Learning Forum

[dadidal96]

I'm trying to simulate an elastic plate impact with a barrier in LS-Dyna within ANSYS Workbench. To reduce the mesh size at the contact, I split the plate body into two bodies. I then used the shared topology option to create a part from these two bodies. However, when analyzing the stresses, I noticed that unequal stresses were occurring at the boundary between these bodies.
That is, the stress field becomes discontinuous. Why is this happening? How can I prevent stress differences in the shared nodes of these bodies? I apply the initial velocity to whole part. The boundary conditions are also correct. I tried both the FEM and SPG methods and got the same result.
Please help. What if I want to slice my part to create a desired mesh pattern (for instance the symmetrical mesh) but I can not do this because of this problem.

[Ram Gopisetti]

Hi, 

Please use CONTACT_NODE_TO_SEUFACE TIEBREAK with large 1e2- in Normal and Shear failure force parameters, or you can use a no-slip boundary from DEFINE_SPG_TO_SURFACE coupling by setting SBC=1. 

Cheers, Ram

[dadidal96]

Thank you for your answer! I will try to do this but why is this happening? Is it possible to solve this issue without contacts and not to divide this bodies on 2 parts? I want to keep this bodies inside one part to keep conforming mesh.