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

"+ '---_• i~l, ... ii. .. .. - - - - - - -
48 0)8- -L
0,7- - - - -07 I i'
Ih 0)5 FIJ
Op "I IZ2.01 0,"
0,2- 0,1
0 - =\,10- N
o,_i L' -- \\
0 1 2 3 1 5 6 7 8 9 o 0-2 0)2 4q 4 , 86 , 186
, •
(a)
.:(b)
Fig. 2.59. Variation in coefficients k, h, y.
Thus, knowing the values of y, we obtain the final equation'
for calculating circular perforated plates. The initial equations
(2.64) and (2.53) for the calculation will-have the folldwing form
W 6pr4,. r 2 C 4 ;
1r .- D1, " r
11 . =9 - Dy -I " .
r (2.81)
When the bending moments of an unperforatedd plate are comp uted
and it is necessary to determine the stresses in it after perforation,
in the formula of stresses (2.56) we should take the thickness of
the plate, with all3wance for perforation, hn hI, and compute2
the stresses from the formulas
rw !
For example, the stresses in a perforated plate, whose seal
has a diagram similar to the one presented in Fig. 2,57, will be:
187