Elements deforming before load being applied

[CAE-boomer]

Hello everyone,
I am trying to conduct a 2D Plane Strain simulation where a rigid body (the wire element) moves into the plane structure, as shown in the figure. The interaction between the wire body and the bulk is defined using a surface-to-surface interaction and the contact interaction property is 'friction' (with friction coefficient and 'hard' contact defined in it). Initially the rigid body has a gap of 0.001 mm and it travels 6 mm into the bulk body.

The problem is that, when I run the simulation the elements near the rigid body stick to the rigid body before the rigid body has even displaced. At first glance, there could be a mistake in the interaction properties but I cannot find the right solution to it. I have also tried to check out other factors in the mesh, geometry, step and BC by the process of elimination but I am still experiencing this problem.

If any information is required from my side, I would be happy to help.

Thanks in advance. Happy engineering.

 

[FEA way]

Do you have strain-free adjustment of secondary nodes enabled ? Also, check the normals on the rigid surface. They should point towards the other part.

 

[GVDR]

Hello,
You may have an adjust option activated, that will displace secondary surface nodes onto the main surface. This is a strain free initialization operation.
You may want to deactivate it altogether, with adjust=no in your card.

You can also initialize you mesh position at zero initial clearance to help with convergence.

Hope this helps!

 

[CAE-boomer]

Do you have strain-free adjustment of secondary nodes enabled ? Also, check the normals on the rigid surface. They should point towards the other part.

Hi FEA way,
Thanks for the reply.
Yes, it was a silly mistake of not checking the normals of the rigid surface. After correcting the direction of the normals, the simulation works perfectly. Thanks again for the help.