Reply To: Convergence issues: Nonlinear Buckling in Stiffened Plate on Mechanical APDL

[Andrei F L]

 

Thank you for pointing that reference. It is helping a lot in the understanding of the problem.

I did some modifications on the script, and now I am receiving the following errors:

 

 *** ERROR ***                           CP =     141.031   TIME= 19:48:41
 Element 3763 has excessive thickness change.

 *** ERROR ***                           CP =     141.062   TIME= 19:48:51
 Element 1499 has excessive thickness change.

 *** ERROR ***                           CP =     141.094   TIME= 19:48:52
 Element 3486 has excessive thickness change.

 *** ERROR ***                           CP =     141.094   TIME= 19:48:53
 Element 3925 has excessive thickness change.

 ************************************************************************
 The number of ERROR and WARNING messages exceeds 5.

 Additional messages suppressed.

The Absolute Convergence Norm vs Cumulative Iteration Number plot is this:

The updated nonlinear snippet of my script is this:

 

ANTYPE,0
NLGEOM,ON
PSTRES,1
pred,off
AUTOTS,ON
NSUBST,200,400,100,
OUTRES,ERASE
!OUTRES,ALL,1
OUTRES,ALL,ALL
TIME,6390
NEQIT,100
SFL,lines_contorno_placa_ts,PRESS,1980.9,,,
SFL,lines_contorno_placa_ls,PRESS,1980.9,,,
SFL,lines_borda_ls,PRESS,1980.9,,,
SFL,lines_borda_ts,PRESS,1980.9,,,
STABILIZE,CONSTANT,energy,0.0001
SOLVE,

Is there anything else that I can do to get rid of the ”Element 3925 has excessive thickness change” error?

Since now I thank you very much for all the help