ERROR: TOO MANY INCREMENTS NEEDED TO COMPLETE THE STEP
- Check the message file for any warning messages, such as numerical singularity or zero pivot warnings, that may be causing slow convergence
- If there appear to be no convergence issues, then you may need to increase the limit to the number of increments for that step
ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT –ANALYSIS
TERMINATED
- This is just an error message which gives reason for why Abaqus finally aborted
- Do not modify the solver controls to increase the number of allowable attempts per increment
- Check the message file for warning messages that could cause convergence difficulties
- Check the model definition, and make sure that the model can actually withstand the applied loads
ERROR: TIME INCREMENT REQUIRED IS LESS THAN MINIMUM
SPECIFIED-ANALYSIS ENDS
- Again, this is just an error message which gives reason for why Abaqus finally aborted-it is not a suggestion by Abaqus to reduce the minimum allowable increment size
- Check the message file for warning messages that could cause convergence difficulties
- Check the model definition, and make sure that the model can actually withstand the applied loads
WARNING: THE STRAIN INCREMENT HAS EXCEEDED FIFTY TIMES THE
STRAIN TO CAUSE FIRST YIELD AT 500 POINTS
- Indicates excessive plastic yielding in the given increment
- Possible causes would be:
·
Excessive or unrealistic loading (inconsistent
units, for example)
·
Incorrect or insufficient stress-strain plastic
data
·
Insufficient mesh refinement
·
Unstable deformation, such as buckling
NOTE: The factor
‘fifty’ mentioned in the warning message cannot be modified
WARNING: ELEMENT 441 IS DISTORTING SO MUCH THAT IT TURNS
INSIDE OUT
- Possible causes would be:
· Insufficient mesh refinement
· Hourglassing in first-order reduced integration elements
· Inconsistent units for material properties and/ or loads
· Excessive or unrealistic loads
· Adjusting slave nodes of severely overclosed surfaces for contact pairs or tie constraints
(initial overclosures)
WARNING: THE SYSTEM MATRIX HAS 9 NEGATIVE EIGENVALUES
- Possible causes would be:
non-equilibrium state:
. Geometrical instability: buckling, compression
. Material instability: inappropriate hyperelastic
material models, onset of perfect
plasticity
. Numerically, the use of Lagrange multipliers in
certain cases may also lead to these
warning messages
. Use of 3D second-order elements as contact
(slave) surfaces
- Typically, these warning messages do not appear in converged iterations
- Typically suggests an unconstrained rigid body motion
- Even if the analysis runs to completion with these warnings, the results may not be accurate
WARNING: SOLVER PROBLEM. ZERO PIVOT WHEN PROCESSING NODE 1
D.O.F.1
- Typically suggests an overconstraint
- Even if the analysis runs to completion with these warnings, the results will not be accurate