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

of the heat-transfer agcnt or the coolant. This affects the value
of the full load acting on the plate, as well as the rigidity and
supporting capacity, and must be allowed for in calculations.
Let us estimate Lhe pressure decrease of the plate due to its
perforations. If' the pressure drop on the plate p is known, then
2
the force on a continuous plate (Fig. 2.56) P = prb
The force acting on part of the plate, with allowance for the
decrease in its surface due to perforatlons, is
i.[ ~ ~~P. 11 (bM-nr)
where r and n are the radius and number of openings in
elements for the passage of the heat transfer agent.
the fuel
Equivalent to this force, the conditional piessure which
acts on the perforated part of the plate, if we assume it is con-
2 2 2
tinuous, we find from the expression Pn= plr(b - nr 2 p bn:
nr2N
p 1--~i p
(2.77)
then
If the entire load-oearing plate is covered with openings,
The diagram of pressures on the load-bearing plate, thus, nas
a stepped character, and we shall deal with the analysis of a plate
with variable loading. Usually the radius at bn is near b; therefore,
pressure p is assumed constant.
Let us evaluate the reduction in plate rigidity.
183