Crack Front Definition

Used to describe geometric characteristics of the crack front for fracture integral calculations

Description

This object is used in the computation of fracture domain integrals. It is used to store information about the location of the crack front, and provides functions used by other objects involved in fracture integral calculation. It is not necessary to define this block in the input file, as it can be set up using the DomainIntegralAction.

Example Input File Syntax

[./crack_tip]
  type = CrackFrontDefinition
  crack_direction_method = CrackDirectionVector
  crack_front_points = '0.5 1.0 0'
  crack_direction_vector = '1 0 0'
  2d = true
  axis_2d = 2
[../]
(moose/modules/xfem/test/tests/crack_tip_enrichment/edge_crack_2d.i)

Input Parameters

  • crack_direction_methodMethod to determine direction of crack propagation. Choices are: CrackDirectionVector CrackMouth CurvedCrackFront

    C++ Type:MooseEnum

    Unit:(no unit assumed)

    Options:CrackDirectionVector, CrackMouth, CurvedCrackFront

    Controllable:No

    Description:Method to determine direction of crack propagation. Choices are: CrackDirectionVector CrackMouth CurvedCrackFront

Required Parameters

  • 2dFalseTreat body as two-dimensional

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Treat body as two-dimensional

  • axis_2d2Out of plane axis for models treated as two-dimensional (0=x, 1=y, 2=z)

    Default:2

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:Out of plane axis for models treated as two-dimensional (0=x, 1=y, 2=z)

  • boundaryThe list of boundaries (ids or names) from the mesh where this object applies

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

    Unit:(no unit assumed)

    Controllable:No

    Description:The list of boundaries (ids or names) from the mesh where this object applies

  • closed_loopFalseSet of points forms forms a closed loop

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Set of points forms forms a closed loop

  • crack_direction_vectorDirection of crack propagation

    C++ Type:libMesh::VectorValue<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Direction of crack propagation

  • crack_direction_vector_end_1Direction of crack propagation for the node at end 1 of the crack

    C++ Type:libMesh::VectorValue<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Direction of crack propagation for the node at end 1 of the crack

  • crack_direction_vector_end_2Direction of crack propagation for the node at end 2 of the crack

    C++ Type:libMesh::VectorValue<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Direction of crack propagation for the node at end 2 of the crack

  • crack_end_direction_methodNoSpecialTreatmentMethod to determine direction of crack propagation at ends of crack. Choices are: NoSpecialTreatment CrackDirectionVector CrackTangentVector

    Default:NoSpecialTreatment

    C++ Type:MooseEnum

    Unit:(no unit assumed)

    Options:NoSpecialTreatment, CrackDirectionVector, CrackTangentVector

    Controllable:No

    Description:Method to determine direction of crack propagation at ends of crack. Choices are: NoSpecialTreatment CrackDirectionVector CrackTangentVector

  • crack_front_pointsSet of points to define crack front

    C++ Type:std::vector<libMesh::Point>

    Unit:(no unit assumed)

    Controllable:No

    Description:Set of points to define crack front

  • crack_front_points_providerThe UserObject provides the crack front points from XFEM GeometricCutObject

    C++ Type:UserObjectName

    Unit:(no unit assumed)

    Controllable:No

    Description:The UserObject provides the crack front points from XFEM GeometricCutObject

  • crack_mouth_boundaryBoundaries whose average coordinate defines the crack mouth

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

    Unit:(no unit assumed)

    Controllable:No

    Description:Boundaries whose average coordinate defines the crack mouth

  • crack_tangent_vector_end_1Direction of crack tangent for the node at end 1 of the crack

    C++ Type:libMesh::VectorValue<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Direction of crack tangent for the node at end 1 of the crack

  • crack_tangent_vector_end_2Direction of crack tangent for the node at end 2 of the crack

    C++ Type:libMesh::VectorValue<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Direction of crack tangent for the node at end 2 of the crack

  • disp_xVariable containing the x displacement

    C++ Type:VariableName

    Unit:(no unit assumed)

    Controllable:No

    Description:Variable containing the x displacement

  • disp_yVariable containing the y displacement

    C++ Type:VariableName

    Unit:(no unit assumed)

    Controllable:No

    Description:Variable containing the y displacement

  • disp_zVariable containing the z displacement

    C++ Type:VariableName

    Unit:(no unit assumed)

    Controllable:No

    Description:Variable containing the z displacement

  • execute_onTIMESTEP_ENDThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.

    Default:TIMESTEP_END

    C++ Type:ExecFlagEnum

    Unit:(no unit assumed)

    Options:NONE, INITIAL, LINEAR, NONLINEAR_CONVERGENCE, NONLINEAR, POSTCHECK, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM

    Controllable:No

    Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.

  • first_ringThe number of rings of nodes to generate

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:The number of rings of nodes to generate

  • intersecting_boundaryBoundaries intersected by ends of crack

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

    Unit:(no unit assumed)

    Controllable:No

    Description:Boundaries intersected by ends of crack

  • j_integral_radius_innerRadius for J-Integral calculation

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

    Unit:(no unit assumed)

    Controllable:No

    Description:Radius for J-Integral calculation

  • j_integral_radius_outerRadius for J-Integral calculation

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

    Unit:(no unit assumed)

    Controllable:No

    Description:Radius for J-Integral calculation

  • last_ringThe number of rings of nodes to generate

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:The number of rings of nodes to generate

  • nringsThe number of rings of nodes to generate

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:The number of rings of nodes to generate

  • number_points_from_providerThe number of crack front points, only needed if crack_front_points_provider is used.

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:The number of crack front points, only needed if crack_front_points_provider is used.

  • prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.

  • q_function_ringsFalseGenerate rings of nodes for q-function

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Generate rings of nodes for q-function

  • q_function_typeGeometryThe method used to define the integration domain. Options are: Geometry Topology

    Default:Geometry

    C++ Type:MooseEnum

    Unit:(no unit assumed)

    Options:Geometry, Topology

    Controllable:No

    Description:The method used to define the integration domain. Options are: Geometry Topology

  • symmetry_planeAccount for a symmetry plane passing through the plane of the crack, normal to the specified axis (0=x, 1=y, 2=z)

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:Account for a symmetry plane passing through the plane of the crack, normal to the specified axis (0=x, 1=y, 2=z)

  • t_stressFalseCalculate T-stress

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Calculate T-stress

  • use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

Optional Parameters

  • allow_duplicate_execution_on_initialFalseIn the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:In the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).

  • 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.

  • execution_order_group0Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.

    Default:0

    C++ Type:int

    Unit:(no unit assumed)

    Controllable:No

    Description:Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.

  • force_postauxFalseForces the UserObject to be executed in POSTAUX

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Forces the UserObject to be executed in POSTAUX

  • force_preauxFalseForces the UserObject to be executed in PREAUX

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Forces the UserObject to be executed in PREAUX

  • force_preicFalseForces the UserObject to be executed in PREIC during initial setup

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:Forces the UserObject to be executed in PREIC during initial setup

  • 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