Description: Several contact controls for Abaqus/Standard have been removed from Abaqus/CAE dialog boxes and are no longer documented in the Abaqus manuals. These controls remain available through the *CONTACT CONTROLS keyword option and the Abaqus Scripting Interface.

The following contact controls are affected:

• Stabilization based on the initial contact opening distance.

• Automatic calculation of contact separation and penetration tolerances.

• Definition of a modified “hard” contact pressure-overclosure relationship, in which a certain number of nodes are allowed to violate contact conditions, including specification of

  • the number of nodes that can violate contact conditions,

  • an allowable overclosure distance before contact is enforced, and

  • an allowable “tensile” contact pressure before surfaces separate.

• Delaying the onset of frictional constraints during changes in contact state.

• Direct control over the use of Lagrange multipliers in enforcing contact constraints.

These controls are typically not necessary and are generally not recommended, although in select cases experienced users may find them useful. Quality assurance testing associated with these controls will continue. Documentation for the de-emphasized contact controls is available from ”Documentation of de-emphasized contact controls” in the Dassault Systèmes DSX.ECO Knowledge Base at www.3ds.com/support/knowledge-base or the SIMULIA Online Support System, which is accessible through the My Support page at www.simulia.com.

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