Nonlinear - Advanced Options
The Advanced tab in the Nonlinear dialog box sets options for
controlling the solution method. This tab appears only after clicking
the Advanced Options button on
the Solution tab. The following
are the options to set on this tab (click any of them to get more information).
Method.
Sets the control technique and the iterative method to be used.
Displacement
control options.
Select a
vertex or reference point to control the analysis. Select a vertex
or a reference point to drive the solution. If you select a reference
point, the program uses the closest node to the specified point.
Displacement
component for the selected location. Displacement component. Sets
the displacement component to be used in the displacement control method.
Here is a list of valid
components.
Displacement
variation with time. Click Edit
to define a time variation of the displacement using the Time
Curve dialog box. After defining the time variation of the selected
displacement component, click Graph
to view the displacement as a function of time.
Arc-Length completion
options.
Maximum load
pattern multiplier. The maximum load-pattern multiplier at which
the solution is to be terminated (approximate value). Default is 1.0E8.
Maximum displacement
(for translational DOF). The analysis terminates if any displacement
DOF exceeds this value.
Maximum number
of arc steps. The analysis terminates if the number of arc length
steps reaches this limit. Default is 50.
Step/Tolerance
options. Sets convergence and equilibrium parameters.
Do equilibrium
iteration every ... step. Sets
the frequency of performing equilibrium in number of solution steps.
Maximum equilibrium
iterations. Sets the maximum
number of equilibrium iterations for any solution step.
Convergence
tolerance. Relative displacement tolerance used for equilibrium
convergence.
Maximum increment
strain. Sets tolerance for strain increment for models with creep
or plasticity.
Singularity
elimination factor (0-1). Sets stiffness singularity elimination
factor (normal solution if set to 1; if less than 1.0, the program modifies
stiffness terms causing singularity to
help convergence). If normal solution fails, trying a different value,
for example 0, may help convergence.
Related Topics
Nonlinear
- Solution
Flow/Thermal
Effects
Remark
What
is Nonlinear Static Analysis...