Aflywheel made of grade 30 cast iron (uts = 217 mpa, ucs = 763 mpa, e = 100 gpa, density = 7100 kg/m, poisson's ratio = 0.26) has the following dimensions: id = 150mm, od = 250 mm and thickness = 37 mm. what is the rotational speed in rpm that would lead to the flywheel's fracture?

N = 38546.82 rpm

Explanation:

= 150 mm

              = 17671.45

= 250 mm

              = 49087.78

The centrifugal force acting on the flywheel is fiven by

F = M ( - ) x ------------(1)

Here F = ( -UTS x + UCS x )

Since density,

∴ - = 50 mm

∴ F =

  F = 33618968.38 N --------(2)

Now comparing (1) and (2)

∴ ω = 4036.61

We know

∴ N = 38546.82 rpm

do you have any options?

answer:

31

explanation: