Problem Connecting Core with Face Plates (APDL)

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The discussion revolves around issues with an APDL model of a honeycomb sandwich panel that is not converging. The user is utilizing the NUMMRG command to connect the core and face plates but is questioning whether alternative commands might be more effective. There is a suggestion that the problem may stem from connecting shell elements to solid elements, which require careful handling of rotational degrees of freedom. The importance of relating shell element rotations to deformation at the connection points is emphasized. Overall, the focus is on troubleshooting convergence issues in finite element modeling.
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I want to connect the core and face sheets of a HC model in order to run. Also have questions about the solution not converging
Hello everyone,

I would like to know if anyone could help me with my apdl model. I have created a model of a honeycomb sandwich panel but the solution is not converging, is there something that I should pay attention to?
I have connected the core and the plates simply with NUMMRG command, should I use other commands to connect them ?
I am running a stepped solution with linear geometry.

If anyone could help I would appreciate it.

Best regards
Anton
 
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A little more details wouldn't hurt. I happen to know that APDL is the scripting language that is used by Ansys to help you set-up your FEM model. But I wouldn't consider that general knowledge. Also, I'm assuming you want to do some kind of stress analysis, but of course you can do many types of analysis.

Also, are you connecting shell elements to solids? Shell elements contain rotations in their degrees of freedom, solids do not. So you need to somehow provide a number for the rotation of the shell elements at their connection with the solids. This number is not fixed of course, it should relate to the deformation.
 

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