A gunmetal rod 20 mm diameter screwed at the ends passes through a steel tube 25 mm internal diameter and 30 mm external diameter. The temperature of the whole assembly is raised to 140oC and the nuts at the two ends are screwed tightly on the ends of the tube. Find the intensity of stress in the rod and tube when the common temperature has fallen to 30o C. For gunmetal αg = 18×10−6/ oC, Eg = 90GPa; and for steel αs= 12×10−6/ oC, Es = 200 GPa.
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