Discussion
The chief advantage of composites over metals in airframe structure is
Answer: B
Correct answer: High specific stiffness, tailorable by layup
Two things are being claimed at once. Carbon composite gives more stiffness per unit mass than aluminium along the fibres, and because the designer chooses the ply angles and their proportions, that stiffness can be placed where the loads are rather than being the same in every direction. Repair, inspection and material cost all go the other way, which is the price paid.
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