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The fundamental MOTIVATION for using composites in spacecraft and aircraft is:
A{'text': 'Lower manufacturing cost', 'label': 'A'}
B{'text': 'Better corrosion than aluminum', 'label': 'D'}
C{'text': 'High SPECIFIC strength (strength/density) and specific stiffness (modulus/density) — composites can beat metals on a weight-normalized basis', 'label': 'B'}
D{'text': 'Easier repair', 'label': 'C'}
Answer & Solution
Correct answer: C. {'text': 'High SPECIFIC strength (strength/density) and specific stiffness (modulus/density) — composites can beat metals on a weight-normalized basis', 'label': 'B'}
Aerospace prioritizes weight: CFRP achieves specific strength ~2-3× steel and specific stiffness ~2× aluminum. The Boeing 787 is ~50% composites by weight, saving fuel and enabling pressure-differential designs.
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