Problem Connecting Core with Face Plates (APDL)

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SUMMARY

The discussion centers on issues related to connecting core and face plates in an APDL model of a honeycomb sandwich panel. The user, Anton, is experiencing convergence problems while using the NUMMRG command for connections. It is crucial to consider the differences between shell and solid elements, as shell elements include rotational degrees of freedom, which must be addressed to ensure proper connectivity and convergence in the model. Recommendations include exploring alternative commands for connections and ensuring appropriate rotational values are assigned at the interfaces.

PREREQUISITES
  • Familiarity with APDL (ANSYS Parametric Design Language)
  • Understanding of finite element modeling (FEM) principles
  • Knowledge of shell and solid element behavior in ANSYS
  • Experience with convergence issues in numerical simulations
NEXT STEPS
  • Research alternative connection commands in APDL for improved model stability
  • Learn about defining rotational degrees of freedom for shell elements in ANSYS
  • Explore techniques for diagnosing and resolving convergence issues in FEM
  • Study the implementation of stepped solutions in ANSYS for complex geometries
USEFUL FOR

Engineers and analysts working with finite element models in ANSYS, particularly those focused on composite materials and sandwich structures, as well as anyone troubleshooting convergence problems in their simulations.

Anton223
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TL;DR
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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