Discussion
Adding a longitudinal pressurisation stress of \( 34 \) MPa to that bending stress gives a total longitudinal stress of
Answer: D
Correct answer: 133 MPa
Both act along the fuselage axis, so they add directly:
\[ 99 + 34 = 133 \ \mathrm{MPa} \]The combined figure is a third higher than bending alone, which is exactly why the two cases must be assessed together. The hoop stress, twice the longitudinal pressurisation stress, acts at right angles and is brought in through the failure criterion rather than by addition.
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