*SURFACE BEHAVIOR
18.47 *SURFACE BEHAVIOR: Define alternative pressure-overclosure relationships for
contact.
This option is used to modify the default hard contact pressure-overclosure relationship in a mechanical
contact analysis. Mechanical interactions normal to the surfaces are influenced by this option. It must be
used in conjunction with the*SUR FACEINTERACTION option or in an ABAQUS/Standard analysis with
the *GAP option or the *INTERFACE option. By default, ABAQUS/Standard will determine whether the
contact constraint will be enforced with or without a Lagrange multiplier. You can use the *CONTACT
CONTROLS option to override the default.
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model da ta in ABAQUS/Standard; Model or history data in ABAQUS/Explicit
Level: Part, Part instance, Assembly,Model in ABAQUS/Standard, Step in ABAQUS/Explicit
References:
•“Mechanical contact properties: overview,”Section 30.1.1 of the ABAQUS Analysis User’s Manual
•“Contact pressure-overclosurerelationships,” Section 30.1.2 of the ABAQUS Analysis User’s Manual
•*CONTACT CONTROLS
•*GAP
•*INTERFACE
•*SURFACE INTERACTION
Optional, mutually exclusiveparameters:
AUGMENTED LAGRANGE
This parameter applies only to ABAQUS/Standard analyses with a default “hard” pressure-
overclosure relationship.
Include this parameter to choose the augmented Lagrange method for enforcement of the
contact constraint. See “Constraint enforcement methods for ABAQUS/Standard contact pairs,”
Section 29.2.3 of the ABAQUS Analysis User’s Manual, for a discussion of the default penalty
stiffness and penetration tolerance associated with this method (the default penaltystiffness used
by this method is often stiffer than that with the straight penalty method). You can specify or
modify the penalty stiffness on the data line.
PENALTY
This parameter applies only to ABAQUS/Standard analyses with a default “hard” pressure-
overclosure relationship.
Include thisparameter to choose the penalty method for enforcement of the contact constraint.
See “Constraint enforcement methods for ABAQUS/Standardcontact pairs,” Section 29.2.3 of the
18.47–1
ABAQUS Version 6.1 Module: ID:
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