Surface to surface contact troubles (NX 8.5)

[j3ndys]

Hello there,
I would like to ask you for help with one my calculation. I have problem with contact behavior in my analysis. I tried various ways to solve it but without success.
I've simplified my more complex analysis just to solve this trouble. There are two bodies which are in contact on inclined surfaces with radius on the ends. One body is moving on the second.

I defined the surface to surface contact with frictional coefficient.
The contact pressure rises on too big values at the transition between the flat surface and radius. I would expect more fluent pressure distribution over the surface. There is some contact problem which I can’t to solve. Unfortunately the critical place of my analysis is exactly in this place and I will need made here stress assessment.

Pictures say more than my words.

I hope I described understandably my issue.
I will be grateful for any help.
I worked more with ansys in past and I am almost beginner in NX.

Thank you to all

 

[Tuw]

Hello j3ndys,

Are you trying to do a stamping simulation, with a punch, die and a sheet? Because from your pictures and description, it is still quite vague..

Anyway, I do think it is logical to have a change in contact pressure at the transition area between the straight and blend surface area.

Before I understand the problem further, I see the mesh size has change drastically for the die structure at the transition area. Probably this is the reason why you are getting this result.

Regards,
Tuw

 

[stressebookllc]

Are you sure you do not have any free edges? I see four elements jumping to one, the nodes may not be connected, unless I am seeing it wrong.

http://www.stressebook.com

Stressing Stresslessly!