Problem in contact analysis

[Tinni1]

Hi,

I am doing dynamic explicit analysis using contact.

I want to simulate column buckling behavior. The column is a lipped channel section. It is located inside a small piece of track sections both at the top and bottom. I have modeled both the track and the column section with 3D deformable shell elements.
The stud and track assembly is connected to two rigid plates at the top and bottom.
The boundary condition and load have been applied at the reference point of the rigid plate.

I have applied tie constraint and general contact condition with penalty friction =0.2
After running the analysis I got below warning:
1. Some nodes involved in general contact have penetrated their tracked faces by more than 50.000 percent of the typical element dimension in the general contact domain, 2.8198. Please check the node set "InfoNodeDeepPenetFirst". Please make sure that these nodes and their contacting faces have sufficient mass to allow the code to calculate realistic contact penalties for enforcing the contact constraint.
2.All nodes involved in general contact that have undergone deep penetration of their tracked faces during this step have been listed in node set "InfoNodeDeepPenetAll". Please make sure that these nodes and their contacting faces have sufficient mass to allow the code to calculate realistic contact penalties for enforcing the contact constraint.

The snaps of the problematic zone is attached herewith. Could you please suggest, how to resolve this issue?

Many thanks!

 

[FEA way]

Take a closer look at this problematic region with all parts displayed, check both the initial state (before the analysis) and the one displayed in postprocessing. There might be some initial overclosures that should be resolved on the modeling stage (taking into account shell thickness). Abaqus/Explicit tries to automatically adjust the nodes on the contact surfaces to remove penetrations but it may not work properly if those penetrations are too large.