A 25 mm diameter steel rod passes concentrically through a bronze tube 400 mm long, 50 mm external diameter and 40 mm internal diameter. The ends of the steel rod are threaded and provided with nuts and washers which are adjusted initially so that there is no end play at 20°C. (a) Assuming that there is no change in the thickness of the washers, find the stress produced in the steel and bronze when one of the nuts is tightened by giving it one tenth of a turn, the pitch of the thread being 2.5 mm. (b) If the temperature of the steel and bronze is then raised to 50°C find the changes that will occur in the stresses in both materials. The coefficient of Linear expansion:

18x 10 ^-6 °C and 11 x10 ^-6 °C for bronze 10 ^-6 . E for steel = 200 GN/m². E for bronze = 100 GN/m² °C.

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a Let x be the stress in the tube resulting from the tightening of the nut and oR the stress fo... View the full answer