SECTION A 6.8 EXAMPLE1

Consider the single cell, thin-walled section shown made of aluminum with the given properties. With the torque T=134,400 in-lb, determine

- (a) the shear flow distribution,
- (b) the maximum shear stress and its location,
- (c) the angle of twist if L=100 in.

EQUATIONS USED

SOLUTION

**(a)** Since this ia a single-cell section, there will only be one shear
flow of constant magnitude along all webs.

Correction: The quantity shown inside the brackets is only half as opposed to the whole cell area. However, the value of q = 100 lb/in is correct as it is based on the whole cell area.

**(b)** Because the skin has two different thicknesses, there will be two different shear stresses.

Notice that the maximum shear stress is located in the thinest section. This will always be true when dealing with single cell problems.

**(c)** The angle of twist, with this shear flow distribution, will be

To Section A6.8