## General Mechanical

#### Clinching

• Wegner
Subscriber

Hello,
Does anyone could help me with clinching simulation in Ansys.
What I have got is stamping by punch in materials, but it can't make that charakteristic interlock between them.

What I have done till now:
- I design a new material and enter date of multilinear isotropic hardening, as you can see below:

- make calculations in subprogram "structural static"
- you can see what have I done below on screen

I am looking for help of anyone who have any ideas or tips how to solve that problem in Ansys.

• peteroznewman
Subscriber
• Wegner
Subscriber

I think that conversation is about how to design clinching joint.

I already have a punch and die and I want to make a full simulation as on the first post is showed.

The problem which I have is that I can't make that "interlock" between the parts.

Do you know if it is a problem with mesh sizing or some connection problems?

Or simply I have to use other simulation that "statit structural" like LS-dyna or explit dynamics?

Of course I try to do that with "large deflection" etc.

It is hard to try all options because all calculations take time.

• peteroznewman
Subscriber

Yes, these calculations are time consuming.

I suggest you try a material model with less hardening so the material can flow more easily and will not be "held back" by the stress in the material.  Use a Bilinear Kinematic Hardening model and set the Tangent Modulus to 0.

• Wegner
Subscriber

Unfortunatly it didn't help...

So I am in the same place:

Do you have any other ideas?

• peteroznewman
Subscriber

It's not clear from the plots you showhow  far away from "not working" the results are. I want to see an orthogonal view of the cut section and see the rigid surfaces as well as the deformation in the metal sheets. Without seeing that, it's not clear that the change in the material model made no difference.

One idea is to do these calculations in an axisymmetric model. The benefit is that the computation will be an order of magnitude faster, which make testing different material models or other treatments less time consuming.

When you say you are not getting the clinched result you want, is that because the simulation doesn't complete to the end or it does complete to the end but the shape is not what you want.  If it is the latter, maybe the problem is the shape of your punch and die.

• Wegner
Subscriber

I will show you that view in next post.

It is some idea to do that in axisymmetric model to make it easier and faster. I didn't do that before because it is not axisymmetrical model but I can make one and try it.

I know that everythink is fine with the model of punch and die because I did that experiment in reallity and it works and make that "interlock".