STRESS PRINCIPAL (Sp+)

General Questions
1

Hi,
It is possible to display the Sp+ by differentiating each face of a thin plate in bending (one is working in tension, the other in compression).
Thanks

Sp+
Sp+693Ă—1070 26.8 KB

2

Do you mean that you want to calculate the difference between the principal stress at the top and bottom face from a plot like this?

principal
principal1335Ă—635 79.8 KB

2 Likes
3

Hi @FEAnalyst ,
I want to see the Sp+ on each side, separately. Show the Sp+ on the top face (only), and on the bottom face (only). It’s not the difference.
I can do this, for example, in Ansys, by selecting the face and displaying the Sp+
But I’m interested in knowing how to show the Sp+ difference, and what reading can be made of that result
Thanks

4

Ok, I see. There’s no easy way to do it in PrePoMax but you can define a node set for each face and then add a custom keyword like this:

*El file, Nset=node_set_name
S

Then the stresses will be calculated only for the specified node set but you will still see extrapolation to the rest of the model:

image
image810Ă—581 45 KB

Of course, you can apply section view to see only the region close to the surface.

Or, another workaround could be to add a thin membrane part to each face and tie it to the solid so that you can later display the stresses only in the selected “skin”.