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Stresses built up in a rotating disk

Shehan Haputhanthri
I am trying to analyze the stresses built up in in rotating disk. This disk is not subjected to any external loading. Only forces applied is centrifugal forces due to rotation.

When I try to model the problem using Structural Mechanics>Solid Mechanics (solid) from COMSOL 4.2 it allows me to enter a linear velocity as a Prescribed Velocity. But I cant enter the rotational or angular speed.

Can I implement this problem in COMSOL using this Prescribed Velocity functionality?or Is there any other way to analyze the stresses in this rotating disk.?

Thank You Very Much.

Shehan

3 Replies Last Post Feb 24, 2013, 9:13 PM EST
Nagi Elabbasi Certified Consultant
Posted: 5 years ago Feb 21, 2013, 12:04 PM EST
Hi Shehan,

The most efficient way to calculate the stresses due to a steady-state centrifugal load is through a body load = density x omega^2 x radius. You don’t need to prescribe velocity in that case.

Nagi Elabbasi
Veryst Engineering
Hi Shehan, The most efficient way to calculate the stresses due to a steady-state centrifugal load is through a body load = density x omega^2 x radius. You don’t need to prescribe velocity in that case. Nagi Elabbasi Veryst Engineering

Shehan Haputhanthri
Posted: 5 years ago Feb 21, 2013, 9:54 PM EST
Thanks Nagi for your quick reply. I did the simulation that way and got the results.

I applied the body load in the r direction (In cylindrical coordinate system). What I am not sure here is whether I should applied the loads in all three direction.

Thanks.
Thanks Nagi for your quick reply. I did the simulation that way and got the results. I applied the body load in the r direction (In cylindrical coordinate system). What I am not sure here is whether I should applied the loads in all three direction. Thanks.

Nagi Elabbasi Certified Consultant
Posted: 5 years ago Feb 24, 2013, 9:13 PM EST
If you apply the load in a cylindrical coordinate system aligned with the axis of rotation then you only need to apply a force in the radial direction (as you did).
If you apply the load in a cylindrical coordinate system aligned with the axis of rotation then you only need to apply a force in the radial direction (as you did).

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