The computational scheme is an element that works only on stretching (red element).
The material properties of red element function set 13 .. Stress vs. Strain.
In nonlinear calculation (10..Nonlinear Static) to get the correct results v.11.0.1
In nonlinear calculation (10..Nonlinear Static) in v.11.1.0 received incorrect results
Solved! Go to Solution.
This change in result is due to a change in the NXN 9.0 solver. If you check the Nastran documentation, Basic Nonlinear Analysis User's Guide, under Elements for nonlinear analysis, you will find a table that shows nonlinear elastic material is not supported for CBEAM elements. I am not sure why a change was made in V9.0 to actually stop this behavior, but not issue a warning or error message.
The best workaround is to use a CROD element which does support nonlinear elastic material model.