_______________________________________________________________________
PROBLEM (9.7) A rectangular shaft of depth a and width b is subjected to an axial tensile load P
and a torque T, as shown in Fig. P9.7. What is the largest permissible value of T if the allowable tensile
stress in the shaft is all
σ
?
Given: a = 3 in., b = 2 in., P = 30 kips, all
σ
= 20 ksi
SOLUTION
30 5
32
Pksi
A
σ
== =
×
From Table 5.1, with 1.5:ab
=
22
0.3608 (
(0.23)(3)(2)
TT TT
ab
τα
== = in .)kip in
⋅
22
1()
22 all
σσ
σ
τσ
=+ + =
22
2.5 (2.5) (0.3608 ) 20
all
T=+ + =
or
48 .
all
T kip in=⋅
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