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<<<{"href": "../../syntax/UserObjects/index.html"}>>>]
  [./cut_mesh]
    type = CrackMeshCut3DUserObject<<<{"description": "Creates a UserObject for a mesh cutter in 3D problems", "href": "CrackMeshCut3DUserObject.html"}>>>
    mesh_file<<<{"description": "Mesh file for the XFEM geometric cut; currently only the xda type is supported"}>>> = mesh_edge_crack.xda
    growth_dir_method<<<{"description": "choose from FUNCTION, MAX_HOOP_STRESS"}>>> = FUNCTION
    size_control<<<{"description": "Criterion for refining elements while growing the crack"}>>> = 0.1
    n_step_growth<<<{"description": "Number of steps for crack growth"}>>> = 1
    growth_direction_x<<<{"description": "Function defining x-component of crack growth direction"}>>> = growth_func_x
    growth_direction_y<<<{"description": "Function defining y-component of crack growth direction"}>>> = growth_func_y
    growth_direction_z<<<{"description": "Function defining z-component of crack growth direction"}>>> = growth_func_z
    growth_rate<<<{"description": "Function defining crack growth rate"}>>> = growth_func_v
  [../]
[]

Input Parameters

mesh_fileMesh file for the XFEM geometric cut; currently only the xda type is supported
C++ Type:MeshFileName
Controllable:No
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>
Controllable:No
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>
Controllable:No
Description:Set of nodes to define crack front
growth_dir_methodFUNCTIONchoose from FUNCTION, MAX_HOOP_STRESS
Default:FUNCTION
C++ Type:MooseEnum
Options:MAX_HOOP_STRESS, FUNCTION
Controllable:No
Description:choose from FUNCTION, MAX_HOOP_STRESS
growth_direction_xFunction defining x-component of crack growth direction
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Function defining x-component of crack growth direction
growth_direction_yFunction defining y-component of crack growth direction
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Function defining y-component of crack growth direction
growth_direction_zFunction defining z-component of crack growth direction
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Function defining z-component of crack growth direction
growth_rateFunction defining crack growth rate
C++ Type:FunctionName
Unit:(no unit assumed)
Controllable:No
Description:Function defining crack growth rate
growth_rate_methodFUNCTIONchoose from FUNCTION, FATIGUE
Default:FUNCTION
C++ Type:MooseEnum
Options:FATIGUE, FUNCTION
Controllable:No
Description:choose from FUNCTION, FATIGUE
heal_alwaysFalseHeal previous cuts at every time step
Default:False
C++ Type:bool
Controllable:No
Description:Heal previous cuts at every time step
n_step_growth0Number of steps for crack growth
Default:0
C++ Type:unsigned int
Controllable:No
Description:Number of steps for crack growth
size_control0Criterion for refining elements while growing the crack
Default:0
C++ Type:double
Unit:(no unit assumed)
Controllable:No
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
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).
execute_onXFEM_MARKThe 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:XFEM_MARK
C++ Type:ExecFlagEnum
Options:XFEM_MARK, NONE, INITIAL, LINEAR, LINEAR_CONVERGENCE, NONLINEAR, NONLINEAR_CONVERGENCE, POSTCHECK, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, MULTIAPP_FIXED_POINT_CONVERGENCE, 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.
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
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
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
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
Controllable:No
Description:Forces the UserObject to be executed in PREIC during initial setup

Execution Scheduling Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
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
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
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
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
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

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.
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
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.

Material Property Retrieval Parameters

(moose/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
    growth_direction_x = growth_func_x
    growth_direction_y = growth_func_y
    growth_direction_z = growth_func_z
    growth_rate = growth_func_v
  [../]
[]

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

[Physics/SolidMechanics/QuasiStatic]
  [./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
  [../]
[]

Overview
Example Input Syntax
Input Parameters

Usage

Development

Demonstration