Page 256 - Pressure Vessel Design Manual

234 Pressure Vessel Design Manual

Table 4-10
Summary of Results for Stress and Deflection in Composite Stiffeners for Sample Problem

I I I I I I I I I

tb e Check thermal expansion of bafle.
y=c --
p 2
0.85PRr, - 0.85(250) 120.938
= 7.215in. Ai = - = 0.00054 in.
tE 1.75(27.3 x lo6)
A2 = R,a AT = 120.938(7.124 x 10-6)430 = 0.370in.
A3 = 0.5h AT = 0.5(240)(7.124 x 1OP6)430 = 0.367in.
= 64.7 + 0.844 + 308.14 = 373.7in.4 A4 = A1 + A2 - A3
= 0.00054 + 0.370 - 0.367 = 0.0035 < 0.06 in.
e Check stresses and dejections. See results in Table 4-10.
Stresses and deflections are acceptable.
Check welds.

d = t, + 2tw = 0.375 + 2(0.323) = 1.02

y = 7.215 in.
I = 37~7in.~

n=2
v+ = 6681( 1.02)7.215
W=
11,200In 11,200(373.7)2
= 0.005 + 0.125 = 0.13in.

& Stiffener
I4 I
I
I
Baffle
L
YEP1
--_
-_-----__

attaching
4-18.
Details
weld
of
stiffener.
Figure