Section A16.5 example 1
SECTION
A16.5 EXAMPLE
1
Consider a semi-monocoque cylindrical pressure vessel with a diameter of 78
inches. The skin and stringers are made of the same material with an ultimate
normal stress of 60,000 psi, an ultimate shear stress of 8,000 psi, and a
Poisson's ratio of 0.3. We are using 10 identical stringers with the total
area equal to 40% of the skin cross sectional area. For internal gauge pressure
of 15 psi with yield factors of safty of 1.5 in tension and 2 in shear,
determine:
- the pressure vessel's minimum skin thickness
- the cross sectional area of each stringer
EQUATIONS
USED
SOLUTION
We find the skin thickness based on the stress allowables in the skin.
We will repeat the procedure based on the stress allowables in the stringer.
The minimum thickness is then found to be the one that does not violate any of
the stress criteria
The area of each stringer is found using
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