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A solid aluminum shaft of diameter 80 mm fits concentrically inside a hol- low tube. Compute the minimum internal diameter of the tube so

A solid aluminum shaft of diameter 80 mm fits concentrically inside a hol- low tube. Compute the minimum internal diameter of the tube so that no contact pressure exists when the aluminum shaft carries an axial compressive force of 400 kN. Use v = 1/3 and E= 70 GPa for aluminum.

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