NodalFrictionalConstraint

Frictional nodal constraint for contact

Only a penalty formulation is implemented. First, the previous time step tangential force is computed as:

If it is greater than the allowed frictional force (normal force times the friction coefficient), then the local nodes are in the slippage regime and the old force is recomputed as:

From the previous time step force , and the previous and current values of on the primary and secondary side, the current force is computed as:

If it is greater than the allowed frictional force (normal force times the friction coefficient), then the local nodes are in the slippage regime and the current force is recomputed as:

and the opposite on the secondary side, where is usually the displacement component variable value for mechanical contact applications.

commentnote

The primary and secondary variables must be different for this implementation of the nodal frictional constraint.

Input Parameters

  • boundaryThe primary boundary

    C++ Type:BoundaryName

    Unit:(no unit assumed)

    Controllable:No

    Description:The primary boundary

  • friction_coefficientFriction coefficient for slippage in the normal direction

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Friction coefficient for slippage in the normal direction

  • normal_forceNormal force used together with friction_coefficient to compute the normal frictional capacity.

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Normal force used together with friction_coefficient to compute the normal frictional capacity.

  • secondaryThe secondary boundary

    C++ Type:BoundaryName

    Unit:(no unit assumed)

    Controllable:No

    Description:The secondary boundary

  • tangential_penaltyStiffness of the spring in the tangential direction.

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Stiffness of the spring in the tangential direction.

  • variableThe name of the variable that this residual object operates on

    C++ Type:NonlinearVariableName

    Unit:(no unit assumed)

    Controllable:No

    Description:The name of the variable that this residual object operates on

Required Parameters

  • formulationpenaltyFormulation used to calculate constraint - penalty or kinematic.

    Default:penalty

    C++ Type:MooseEnum

    Unit:(no unit assumed)

    Options:penalty, kinematic

    Controllable:No

    Description:Formulation used to calculate constraint - penalty or kinematic.

  • variable_secondaryThe name of the variable for the secondary nodes, if it is different from the primary nodes' variable

    C++ Type:NonlinearVariableName

    Unit:(no unit assumed)

    Controllable:No

    Description:The name of the variable for the secondary nodes, if it is different from the primary nodes' variable

Optional Parameters

  • absolute_value_vector_tagsThe tags for the vectors this residual object should fill with the absolute value of the residual contribution

    C++ Type:std::vector<TagName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The tags for the vectors this residual object should fill with the absolute value of the residual contribution

  • extra_matrix_tagsThe extra tags for the matrices this Kernel should fill

    C++ Type:std::vector<TagName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The extra tags for the matrices this Kernel should fill

  • extra_vector_tagsThe extra tags for the vectors this Kernel should fill

    C++ Type:std::vector<TagName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The extra tags for the vectors this Kernel should fill

  • matrix_tagssystemThe tag for the matrices this Kernel should fill

    Default:system

    C++ Type:MultiMooseEnum

    Unit:(no unit assumed)

    Options:nontime, system

    Controllable:No

    Description:The tag for the matrices this Kernel should fill

  • vector_tagsnontimeThe tag for the vectors this Kernel should fill

    Default:nontime

    C++ Type:MultiMooseEnum

    Unit:(no unit assumed)

    Options:nontime, time

    Controllable:No

    Description:The tag for the vectors this Kernel should fill

Tagging Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

    C++ Type:std::vector<std::string>

    Unit:(no unit assumed)

    Controllable:No

    Description:Adds user-defined labels for accessing object parameters via control logic.

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:Yes

    Description:Set the enabled status of the MooseObject.

  • implicitTrueDetermines whether this object is calculated using an implicit or explicit form

    Default:True

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Determines whether this object is calculated using an implicit or explicit form

  • seed0The seed for the master random number generator

    Default:0

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:The seed for the master random number generator

  • use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Advanced Parameters