Convergence is achieved when the relative unbalance is less than or equal to 1.0. The convergence tolerance at any step is computed as the product of relative convergence tolerance (1e-4) and the current magnitude of the load vector, given as:

  • Tol = relTol * max( | internalForceVector |, | externalForceVector | )

Unbalance error is calculated as:

  • Err = | internalForceVector - externalForceVector |

Convergence is achieved when Err <= Tol, or when:

  • RelErr = Err/Tol <= 1.0

RelErr is the value for relative unbalance, as reported in the log file.

See Also