# Discussion Forum

## Stresses built up in a rotating disk

 Topics: 4.2, Structural Mechanics
RSS feed   |   Turn on email notifications   |   3 Replies   Last post: February 25, 2013 2:13am UTC

Shehan Haputhanthri

February 21, 2013 11:28am UTC

Stresses built up in a rotating disk

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

Nagi Elabbasi
Certified Consultant
Veryst Engineering

February 21, 2013 5:04pm UTC in response to Shehan Haputhanthri

Re: Stresses built up in a rotating disk

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 donâ€™t need to prescribe velocity in that case.

Nagi Elabbasi
Veryst Engineering

Shehan Haputhanthri

February 22, 2013 2:54am UTC in response to Nagi Elabbasi

Re: Stresses built up in a rotating disk

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
Veryst Engineering

February 25, 2013 2:13am UTC in response to Shehan Haputhanthri

Re: Stresses built up in a rotating disk

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).

Rules and guidelines