Assigning Contact Properties
The default contact property model in Abaqus/Explicit assumes “hard” contact in the normal direction, no friction, no thermal interactions, etc. You can assign a nondefault contact property definition (surface interaction) to specified regions of the general contact domain. These regions are identified with surface names or material names. For example, contact property ContProp_A can be assigned to the combination of surface Surf_1 and the surface whose underlying elements have a section assignment with material Rubber. Surfaces associated with Surf_1 and Rubber can span multiple parts.
Contact property assignments propagate through all analysis steps in which the general contact interaction is active.
The surface names used to specify the regions where nondefault contact properties should be assigned do not have to correspond to the surface names used to specify the general contact domain. In many cases the contact interaction will be defined for a large domain, while nondefault contact properties will be assigned to a subset of this domain. Any contact property assignments for regions that fall outside of the general contact domain will be ignored. The last assignment will take precedence if the specified regions overlap.
Input File Usage
CONTACT PROPERTY ASSIGNMENT surface_1 or material_1, surface_2 or material_2, interaction_property_name, SURFACE (default) or MATERIAL, SURFACE (default) or MATERIAL
This option must be used in conjunction with the CONTACT option. It should appear at most once per step; the data line can be repeated as often as necessary to assign contact properties to different regions.
If the first entry is omitted, a default surface that encompasses the entire general contact domain is assumed.
If the second entry is omitted or is the same as the first entry, contact between the first named or implied surface and itself is assumed. Keep in mind that surfaces can span multiple unattached bodies, so self-contact of a surface is not limited to contact of a single body with itself.
If the interaction property name is omitted, the unnamed set of default contact properties in Abaqus/Explicit is assumed. If an interaction property name is specified, it must also appear as the value of the NAME parameter on a SURFACE INTERACTION option in the model portion of the input file.
The fourth and fifth entries indicate whether the first and second entries, respectively, refer to surface or material names. If omitted, Abaqus assumes that a surface name is used.
Example
The following contact property assignments are specified below for the first step in a general contact analysis:
-
a global assignment of
contProp1to the entire general contact domain; -
a local assignment of
contProp2to self-contact forsurf1; -
a local assignment of the default Abaqus contact property to contact between
surf2andsurf3; and -
a local assignment of
contProp3to contact between the entire contact domain andsurf4.
SURFACE INTERACTION, NAME=contProp1 FRICTION 0.1 SURFACE INTERACTION, NAME=contProp2 FRICTION 0.15 SURFACE INTERACTION, NAME=contProp3 FRICTION 0.20 STEP Step1 DYNAMIC, EXPLICIT … CONTACT CONTACT INCLUSIONS, ALL EXTERIOR CONTACT PROPERTY ASSIGNMENT , , contProp1 surf1, surf1, contProp2 surf2, surf3, , surf4, contProp3