A 20 mm diameter steel rod passes concentrically through a bronze tube (200+Q) 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 25°C. 1. Assuming that there is no change in the thickness of the washers, if the stress produced in the steel is (200+Q) MN/m2 when one of the nuts is tightened, the pitch of the thread being 1 mm: Find the number of turns for the nut and stress in the bronze tube. 2. If the temperature of the steel and bronze is then raised to 40°C find the changes that will occur in the stresses in both materials. The coefficient of linear expansion per C is 10 x10-6 for steel and 17 x10-6 for bronze. E for steel = 210 GN/m2 and, E for bronze = 100 GN/m2.
Problem 2):
A 20 mm diameter steel rod passes concentrically through a bronze tube (200+Q) 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 25°C.
1. Assuming that there is no change in the thickness of the washers, if the stress produced in the steel is (200+Q) MN/m2 when one of the nuts is tightened, the pitch of the thread being 1 mm: Find the number of turns for the nut and stress in the bronze tube.
2. If the temperature of the steel and bronze is then raised to 40°C find the changes that will occur in the stresses in both materials.
The coefficient of linear expansion per C is 10 x10-6 for steel and 17 x10-6 for bronze. E for steel = 210 GN/m2 and, E for bronze = 100 GN/m2.
Note: Q = 39
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