cmat default command


contact cmat default <type stype > keyword ...

Primary keywords:

inheritance    mechanical    method    model    property    proximity    thermal    type

Set the default slot(s) of the CMAT. Attempts to assign the following information to the default slot(s) of the CMAT. If the optional keyword type is issued, then it must be followed by a valid contact type name, and the corresponding default slot of the CMAT will be modified. If no type is specified, then the command will attempt to modify all the default slots.

By default, only mechanical contacts are considered.

inheritance keyword b ...

The inheritance flag for the contact model property is set to b. The property must support inheritance.


Apply to mechanical contacts.

method keyword ...

The contact model method sm, along with its specific list of pairs of argument names and values (sa, a) (if applicable), is registered with the selected default slot(s) and will be invoked at contact creation.

model keyword

Specify the default model. The default slot(s) will not be modified if the corresponding contact type(s) cannot use the specified contact model.

The list of built-in mechanical contact models is given in the “Built-in Contact Models” section. Users may also implement custom contact models (see “User-Defined Contact Models” for further information) and register them in the CMAT.


Specify the Adhesive Rolling Resistance Linear Model contact model.


Specify the Bilinear Contact Model contact model.


Specify the Burger’s Model contact model.


Specify the FISH Model contact model.


Specify the Flat-Joint Model contact model.


Specify the Hertz Model contact model.


Specify the Hysteretic Model contact model.


Specify the Linear Model contact model.


Specify the Linear Contact Bond Model contact model.

lineardipole (3D ONLY)

Specify the Linear Dipole Model contact model.


Specify the Linear Parallel Bond Model contact model.


Specify the Null Model contact model.


Specify the Rolling Resistance Linear Model contact model.


Specify the Smooth-Joint Model contact model.


Specify the Soft-Bond Model contact model.


Specify the Spring Network Model contact model.


Specify the Subspring Network Model contact model.

property keyword <inheritance b > ...

Specify the contact model property. If the optional inheritance is issued, then the property must support inheritance and a boolean must follow indicating its inheritance flag.

proximity fd

The detection distance is set to fd.


Apply to thermal contacts.

type keyword

Specify that this CMAT entry applies to contacts of the specified type. This can also be accomplished with the contact range element.


Specify that this is the ball-ball default CMAT entry.


Specify that this is the ball-facet default CMAT entry.


Specify that this is the ball-pebble default CMAT entry.


Specify that this is the ball-rblock default CMAT entry.


Specify that this is the pebble-facet default CMAT entry.


Specify that this is the pebble-pebble default CMAT entry.


Specify that this is the pebble-rblock default CMAT entry.


Specify that this is the rblock-facet default CMAT entry.


Specify that this is the rblock-rblock default CMAT entry.

Usage Examples

Set the default entry to the linear model with the specified properties.

contact cmat default model linear prop dp_nratio 0.8 dp_mode 1

from “BlenderBalls.dat” in Ribbon Blender

Set the default entry to the rrlinear model with the specified properties and methods.

contact cmat default model rrlinear method deformability ...
                                    emod        [emod]   ...
                                    kratio      [kratio] ...
                           property fric        [fric]   ...
                                    dp_nratio   [dpnr ]  ...
                                    dp_sratio   [dpsr]   ...
                                    dp_mode     [dpm]    ...
                                    rr_fric     [rfric]

from “make_system.dat” in Rolling Resistance Linear Contact Model: Repose Angle

Set the default entry to the linearpbond model with the specified properties and methods.

contact cmat default model linearpbond method deformability ...
                     emod [materialMod] kratio 1.0

from “PunchIndentation.dat” in Punch Indentation of a Bonded Material (FLAC3D)