Answer to Question #172864 in Mechanical Engineering for George

Question #172864

3.10 A rotating thin steel cylinder is replaced by a rotating thin aluminium cylinder

of the same mass, length and wall thickness. The stress due to rotation in

the aluminium cylinder is to be 25 % of that in the steel cylinder. Calculate the

allowable speed of the aluminium cylinder if the steel cylinder rotates at 600

r/min (relative density of steel = 7,8; relative density of aluminium = 2,9)


1
Expert's answer
2021-03-23T08:04:40-0400

The force that provides the stress depends on the tangential speed of rotation at the walls of the cylinder:


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