A 2024-T4 aluminum tube with an outside diameter of 2.50 in. will be used to support a 27-kip load. If the axial normal stress in the member must be limited to 18 ksi, determine the wall thickness required for the tube.
Solution:
From the definition of normal stress, solve for the minimum area required to support a 27-kip load without exceeding a stress of 18 ksi
The cross-sectional area of the aluminum tube is given by
Set this expression equal to the minimum area and solve for the maximum inside diameter d
The outside diameter D, the inside diameter d, and the wall thickness t are related by
Therefore, the minimum wall thickness required for the aluminum tube is
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