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# Centifugal force calc?

## Centifugal force calc?

(OP)
Looking for calculations/spreadsheet to determine the stresses in a rotating disc caused by RPM. The application is pump impellers.
Assuming a uniform disc 106" OD, 2" thick on a 14" dia shaft using 40,000 psi material design yield value, what should the rotating speed limit be?  We've got surface feet per minute limits, but the original calculations left when General Lee moved out.
I'll post this in a couple forums.
Thanks for the help!!

Keep the wheels on the ground
Bob
showshine@aol.com

### RE: Centifugal force calc?

Hi sprintcar

For a rotating disc with a central hole the formula's for
radial and hoop stress are as follows:-

Sr= (3+v)*(pw^2/8)*[R1^2+R2^2-(R1^2*R2^2/r^2)-r^2]

Sh= (pw^2/8)*[(3+v)*(R1^2+R2^2+(R1^2*R2^2/r^2)-(1+3v)r^2]

Sh=hoop stress
p=density of material
w=angular velocity
r= radius of interest ie:- where stress value is req
v= poissons ratio for the material

hope this helps

regards desertfox

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