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in JEE by (15 points)
The three bars are fastened together at their ends when the temperature is raised to 15 degree.Find the stresses in each of the material when the temperature of the whole assembly is raised to 55 degree. If at the new temperature a compressive load of 30KN is applied to the composite bar what are the final stresses in steel and alloy?

Take

ES= 200GPa

EAL= 70GPa

αs=1.2×10-5 per°C

αa=2.3×10-5 per°C

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