At a fabrication temperature of 60°F, steel tubes in a boiler measure 86.50 in. When the boiler is fired up, its operating temperature reaches 320°F.
(a) Find the change in length of the boiler tabes if they expand freely.
(b) Assume that the steel tubes are fully restrained so they cannot expand or contract freely. Determine the thermal stress that develops in the tubes when the boiler is at its operating temperature.
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