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

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In critical structures the small overstressing at.point A can
be compensated by structural methods. An effort is made not to locate
S'I the welding . seams oft the end plate at a bending point of the shells
(Fig. 2.30a).; sometimes the reýnforcing ring is introduced dt a
sharp angle (Fig. 2.30b).
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0) 25R O ,25R
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P=2R
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(a)
(b)'
Fig. 2.30. Structural diagram of couplings. ,
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Such structural methods provide a uniformly strong structure
for" the'end plate and e.liminate the need for additional stress
analyses.
If; however, additipnal stresses canndt be avoided, the
safety coefficient must be evaluated according to the -usual formula
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n
121 max
where n = 1.2-1.5 dependink upon the specific conditions.
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-Supporting capaclty of a two-layericylindrical she'll
We anhlyze the twos-layer shell whose element is shown in Fig. 2.31
for supporting ability based on zero-moment theory.' We shall examine.
the joint deformation 9f nonidentically heated shells, coninected by
rigid longitudinal bonds.
The type of bond has no effect on the
t6tal supporting capacity. UsuallyI the rigidity of bonds is comparativly
high although structurally they can be made quite
differently.
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