Discussion
Consider the following statements about cabin pressurisation loads:
1. The hoop stress is twice the longitudinal stress in a thin cylindrical shell.
2. The loading is cyclic, once per flight, and drives fuselage fatigue.
3. The rear pressure bulkhead carries no axial load.
Which of the statements given above is or are correct?
Answer: D
The first two are correct and between them explain why fuselage fatigue receives so much attention. The third is plainly false: the bulkhead reacts the pressure over its whole projected area, which for a 2 m radius at 55 kPa is nearly 700 kN.
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