Control parameters for Abaqus analyses

Use the Abaqus Step Control Parameters type of modeling object to control:

• The convergence control in a nonlinear solution.

• The time incrementation scheme.

The options in the Abaqus Step Control Parameters dialog box correspond to the parameters for the *CONTROLS keyword. For example, you can use the Set Analysis=Discontinuous option to set parameters that generally improve efficiency for severely discontinuous behavior, such as frictional sliding or concrete cracking. The Set Analysis=Discontinuous option allows Abaqus to complete a number of iterations before it begins any checks on the convergence rate.

In most nonlinear analyses, you should not need to adjust the options in the Abaqus Step Control Parameters dialog box. However, in complex cases, a solution may not converge using the default parameters, or the solution might require a very large number of increments and iterations. After you establish that the convergence or excessive increment issues are not due to problems with the finite element model, you can adjust the Abaqus Step Control Parameters.

For more information, see:

• Commonly used control parameters and Convergence and time integration criteria: overview in the Abaqus Analysis User’s Guide.

• *CONTROLS in the Abaqus Keywords Reference Guide.

Where do I find it?

Application	Pre/Post
Prerequisite	An active Abaqus solution
Command Finder	Modeling Objects →Type list→Abaqus Step Control Parameters
Menu	Insert→Modeling Objects→Type list→Abaqus Step Control Parameters

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