- #1
Vr6Fidelity
- 11
- 0
Stress' in rotating discs. HELP!
I am working on an independent project where I am analyzing the maximum possible angular velocity of a solid disc of a given diameter and material.
The Diameter is 6.75"
Material is 440c
E= 29,000 Ksi
Density of .275lb/in^3
Ultimate tensile strength: 294,426 Psi (294Ksi)
How fast can this rotate?
Part2:
How do I quantify the stress concentration of RADIAL holes in this disc? I have found numerous papers on eccentric holes but not radial on the periphery. Holes are blind and tapped.
Maximum speed should be around 40K-60K RPM.
I have been using these formulas:
https://www.physicsforums.com/latex_images/14/1425557-0.png
https://www.physicsforums.com/latex_images/14/1425557-1.png
I have taken R to be zero for radial stress (the center)
and 3.375 for tangential stress.
I originally used the ultimate stress and solved for omega, but those results were 10x lower than realistic.
So i used E, and the results seem reasonable. Although I am not sure WHY I had to use E or if this was the right thing to do.
Can I get some assistance? Thanks.
I am working on an independent project where I am analyzing the maximum possible angular velocity of a solid disc of a given diameter and material.
The Diameter is 6.75"
Material is 440c
E= 29,000 Ksi
Density of .275lb/in^3
Ultimate tensile strength: 294,426 Psi (294Ksi)
How fast can this rotate?
Part2:
How do I quantify the stress concentration of RADIAL holes in this disc? I have found numerous papers on eccentric holes but not radial on the periphery. Holes are blind and tapped.
Maximum speed should be around 40K-60K RPM.
I have been using these formulas:
https://www.physicsforums.com/latex_images/14/1425557-0.png
https://www.physicsforums.com/latex_images/14/1425557-1.png
I have taken R to be zero for radial stress (the center)
and 3.375 for tangential stress.
I originally used the ultimate stress and solved for omega, but those results were 10x lower than realistic.
So i used E, and the results seem reasonable. Although I am not sure WHY I had to use E or if this was the right thing to do.
Can I get some assistance? Thanks.
Last edited by a moderator: