________________________________________________________________________
PROBLEM (11.68) Determine the allowable axial load P for an aluminum alloy 6061-T6
pipe of outer diameter 10 in. and inner diameter 8 ½ in. The pipe is used as a column of effective
length Le = 12 ft.
SOLUTION
22
(10 8.5 ) 21.79 .
4
Ai
π
2
n=−= 12 144 .
e
Lftin =
=
From Example A.4:
22 2 2
11
10 8.5 3.28 .
44
rDd=+=+=
in
144 3.28 43.89
e
Lr==
Use Eq. (11.28):
3
[20.2 0.126(43.89)]10 14.67
all ksi
σ
=− =
Hence
14.67(21.79) 320
all
Pk==ips
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