The steel swivel bushing in the elevator control of an airplane is held in place
ID: 1919968 • Letter: T
Question
The steel swivel bushing in the elevator control of an airplane is held in place using a nut and
washer as shown in Fig. (a). Failure of the washer A can cause the push rod to separate as
shown in Fig. (b). If the maximum average shear stress is ???????? = 21 ksi, determine the force F
that must be applied to the bushing that will cause this to happen. The washer is 1/16 in. thick.
The steel swivel bushing in the elevator control of an airplane is held in place using a nut and washer as shown in Fig. (a). Failure of the washer A can cause the push rod to separate as shown in Fig. (b). If the maximum average shear stress is tau max = 21 ksi, determine the force F that must be applied to the bushing that will cause this to happen. The washer is 1/6 in. thick.Explanation / Answer
the shear force acts on the washer along the circumference
r--- radius = 0.375 in
t-- thickness of washer= 1/16 in
area on which shear force acts =2*pi*r*t = 2*pi* 0.375 * (1/16)= 0.2945/2 in^2 =0.1475 in^2
force that must be applied = maximum average shear stress * area = 21*10^3 * 0.1475 = 3.0975 kilo pound
force that must be applied = 3.0975 *10^3 pound= 3.0975 kilo pound
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