Discussion
A fibre volume fraction rises from \( 0.55 \) to \( 0.62 \). The longitudinal modulus, with \( E_f = 230 \) and \( E_m = 3.5 \) GPa, rises by about
Answer: B
The change is essentially \( (0.62-0.55) \times (230 - 3.5) = 0.07 \times 226.5 = 15.9 \) GPa. Control of fibre volume fraction therefore matters a great deal, which is one of the arguments for prepreg over wet lay-up.
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