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

Shells in
the reactors which we shall examine below experience
force And temperature effects. The temperature of the heat-transfer
agent in the reactor can be quite high. The wall temperature of
the shell, which touches the hot working medium, will be substantially
lower due to cooling; however, it remains nevertheless so high that
this has a noticeable effect on the mechanical and strength properties
of the shell material. The most severely heated is the wall touching
the hot working medium. It can have a temperature of 800-10000C and,
in
some cases, even higher.
The wall temperature depends greatly on its thickness. The
thicker the wall the higher its heat resistance and the higher,
consequently, its temperature and the lower the strength indices
of the material.
At high temperatures, which working media have, it is impossible
to increase the strength of the hot shell by increasing its
thickness,
This would lead to overheating, local fusion, and washing out of
metal.
Fig. 2.31.
Diagram of an element
of a two-layer cylindrical
shell.
6 f
Thus,
the shell touching the hot working medium must be rather
thin in order to provide the necessary heat transfer and to maintain
a low temperature. On the other hand, it must be sufficiently strong
P in order to maintain a pressure drop between the interhousing and
the working spaces.
14l
•g