Learning Forum

[javat33489]

Hi all.

How to deal with the problem when the stress concentrator occurs on a sharp edge? For example, I count the teeth in engagement and when using the hexa mesh, I constantly show very high stress on a sharp edge. Very often this is on hexa grids. The tutorial says that this area needs to be crushed even more, but this does not help.

Thank you.

[Armin Abedini]

Hi Javat, 

Would you be able to refine your mesh locally (in the high stress area) for better resolution? Could you increase the radius of the corner to reduce stress concentration? A very helpful lesson on how to deal with artificially high stresses can be accessed via the link below:

Understanding and Dealing with Artificially High Stresses — Lesson 3 - ANSYS Innovation Courses 

[javat33489]

Thank you I saw this video. I did rounding, it does not help. Here I tried the tetra grid

[Armin Abedini]

Hi Javat,

Please note that stress concentration also depends on how the loading is applied (explained further in the video I sent you earlier). Depending on how you applied the load, that may also benefit from increasing the radius of sharp tips in a contact scenario, for example.
In some applications, it may not be possible to totally eliminate stress concentration, but it might be possible to "reduce" it. From your images, I can see that the peak stress level has been decreased by rounding the corner.