A 20 ft-long wing with uniform cross section shown above supports a pure torque

Question

A 20 ft-long wing with uniform cross section shown above supports a pure torque of 50,000 in-lb. The three vertical spar webs all have a thickness of 0.08 in., and the skin on the top, bottom, and leading edge surfaces has a thickness of 0.05 in. The material used in all components is aluminum. E = 10 x 106 psi, and G = 4 x 106 psi.

(a) Find the shear flows that are produced in all the webs. Show the shear flows on a sketch of the cross section.
(b) Determine the total twist angle for the 20-ft length.

Explanation / Answer

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