CrackMeshCut3DUserObject

Creates a UserObject for a mesh cutter in 3D problems

Overview

This class: (1) reads in a mesh describing the crack surface, (2) uses the mesh to do initial cutting of 3D elements, and (3) grows the mesh incrementally based on prescribed growth functions. The code is interfaced with domain integral methods to allow nonplanar crack growth based on empirical propagation direction and speed laws.

Example Input Syntax

[UserObjects]
  [./cut_mesh]
    type = CrackMeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    growth_dir_method = 'function'
    size_control = 0.1
    n_step_growth = 1
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
    function_v = growth_func_v
  [../]
[]

Input Parameters

mesh_fileMesh file for the XFEM geometric cut; currently only the xda type is supported
C++ Type:MeshFileName
Options:
Description:Mesh file for the XFEM geometric cut; currently only the xda type is supported

Required Parameters

blockThe list of blocks (ids or names) that this object will be applied
C++ Type:std::vector<SubdomainName>
Options:
Description:The list of blocks (ids or names) that this object will be applied
crack_front_nodesSet of nodes to define crack front
C++ Type:std::vector<unsigned long>
Options:
Description:Set of nodes to define crack front
execute_onXFEM_MARKThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM, XFEM_MARK.
Default:XFEM_MARK
C++ Type:ExecFlagEnum
Options:NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM, XFEM_MARK
Description:The list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM, XFEM_MARK.
function_vGrowth speed function
C++ Type:FunctionName
Options:
Description:Growth speed function
function_xGrowth function for x direction
C++ Type:FunctionName
Options:
Description:Growth function for x direction
function_yGrowth function for y direction
C++ Type:FunctionName
Options:
Description:Growth function for y direction
function_zGrowth function for z direction
C++ Type:FunctionName
Options:
Description:Growth function for z direction
growth_dir_methodfunctionchoose from function, max_hoop_stress
Default:function
C++ Type:std::string
Options:
Description:choose from function, max_hoop_stress
growth_speed_methodfunctionchoose from function, fatigue
Default:function
C++ Type:std::string
Options:
Description:choose from function, fatigue
heal_alwaysFalseHeal previous cuts at every time step
Default:False
C++ Type:bool
Options:
Description:Heal previous cuts at every time step
n_step_growth0Number of steps for crack growth
Default:0
C++ Type:unsigned int
Options:
Description:Number of steps for crack growth
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
Options:
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.
size_control0Criterion for refining elements while growing the crack
Default:0
C++ Type:double
Options:
Description:Criterion for refining elements while growing the crack

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
Options:
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>
Options:
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Options:
Description:Set the enabled status of the MooseObject.
force_postauxFalseForces the UserObject to be executed in POSTAUX
Default:False
C++ Type:bool
Options:
Description:Forces the UserObject to be executed in POSTAUX
force_preauxFalseForces the UserObject to be executed in PREAUX
Default:False
C++ Type:bool
Options:
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
Options:
Description:Forces the UserObject to be executed in PREIC during initial setup
implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Options:
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
Options:
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
Options:
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

Input Files

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_fatigue.i)
(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_propagation.i)
(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_mhs.i)

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_propagation.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  qrule = volfrac
  output_cut_plane = true
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 2
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = 0.0
  zmax = 0.2
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = CrackMeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    growth_dir_method = 'function'
    size_control = 0.1
    n_step_growth = 1
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
    function_v = growth_func_v
  [../]
[]

[Functions]
  [./growth_func_x]
    type = ParsedFunction
    value = 1
  [../]
  [./growth_func_y]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_z]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_v]
    type = ParsedFunction
    value = 0.15
  [../]
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_y]
    type = ConstantFunction
    value = 10
  [../]
[]


[BCs]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
    block = 0
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
    block = 0
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 3.0
  max_xfem_update = 1
[]

[Outputs]
  file_base = edge_crack_3d_propagation_out
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_fatigue.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  qrule = volfrac
  output_cut_plane = true
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 2
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = 0.0
  zmax = 0.2
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = CrackMeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    growth_dir_method = 'function'
    size_control = 1
    n_step_growth = 1
    growth_speed_method = 'fatigue'
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
    function_v = growth_func_v
    crack_front_nodes = '7 6 5 4'
  [../]
[]

[Functions]
  [./growth_func_x]
    type = ParsedFunction
    value = 1
  [../]
  [./growth_func_y]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_z]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_v]
    type = ParsedFunction
    vars = 'dN'
    vals = 'fatigue'
    value = dN
  [../]
[]

[Postprocessors]
  [./fatigue]
    type = ParisLaw
    max_growth_size = 0.1
    paris_law_c = 1e-13
    paris_law_m = 2.5
  [../]
[]

[DomainIntegral]
  integrals = 'Jintegral InteractionIntegralKI InteractionIntegralKII'
  displacements = 'disp_x disp_y disp_z'
  crack_front_points_provider = cut_mesh
  number_points_from_provider = 4
  crack_direction_method = CurvedCrackFront
  radius_inner = '0.15'
  radius_outer = '0.45'
  poissons_ratio = 0.3
  youngs_modulus = 207000
  block = 0
  incremental = true
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_y]
    type = ConstantFunction
    value = 10
  [../]
[]


[BCs]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
    block = 0
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
    block = 0
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 4.0
  max_xfem_update = 1
[]

[Outputs]
  file_base = edge_crack_3d_fatigue_out
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_propagation.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  qrule = volfrac
  output_cut_plane = true
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 2
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = 0.0
  zmax = 0.2
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = CrackMeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    growth_dir_method = 'function'
    size_control = 0.1
    n_step_growth = 1
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
    function_v = growth_func_v
  [../]
[]

[Functions]
  [./growth_func_x]
    type = ParsedFunction
    value = 1
  [../]
  [./growth_func_y]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_z]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_v]
    type = ParsedFunction
    value = 0.15
  [../]
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_y]
    type = ConstantFunction
    value = 10
  [../]
[]


[BCs]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
    block = 0
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
    block = 0
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 3.0
  max_xfem_update = 1
[]

[Outputs]
  file_base = edge_crack_3d_propagation_out
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_mhs.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  qrule = volfrac
  output_cut_plane = true
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 2
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = 0.0
  zmax = 0.2
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = CrackMeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    growth_dir_method = 'max_hoop_stress'
    size_control = 1
    n_step_growth = 1
    function_v = growth_func_v
    crack_front_nodes = '7 6 5 4'
  [../]
[]

[Functions]
  [./growth_func_v]
    type = ParsedFunction
    value = 0.15
  [../]
[]

[DomainIntegral]
  integrals = 'Jintegral InteractionIntegralKI InteractionIntegralKII'
  displacements = 'disp_x disp_y disp_z'
  crack_front_points_provider = cut_mesh
  number_points_from_provider = 4
  crack_direction_method = CurvedCrackFront
  radius_inner = '0.15'
  radius_outer = '0.45'
  poissons_ratio = 0.3
  youngs_modulus = 207000
  block = 0
  incremental = true
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_x]
    type = ConstantFunction
    value = 100
  [../]
  [./top_trac_y]
    type = ConstantFunction
    value = 0
  [../]
[]


[BCs]
  [./top_x]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_x
    function = top_trac_x
  [../]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
    block = 0
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
    block = 0
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 4.0
  max_xfem_update = 1
[]

[Outputs]
  file_base = edge_crack_3d_mhs_out
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

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Example Input Syntax
Input Parameters
Input Files

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