Section VI.2
SECTION
VI.2 SPECIAL
PROBLEMS IN
PRESSURIZED
CABIN
STRESS
ANALYSIS: Axially-Stiffened (Semi-Monocoque) Pressure
Vessels
In an aircraft, the vertical and horizontal tail produce loads that put the
fuselage in bending. An unstiffened pressure vessel cannot carry these loads
efficiently. Hence, stringers are commonly added longitudinaly to support the
skin and create a semi-monocoque pressure vessel. At the point of attachment,
the stringer and skin, or shell, have the same strains, but different stresses.
This difference is due to the fact that skin is in a 2-D state of stress while
the stringer is in a 1-D state of stress.
The stress equations are:
where
EXAMPLE
PROBLEMS
- Example 1 Design of a semi-monocoque
cylindrical pressure vessel
To Section VI.1
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Internal Pressure