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Engineering · Civil Engineering
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Question 1.39
1.38 A steel rod, which is free to move, has a length of 200 mm and diameter of 20 mm at a temperature of 15°C. If the rod is heated uniformly to 115°C, determine the length and the diameter of this rod to the nearest micron at the new temperature if the linear coefficient of thermal expansion of steel is 12.5 x 10-6 m/m/C. Is there a stress on the rod at 115°C? 1.39 In Problem 1.38D, if the rod is snugly fitteb against two immovable nonconducting walls at a temperature of 15°C and then heated uniformly to 115°C, what is its length at 115 C? If the modulus of elasticity of steel is 207 GPa, what is the stress induced in the bar? Is this stress tension or compression?
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