ComputeCrackTipEnrichmentSmallStrain

Computes the crack tip enrichment at a point within a small strain formulation.

Description

The displacement field contains both the standard and the enrichment solution. The ComputeCrackTipEnrichmentSmallStrain Material calculates the strains from the total displacement field, including the contributions from both the standard and enrichment solution. This is a drop-in replacement for the standard strain calculators, and is applicable only to small-strain problems.

Input Parameters

crack_front_definitionThe CrackFrontDefinition user object name
C++ Type:UserObjectName
Options:
Description:The CrackFrontDefinition user object name
displacementsThe displacements appropriate for the simulation geometry and coordinate system
C++ Type:std::vector
Options:
Description:The displacements appropriate for the simulation geometry and coordinate system
enrichment_displacementsThe enrichment displacement
C++ Type:std::vector
Options:
Description:The enrichment displacement

Required Parameters

base_nameOptional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases
C++ Type:std::string
Options:
Description:Optional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases
blockThe list of block ids (SubdomainID) that this object will be applied
C++ Type:std::vector
Options:
Description:The list of block ids (SubdomainID) that this object will be applied
boundaryThe list of boundary IDs from the mesh where this boundary condition applies
C++ Type:std::vector
Options:
Description:The list of boundary IDs from the mesh where this boundary condition applies
computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.
Default:True
C++ Type:bool
Options:
Description:When false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.
constant_onNONEWhen ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped
Default:NONE
C++ Type:MooseEnum
Options:NONE ELEMENT SUBDOMAIN
Description:When ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped
eigenstrain_namesList of eigenstrains to be applied in this strain calculation
C++ Type:std::vector
Options:
Description:List of eigenstrains to be applied in this strain calculation
global_strainOptional material property holding a global strain tensor applied to the mesh as a whole
C++ Type:MaterialPropertyName
Options:
Description:Optional material property holding a global strain tensor applied to the mesh as a whole
volumetric_locking_correctionFalseFlag to correct volumetric locking
Default:False
C++ Type:bool
Options:
Description:Flag to correct volumetric locking

Optional Parameters

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

Advanced Parameters

output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)
C++ Type:std::vector
Options:
Description:List of material properties, from this material, to output (outputs must also be defined to an output type)
outputsnone Vector of output names were you would like to restrict the output of variables(s) associated with this object
Default:none
C++ Type:std::vector
Options:
Description:Vector of output names were you would like to restrict the output of variables(s) associated with this object

Outputs Parameters

Input Files

modules/xfem/test/tests/crack_tip_enrichment/edge_crack_2d.i
modules/xfem/test/tests/crack_tip_enrichment/penny_crack_3d.i

modules/xfem/test/tests/crack_tip_enrichment/edge_crack_2d.i

[XFEM]
  qrule = volfrac
  output_cut_plane = true
  use_crack_tip_enrichment = true
  crack_front_definition = crack_tip
  enrichment_displacements = 'enrich1_x enrich2_x enrich3_x enrich4_x enrich1_y enrich2_y enrich3_y enrich4_y'
  displacements = 'disp_x disp_y'
  cut_off_boundary = all
  cut_off_radius = 0.2
[]

[UserObjects]
  [./line_seg_cut_uo]
    type = LineSegmentCutUserObject
    cut_data = '0.0 1.0 0.5 1.0'
    time_start_cut = 0.0
    time_end_cut = 0.0
  [../]
  [./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
  [../]
[]

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 5
    ny = 9
    xmin = 0.0
    xmax = 1.0
    ymin = 0.0
    ymax = 2.0
    elem_type = QUAD4
  []
  [./all_node]
    type = BoundingBoxNodeSetGenerator
    new_boundary = 'all'
    top_right = '1 2 0'
    bottom_left = '0 0 0'
    input = gen
  [../]
  [./right_bottom_node]
    type = ExtraNodesetGenerator
    new_boundary = 'right_bottom_node'
    coord = '1.0 0.0'
    input = all_node
  [../]
  [./right_top_node]
    type = ExtraNodesetGenerator
    new_boundary = 'right_top_node'
    coord = '1.0 2.0'
    input = right_bottom_node
  [../]
[]

[Variables]
  [./disp_x]
    order = FIRST
    family = LAGRANGE
  [../]
  [./disp_y]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
 [./saved_x]
  [../]
  [./saved_y]
  [../]
  [./stress_xx]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_xy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./vonmises]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./TensorMechanics]
    displacements = 'disp_x disp_y'
  [../]
[]

[AuxKernels]
  [./stress_xx]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_xx
    index_i = 0
    index_j = 0
    execute_on = timestep_end
  [../]
  [./stress_yy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_yy
    index_i = 1
    index_j = 1
    execute_on = timestep_end
  [../]
  [./stress_xy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_xy
    index_i = 0
    index_j = 1
    execute_on = timestep_end
  [../]
  [./vonmises]
    type = RankTwoScalarAux
    rank_two_tensor = stress
    variable = vonmises
    scalar_type = vonmisesStress
    execute_on = timestep_end
  [../]
[]

