PureElasticTractionSeparation

Pure elastic traction separation law.

Description

This material implements a pure elastic traction separation law defined by $var element = document.getElementById("moose-equation-62152bd0-0f99-4a40-a1c9-50f7cd59221a");katex.render("T =K \\llbracket u \\rrbracket", element, {displayMode:true,throwOnError:false});$ where $var element = document.getElementById("moose-equation-3570bfe5-5cc5-4560-b0ce-4e235c20b474");katex.render("K", element, {displayMode:false,throwOnError:false});$ is a diagonal stiffness matrix. The user only need to define the normal and tangent stiffness. This model can be used for 1D, 2D and 3D problems.

Example Input File Syntax

[./czm_mat]
  type = PureElasticTractionSeparation
  boundary = 'interface'
  normal_stiffness = 10000
  tangent_stiffness = 7000
[../]

Input Parameters

displacementsThe string of displacements suitable for the problem statement
C++ Type:std::vector<VariableName>
Controllable:No
Description:The string of displacements suitable for the problem statement
normal_stiffnessThe value of K in the normal direction
C++ Type:double
Controllable:No
Description:The value of K in the normal direction
tangent_stiffnessThe value of K in the tangent direction
C++ Type:double
Controllable:No
Description:The value of K in the tangent direction

Required Parameters

base_nameMaterial property base name
C++ Type:std::string
Controllable:No
Description:Material property base name
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
boundaryThe list of boundaries (ids or names) from the mesh where this object applies
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The list of boundaries (ids or names) from the mesh where this object 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
Controllable:No
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.
declare_suffixAn optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Controllable:No
Description:An optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.
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
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.

Optional 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

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<std::string>
Controllable:No
Description:List of material properties, from this material, to output (outputs must also be defined to an output type)
outputsnone Vector of output names where you would like to restrict the output of variables(s) associated with this object
Default:none
C++ Type:std::vector<OutputName>
Controllable:No
Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object

Outputs Parameters

(moose/modules/tensor_mechanics/test/tests/cohesive_zone_model/stretch_rotate_large_deformation.i)

#
# Stretch + rotation test
#
# This test is designed to compute a uniaxial stress and then follow it as the mesh is rotated .
#
# The mesh is composed of two, single-elemnt blocks

[Mesh]
  [./msh]
  type = GeneratedMeshGenerator
  dim = 3
  nx = 1
  ny = 1
  nz = 2
  xmin = -0.5
  xmax = 0.5
  ymin = -0.5
  ymax = 0.5
  zmin = -1
  zmax = 1
  []
  [./new_block]
    type = SubdomainBoundingBoxGenerator
    input = msh
    block_id = 1
    bottom_left = '-0.5 -0.5 0'
    top_right = '0.5 0.5 0.5'
  []
  [./split]
    type = BreakMeshByBlockGenerator
    input = new_block
  []
  [add_side_sets]
    input = split
    type = SideSetsFromNormalsGenerator
    normals = '0 -1  0
               0  1  0
               -1 0  0
               1  0  0
               0  0 -1
               0  0  1'
    fixed_normal = true
    new_boundary = 'y0 y1 x0 x1 z0 z1'
  []
[]

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

[Functions]
  [./stretch]
    type = PiecewiseLinear
    x = '0 1'
    y = '0 300'
  [../]
[]

[BCs]
  [./fix_x]
    type = DirichletBC
    preset = true
    value = 0.0
    boundary = x0
    variable = disp_x
  [../]
  [./fix_y]
    type = DirichletBC
    preset = true
    value = 0.0
    boundary = y0
    variable = disp_y
  [../]
  [./fix_z]
    type = DirichletBC
    preset = true
    value = 0.0
    boundary = z0
    variable = disp_z
  [../]
  [./back_z]
    type = FunctionNeumannBC
    boundary = z1
    variable = disp_z
    use_displaced_mesh = false
    function = stretch
  [../]

  [./rotate_x]
    type = DisplacementAboutAxis
    boundary = 'x0 y0 z0 z1'
    function = '90.'
    angle_units = degrees
    axis_origin = '0. 0. 0.'
    axis_direction = '0. 1. 0.'
    component = 0
    variable = disp_x
    angular_velocity = true
  [../]
  [./rotate_y]
    type = DisplacementAboutAxis
    boundary = 'x0 y0 z0 z1'
    function = '90.'
    angle_units = degrees
    axis_origin = '0. 0. 0.'
    axis_direction = '0. 1. 0.'
    component = 1
    variable = disp_y
    angular_velocity = true
  [../]
  [./rotate_z]
    type = DisplacementAboutAxis
    boundary = 'x0 y0 z0 z1'
    function = '90.'
    angle_units = degrees
    axis_origin = '0. 0. 0.'
    axis_direction = '0. 1. 0.'
    component = 2
    variable = disp_z
    angular_velocity = true
  [../]
[]



[Modules/TensorMechanics/CohesiveZoneMaster]
  [./czm_ik]
    boundary = 'interface'
    strain = FINITE
    generate_output='traction_x traction_y traction_z jump_x jump_y jump_z normal_traction tangent_traction normal_jump tangent_jump pk1_traction_x pk1_traction_y pk1_traction_z'
  [../]
[]

[Controls]
  [./c1]
    type = TimePeriod
    enable_objects = 'BCs::fix_x BCs::fix_y BCs::fix_z BCs::back_z'
    disable_objects = 'BCs::rotate_x BCs::rotate_y BCs::rotate_z'
    start_time = '0'
    end_time = '1'
  [../]
[]

[Modules]
  [./TensorMechanics]
    [./Master]
      [./all]
        strain = FINITE
        add_variables = true
        use_finite_deform_jacobian = true
        use_automatic_differentiation = true
        generate_output = 'stress_xx stress_yy stress_zz stress_xy stress_yz stress_xz'
      [../]
    [../]
  [../]
[]


[Materials]
  [./stress]
    type = ADComputeFiniteStrainElasticStress
  [../]
  [./elasticity_tensor]
    type = ADComputeIsotropicElasticityTensor
    youngs_modulus = 1e3
    poissons_ratio = 0.3
  [../]
  [./czm_mat]
    type = PureElasticTractionSeparation
    boundary = 'interface'
    normal_stiffness = 10000
    tangent_stiffness = 7000
  [../]
[]

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

[Executioner]
  # Executioner
  type = Transient
  solve_type = 'NEWTON'
  line_search = none
  petsc_options_iname = '-pc_type '
  petsc_options_value = 'lu'
  nl_rel_tol = 1e-30
  nl_abs_tol = 1e-10
  l_max_its = 20
  start_time = 0.0
  dt = 0.1
  end_time = 2
[]

[Outputs]
  exodus = true
  csv =true
[]