ABAQUS Volume II: I–Z - Manual (Page 503)

*SURFACE
finite-sliding contact formulation in ABAQUS/Standard or the surface is used with the contact pair
algorithm in ABAQUS/Explicit. TRIM=YES has no effect on surfaces used with the contact pair
algorithm in ABAQUS/Explicit.
TYPE
Set TYPE=ELEMENT (default) to define a free surface automatically for the elements specified or
to define a surface on the elements by using element face identifiers.
Set TYPE=NODE to define a surface by specifying a list of nodes or node set labels.
Set TYPE=SEGMENTS to create a two-dimensional analytical surface in the
plane for
planar models or in the plane for axisymmetric models by defining connected line segments.
Set TYPE=CYLINDER to define a three-dimensional analytical surface by sweeping
connected line segments defined in a local (x, y) plane along a specified generator vector.
Set TYPE=REVOLUTION to define a three-dimensional analytical surface by providing
connected line segments, which are given in an plane and are rotated about an axis.
Set TYPE=CUTTING SURFACE to generate an interior element-based surface using a cutting
plane passing through an element set. The generated surface is an approximation to the cutting
plane.
Set TYPE=USER to define an analytical surface via user subroutine RSURFU in
ABAQUS/Standard.
Additional optional parameters used for contact pair analyses in ABAQUS/Explicit:
MAX RATIO
Set this parameter equal to the upper bound of the ratio of a facet’s contact thickness to its minimum
edge (or diagonal) length. This ratio is computed after the SCALE THICK parameter is applied to
the contact thickness. The contact thickness for individual facets will be adjusted, if necessary, to
conform to this maximum ratio.
If this parameter is omitted, no upper bound will be enforced. If this parameter is included
without a value specified, the default value is 0.6.
NO OFFSET
Include this parameter to indicate that this surface will ignore the midplane offset of any shell,
membrane, or rigid elements that form the surface.
NO THICK
Include this parameter to indicate that this surface will ignore the thickness of any shell, membrane,
or rigid elements that form the surface. A surface defined with this parameter cannot be used to
define a double-sided surface or for self-contact.
SCALE THICK
This parameter applies only when the surface is used with the *CONTACT PAIR option.
Set this parameter equal to the amount by which to scale the thicknesses of the underlying
elements to compute the contact thicknesses. The default is 1.0 (i.e., no scaling).
18.46–3
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