Page 379 - Aircraft Stuctures for Engineering Student

360 Open and closed, thin-walled beams

4450 N A
v v

n a

$4450 N
I- -- _- +

Fig. P.9.28(b)

Take E = 69 000 N/mm2 and G = 26 700 N/mm2
Boom areas: 1, 3,4, 6 = 650mm2, 2, 5 = 1300mm2

Am. 3.4mm.
P.9.29 A cantilever, length L, has a hollow cross-section in the form of a doubly
symmetric wedge as shown in Fig. P.9.29. The chord line is of length c, wedge
thickness is t, the length of a sloping side is a/2 and the wall thickness is constant
and equal to to. Uniform pressure distributions of magnitudes shown act on the

t/2
I
,i
t/2
1

i 1.2po/unit area polunit area
--
4 +
c/2 c/2

Fig. P.9.29