The symptoms of almost all convergence problems can be found
in the message(.msg) file. The printed output(.dat) and status(.sta) files may
also provide hints about certain issues
The following message in the message file,
***WARNING: THE SOLUTION APPEARS TO BE DIVERGING
is not the cause of a convergence problem-it is a reason for
Abaqus to cut back the increment size.
However, such a warning might be the symptom of a
convergence problem in the model.
It also might be because too large an increment was used.
The following are some warning messages that appear in the
message file and which may be symptoms of a convergence problem
***WARNING: THE STRAIN INCREMENT HAS EXCEEDED FIFTY TIMES
THE STRAIN TO CAUSE FIRST YIELD AT 7 POINTS
***WARNING: THE SYSTEM MATRIX HAS 3 NEGATIVE EIGENVALUES
***WARNING: ELEMENT 441 IS DISTORTING SO MUCH THAT IT TURNS
INSIDE OUT
***WARNING: THE SOLUTION APPEARS TO BE DIVERGING
***WARNING: OVERCLOSURE OF CONTACT SURFACES SURF_A AND
SURF_B IS TOO SEVERS—CUTBACK WILL RESULT
***WARNING: SOLVER PROBLEM. ZERO PIVOT WHEN PROCESSING NODE
D.O.F.1
***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN
PROCESSING NODE 15 D.O.F 2 RATIO-3.14159E+15
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