Products: ABAQUS/Standard ABAQUS/CAE
Benefits: A new approach to dealing with severe discontinuity iterations (SDIs) has been added to ABAQUS/Standard. This new method is particularly effective if the contact conditions are only weakly determined and contact “chattering” occurs or if a large number of severe discontinuity iterations is required to settle the contact conditions.
Description: ABAQUS/Standard distinguishes between regular, equilibrium iterations (in which the solution varies smoothly) and severe discontinuity iterations (SDIs) in which abrupt changes in stiffness occur. The most common of such severe discontinuities involve open-close changes in contact and stick-slip changes in friction. By default, ABAQUS/Standard will continue to iterate until no severe discontinuities occur and the equilibrium (flux) tolerances are satisfied. Alternatively, you can now choose a different approach in which severe discontinuities are converted into force residuals. In this case ABAQUS/Standard will stop iterating when the residual tolerances are satisfied, even if severe discontinuities occur.
Step module: Step editor: Other: Convert severe discontinuity iterations: On