About Convergence and Time Integration Criteria

Numerous control parameters are associated with the convergence and integration accuracy algorithms in Abaqus/Standard. These parameters are assigned default values that are chosen to optimize the accuracy and efficiency of the solution for a wide spectrum of nonlinear problems.

Modifying the Default Solution Controls

You can change the solution control parameters, as described in the following sections:

A brief synopsis of the more important solution control parameters, together with a description of the circumstances in which they can be used effectively, is provided in Commonly Used Control Parameters. This section is likely to be the most useful for the general user and should be read first.
Abaqus/Standard incorporates an empirical algorithm designed to solve the equilibrium equations of nonlinear systems accurately and economically. The criteria used to establish convergence of nonlinear increments and the automatic adjustment of increment size based on the convergence rate are described in Convergence Criteria for Nonlinear Problems.
Abaqus/Standard allows you to choose “time integration accuracy parameters” in problems that have a physical time scale. The algorithms that use these parameters for automatically controlling time increment sizes are described in Time Integration Accuracy in Transient Problems.

About Convergence and Time Integration Criteria

Modifying the Default Solution Controls

Resetting All Default Solution Controls