WARNING [4030]: MAXIMUM ITERATION REACHED IN AMG BEFORE SOLUTION CONVERGED

Cause

In case the AMG solver is used with the "Fix Singularity by Dummy Spring" option turned on, this warning is generated when convergence fails within the convergence tolerance required within the specified maximum number of iterations.  The results of the calculation are still saved nevertheless.  If the "Fix Singularity by Dummy Spring" option is turned off, ERROR [2116] is generated in the same situation.

Analysis Type

All types of analyses except for explicit dynamic analysis

Related Menu

Tools >> Option >> Analysis/Results >> Analysis Control >> Equation Solver...

Remedy

Check to see if the maximum number of iterations and the convergence tolerance are set to 1000 and 1e-006 respectively.  If they are not set to the default values, click the "Initialize" button at the bottom left of the dialog box to set them back to the defaults.

If the above measure does not resolve the problem, increase the maximum number of iterations or the convergence tolerance.  Also, try to fix the problem by selecting the multifrontal solver as the system of equation solver, which is a direct solver.