Rectangular bars of copper and aluminum are held by pins at their ends, as shown in the figure. Thin spacers provide a separation between the bars. The copper bars have cross-sectional dimensions 0.5 in. × 2.0 in., and the aluminum bar has dimensions 1.0 in. × 2.0 in.
Determine the shear stress in the 7/16 in. diameter pins if the temperature is raised by 100°F. (For copper, Ec = 18,000 ksi and Ec = 9.5 × 106 / °F; for aluminum, Ea = 10,000 ksi and αa = 13 × 106/°F.) Suggestion: Use the results of Example 2-8.

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Copper bar sk Aluminum bar Copper bar