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The choice between THERMOSET and THERMOPLASTIC matrices in composite design is driven by:
A{'text': 'Just cost', 'label': 'A'}
B{'text': 'Trade-off: thermosets are stiffer, more dimensionally stable, but irreversibly cured (no rework); thermoplastics are re-meltable and have higher impact tolerance, but typically lower stiffness/strength', 'label': 'B'}
C{'text': 'Only weight', 'label': 'C'}
D{'text': 'Thermoplastic is always better', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Trade-off: thermosets are stiffer, more dimensionally stable, but irreversibly cured (no rework); thermoplastics are re-meltable and have higher impact tolerance, but typically lower stiffness/strength', 'label': 'B'}
Aerospace primary structure → thermoset (epoxy) for stiffness, creep resistance, well-understood behavior. Newer programs (e.g. high-rate auto) prefer thermoplastic for cycle time, recyclability, post-form weldability. Each program weighs the trade-offs.
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