[BCs]
  [./top_y]
    type = Pressure
    variable = disp_y
    boundary = top
    component = 1
    factor = -1
  [../]
  [./bottom_y]
    type = Pressure
    variable = disp_y
    boundary = bottom
    component = 1
    factor = -1
  [../]
  [./fix_y]
    type = DirichletBC
    boundary = right_bottom_node
    variable = disp_y
    value = 0.0
  [../]
  [./fix_x]
    type = DirichletBC
    boundary = right_bottom_node
    variable = disp_x
    value =  0.0
  [../]
  [./fix_x2]
    type = DirichletBC
    boundary = right_top_node
    variable = disp_x
    value =  0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 1e6
    poissons_ratio = 0.3
  [../]
  [./strain]
    type = ComputeCrackTipEnrichmentSmallStrain
    displacements = 'disp_x disp_y'
    crack_front_definition = crack_tip
    enrichment_displacements = 'enrich1_x enrich2_x enrich3_x enrich4_x enrich1_y enrich2_y enrich3_y enrich4_y'
  [../]
  [./stress]
    type = ComputeLinearElasticStress
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_factor_mat_solver_package'
  petsc_options_value = 'lu     superlu_dist'

  line_search = 'none'

  # Since we do not sub-triangularize the tip element,
  # we need to use higher order quadrature rule to improve
  # integration accuracy.
  # Here second = SECOND is for regression test only.
  # However, order = SIXTH is recommended.
  [./Quadrature]
    type = GAUSS
    order = SECOND
  [../]

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

  # controls for linear iterations
  l_max_its = 10
  l_tol = 1e-4

  # controls for nonlinear iterations
  nl_max_its = 100
  nl_rel_tol = 1e-12 #11
  nl_abs_tol = 1e-12 #12

  # time control
  start_time = 0.0
  dt = 1.0
  end_time = 1.0
  dtmin = 1.0
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]


[Outputs]
  file_base = edge_crack_2d_out
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

modules/xfem/test/tests/crack_tip_enrichment/penny_crack_3d.i

[XFEM]
  qrule = volfrac
  output_cut_plane = true
  use_crack_tip_enrichment = true
  crack_front_definition = crack_front
  enrichment_displacements = 'enrich1_x enrich2_x enrich3_x enrich4_x enrich1_y enrich2_y enrich3_y enrich4_y enrich1_z enrich2_z enrich3_z enrich4_z'
  displacements = 'disp_x disp_y disp_z'
  cut_off_boundary = all
  cut_off_radius = 0.3
[]

[UserObjects]
  [./circle_cut_uo]
    type = CircleCutUserObject
    cut_data = '0 0 0
                0.5 0 0
                0 0.5 0'
  [../]
  [./crack_front]
    type = CrackFrontDefinition
    crack_direction_method = CurvedCrackFront
    crack_front_points = '0.500000000000000                   0                   0
                          0.000000000000000   0.500000000000000                   0
                         -0.500000000000000   0.000000000000000                   0
                         -0.000000000000000  -0.500000000000000                   0'
  [../]
[]

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 3
    nx = 9
    ny = 9
    nz = 3
    xmin = -1.0
    xmax = 1.0
    ymin = -1.0
    ymax = 1.0
    zmin = -0.75
    zmax = 0.75
    elem_type = HEX8
  []
  [./all_node]
    type = BoundingBoxNodeSetGenerator
    input = gen
    new_boundary = 'all'
    top_right = '1 1 1'
    bottom_left = '-1 -1 -1'
  [../]
[]

[Variables]
  [./disp_x]
    order = FIRST
    family = LAGRANGE
  [../]
  [./disp_y]
    order = FIRST
    family = LAGRANGE
  [../]
  [./disp_z]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./stress_xx]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./SED]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[AuxKernels]
  [./stress_xx]
  type = RankTwoAux
  rank_two_tensor = stress
  variable = stress_xx
  index_i = 0
  index_j = 0
  execute_on = timestep_end
  [../]
  [./stress_yy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_yy
    index_i = 1
    index_j = 1
    execute_on = timestep_end
  [../]
  [./stress_zz]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_zz
    index_i = 2
    index_j = 2
    execute_on = timestep_end
  [../]
[]

[Kernels]
  [./TensorMechanics]
    displacements = 'disp_x disp_y disp_z'
    use_displaced_mesh = false
    volumetric_locking_correction = false
  [../]
[]

[BCs]
  [./top_z]
    type = Pressure
    variable = disp_z
    boundary = front
    component = 2
    factor = -1
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = back
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = back
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = back
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 1e6
    poissons_ratio = 0.3
  [../]
  [./strain]
    type = ComputeCrackTipEnrichmentSmallStrain
    displacements = 'disp_x disp_y disp_z'
    crack_front_definition = crack_front
    enrichment_displacements = 'enrich1_x enrich2_x enrich3_x enrich4_x enrich1_y enrich2_y enrich3_y enrich4_y enrich1_z enrich2_z enrich3_z enrich4_z'
  [../]
  [./stress]
    type = ComputeLinearElasticStress
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_factor_mat_solver_package'
  petsc_options_value = 'lu     superlu_dist'

  line_search = 'none'

  [./Quadrature]
    type = GAUSS
    order = SECOND
  [../]

  # controls for linear iterations
  l_max_its = 10
  l_tol = 1e-2

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

  # time control
  start_time = 0.0
  dt = 1.0
  end_time = 1.0
[]

[Outputs]
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

Input Parameters
Input Files

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