Guys,

How do you evaluate the stress result of FEA? We usually need to compare the existing/new design and see how much advantage we get from new design. But I have no idea how to general a report to my boss how much better I have done on stress.

In displacement, we can easily give a result like % advantage = 1 - max displacement of new design / max displacement of existing design.

But I can't do this to stress. Any idea about this?

Thanks,

Hi jack,

I think if you want to compare the stresses I would suggest you to compute sumation of squares of the stress in all three orthogonal directions i.e x,y z all the normal/principle stresses which should be equal to resultant stresses .

use this formula

(S1-S2)^2 + (S2-S3)^2 + (S3-S1)^2 = 2 Se^2

where

S1 ---- Stresses in X -direction -----these are calculated by boundary conditions applied you can get each of these from solidworks

S2------ Stresses in Y -direction

S3------- Stresses in Z-direction

& Se is Resultant/Equivalent stresses across the model

Hope this will help you & let me know if it works or not