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Engineering · Civil Engineering
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7. The bimetallic thermal control shown in the Figure below is made of a brass bar (Length Lub-20 mm and cross sectional area Ab- 65 mm2) and a magnesium bar (Length Lam- 30 mm and cross sectional area A 130 mm2). The two bars are arranged so that the gap between their free ends is 0.1 mm at room temperature. Use the following material properties: ab 9.1 x 10 e/oC, am 26.1 x 10%C, Eb 03 GPa., and E 45 GPa. Calculate a.) The temperature increase AT(above the room temperature) at which the two bars come into contact b.) The stress o in the magnesium bar when the temperature increase AT 50 oC. Am Ab Lm

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