Sealing lip deformation / assembly

[rubber25]

@wlh70

Which Shore hardness would you like to use?

My goal was to make a simulation in 40ShA and 60ShA.

[rubber25]

@FEAnalyst

Did you try with linear elasticity just to see if it works ? Sometimes it even makes sense to reduce the mesh density in some areas (possibly away from contact) to avoid element distortions. Basically, you may have to predict the deformation pattern and adapt the mesh in advance for that.

Sorry I am new in the FEA topic What do you mean by that?

I tried different mesh versions with less points and also with more points in the bending area / radius.

But it failed.

[rubber25]

@FEAnalyst

Please avoid direct incrementation. I carried out several tests before I realized it’s enabled again.

Ok I will do that. But when I switch to automatic, it finishes the calculation without error but it dosent go the movement I defined in the BC

[rubber25]

@FEAnalyst

Hopefully, when you can post on the CalculiX forum, the devs will suggest some ways of handling these instabilities. In my opinion they are erroneous in many such contact problems.

Done

Sealing lip deformation / assembly problem - Analysis issues - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).

[FEAnalyst]

@rubber25

My goal was to make a simulation in 40ShA and 60ShA.

Then you could use for example:

40A_hyper c10= 0.181 MPa c01= 0.045 MPa
60A_hyper c10= 0.474 MPa c01= 0.118 MPa

@rubber25

Sorry I am new in the FEA topic What do you mean by that?

In short words, in such cases, you may need to check or even just imagine how the rubber part will deform and how its finite elements may distort. Then remesh in such a way that their initial size and shape is less likely to distort so much.

I’ve also tried different configurations, but there is some incorrect behavior in the region where it bends and needs self-contact.

[FEAnalyst]

@rubber25

Ok I will do that. But when I switch to automatic, it finishes the calculation without error but it dosent go the movement I defined in the BC

I’ve also noticed this behavior. It’s some bug that makes PrePoMax think the analysis is finished. Sometimes it really finishes, but with a broken (distorted) mesh.

@rubber25

Done

Sealing lip deformation / assembly problem - Analysis issues - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).

Thanks. We have some issues with the solver here so let’s see what they say. Maybe I will also contact Guido (CalculiX dev) directly. And we should report it on GitHub if any bug is confirmed.