion at an aluminium interface
B. Poor lightning conduction
C. Extension-bending coupling
D. Reduced strength when hot and wet
List II
1. A conductive mesh in the outer surface
2. A glass fibre interleaf or sealant
3. A knock-down applied to the design allowable
4. A symmetric stacking sequence
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Each problem has its standard remedy. A glass fibre interleaf or sealant breaks the electrical path that would otherwise corrode the aluminium. A conductive mesh in the outer surface conducts lightning current away. A symmetric stacking sequence makes the B matrix vanish and removes extension-bending coupling. And the hot-wet strength reduction is handled by applying a knock-down to the allowable.
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