Nodal Damage Index UserObject

Description

UserObject NodalDamageIndexPD computes the value for a AuxVariable by calculating the damage index at each material point as the ratio of total volume of intact bonds to total volume all bonds associated with a material point.

$var element = document.getElementById("moose-equation-88ddf050-dcf6-41cd-8fb5-8fddb736be4f");katex.render(" \\phi \\left( \\mathbf{X}^{\\prime} - \\mathbf{X}, t \\right) = 1 -\\frac{\\int_{\\mathcal{H}_{\\mathbf{X}}} \\mu \\left( \\mathbf{X}^{\\prime} - \\mathbf{X}, t \\right) dV^{\\prime}}{\\int_{\\mathcal{H}_{\\mathbf{X}}} 1 dV^{\\prime}}", element, {displayMode:true,throwOnError:false,macros:{"\\pf":"\\frac{\\partial #1}{\\partial #2}"}});$ where $var element = document.getElementById("moose-equation-9087fab1-fa4d-456a-8f6b-fdee87b6fb38");katex.render("\\mu", element, {displayMode:false,throwOnError:false,macros:{"\\pf":"\\frac{\\partial #1}{\\partial #2}"}});$ is the bond status parameter whose value is computed using AuxKernel BondStatusPD.

Input Parameters

variableName of AuxVariable this userobject is acting on
C++ Type:std::vector
Options:
Description:Name of AuxVariable this userobject is acting on

Required Parameters

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
execute_onINITIAL TIMESTEP_ENDThe 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.
Default:INITIAL TIMESTEP_END
C++ Type:ExecFlagEnum
Options:NONE INITIAL LINEAR NONLINEAR TIMESTEP_END TIMESTEP_BEGIN FINAL CUSTOM
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.

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
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
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/peridynamics/test/tests/failure_tests/2D_stress_failure_NOSPD.i
modules/peridynamics/test/tests/failure_tests/2D_stretch_failure_BPD.i

modules/peridynamics/test/tests/failure_tests/2D_stress_failure_NOSPD.i


[GlobalParams]
  displacements = 'disp_x disp_y'
[]

[Mesh]
  type = PeridynamicsMesh
  horizon_number = 3
  cracks_start = '0.25 0.5 0'
  cracks_end = '0.75 0.5 0'

  [./gmg]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 8
    ny = 8
  [../]
  [./gpd]
    type = MeshGeneratorPD
    input = gmg
    retain_fe_mesh = false
  [../]
[]

[Variables]
  [./disp_x]
  [../]
  [./disp_y]
  [../]
[]

[AuxVariables]
  [./damage]
  [../]
  [./intact_bonds_num]
  [../]
  [./critical_stress]
    family = MONOMIAL
    order = CONSTANT
  [../]
[]

[AuxKernels]
  [./bond_status]
    type = RankTwoBasedFailureCriteriaNOSPD
    variable = bond_status
    rank_two_tensor = stress
    critical_variable = critical_stress
    failure_criterion = VonMisesStress
  [../]
[]

[UserObjects]
  [./damage]
    type = NodalDamageIndexPD
    variable = damage
  [../]
  [./intact_bonds]
    type = NodalNumIntactBondsPD
    variable = intact_bonds_num
  [../]
[]

[ICs]
  [./critical_stretch]
    type = ConstantIC
    variable = critical_stress
    value = 150
  [../]
[]

[BCs]
  [./left_x]
    type = DirichletBC
    variable = disp_x
    boundary = 1003
    value = 0.0
  [../]
  [./top_y]
    type = DirichletBC
    variable = disp_y
    boundary = 1002
    value = 0.0
  [../]
  [./bottom_y]
    type = FunctionDirichletBC
    variable = disp_y
    boundary = 1000
    function = '-0.001*t'
  [../]

  [./rbm_x]
    type = RBMPresetOldValuePD
    variable = disp_x
    boundary = 999
  [../]
  [./rbm_y]
    type = RBMPresetOldValuePD
    variable = disp_y
    boundary = 999
  [../]
[]

[Modules/Peridynamics/Mechanics/Master]
  [./all]
    formulation = NONORDINARY_STATE
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 2e5
    poissons_ratio = 0.33
  [../]
  [./strain]
    type = ComputeSmallStrainNOSPD
  [../]
  [./stress]
    type = ComputeLinearElasticStress
  [../]
[]

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

[Executioner]
  type = Transient
  solve_type = PJFNK
  line_search = none
  start_time = 0
  dt = 0.5
  end_time = 1

  [./Quadrature]
    type = GAUSS_LOBATTO
    order = FIRST
  [../]
[]

[Outputs]
  file_base = 2D_stress_failure_NOSPD
  exodus = true
[]

modules/peridynamics/test/tests/failure_tests/2D_stretch_failure_BPD.i


[GlobalParams]
  displacements = 'disp_x disp_y'
[]

[Mesh]
  type = PeridynamicsMesh
  horizon_number = 3
  cracks_start = '0.25 0.5 0'
  cracks_end = '0.75 0.5 0'

  [./gmg]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 8
    ny = 8
  [../]
  [./gpd]
    type = MeshGeneratorPD
    input = gmg
    retain_fe_mesh = false
  [../]
[]

[Variables]
  [./disp_x]
  [../]
  [./disp_y]
  [../]
[]

[AuxVariables]
  [./damage]
  [../]
  [./intact_bonds_num]
  [../]
  [./critical_stretch]
    family = MONOMIAL
    order = CONSTANT
  [../]
[]

[AuxKernels]
  [./bond_status]
    type = StretchBasedFailureCriterionPD
    critical_variable = critical_stretch
    variable = bond_status
  [../]
[]

[UserObjects]
  [./damage]
    type = NodalDamageIndexPD
    variable = damage
  [../]
  [./intact_bonds]
    type = NodalNumIntactBondsPD
    variable = intact_bonds_num
  [../]
[]

[ICs]
  [./critical_stretch]
    type = ConstantIC
    variable = critical_stretch
    value = 0.001
  [../]
[]

[BCs]
  [./left_x]
    type = DirichletBC
    variable = disp_x
    boundary = 1003
    value = 0.0
  [../]
  [./top_y]
    type = DirichletBC
    variable = disp_y
    boundary = 1002
    value = 0.0
  [../]
  [./bottom_y]
    type = FunctionDirichletBC
    variable = disp_y
    boundary = 1000
    function = '-0.001*t'
  [../]

  [./rbm_x]
    type = RBMPresetOldValuePD
    variable = disp_x
    boundary = 999
  [../]
  [./rbm_y]
    type = RBMPresetOldValuePD
    variable = disp_y
    boundary = 999
  [../]
[]

[Modules/Peridynamics/Mechanics/Master]
  [./all]
    formulation = BOND
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 2e5
    poissons_ratio = 0.33
  [../]

  [./force_density]
    type = ComputeSmallStrainConstantHorizonMaterialBPD
  [../]
[]

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

[Executioner]
  type = Transient
  solve_type = PJFNK
  line_search = none
  start_time = 0
  dt = 0.5
  end_time = 1
[]

[Outputs]
  file_base = 2D_stretch_failure_BPD
  exodus = true
[]

Description
Input Parameters
Input Files

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