Design and Stress Analysis of Extraterrestrial ... - The Black Vault

* "1
Fig. 2.25. A: cylindrical
single-layer shell.
' -X (b)
(a)
P
A
Thus, the peripheral stress a in the walls of a cylindrical
she:ll is twice as great as ithe axial stress a Also important is
the fact that this peripheral stress is almost equal to the equivalent
stress which determines the strength and the supporting capacity of
the shell. Actu~lly, equivalent stress
*
since =k : 0.507.
I
The forniula (2.33) is widely used in rough calculations of more
pomplex design.
I
I
The safety coefficient of the shell is
found by the usual method:
SI 2
I
i(2.35)
depending upon the purpose of the element n = 1.2-1.5.
End plate of a cylindrical shell
II
Frequently single4-layer cylindrical shells have a closed shape.
One of the possible forms of the end part is a sphere with a radius
equal to the radius of the cylinder, i.e., r = R (Fig. 2.26).
* II
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