Rank Two Scalar Aux

Compute a scalar property of a RankTwoTensor

Description

This AuxKernal uses a set of functions to compute scalar quantities such as invariants and components in specified directions from rank-2 tensors such as stress or strain. See RankTwoScalarTools for further information.

Example Input File Syntax

[./vonmises]
  type = RankTwoScalarAux
  rank_two_tensor = stress
  variable = vonmises
  scalar_type = VonMisesStress
  execute_on = timestep_end
[../]

An AuxVariable is required to store the AuxKernel information. Note that the name of the AuxVariable is used as the argument for the variable input parameter in the RankTwoScalarAux block.

[./vonmises]
  order = CONSTANT
  family = MONOMIAL
[../]

As with the RankTwoAux AuxKernel, RankTwoScalarAux requires the inclusion of an AuxVariable block for each AuxKernel block.

AuxVariable Order

note:Elemental vs Nodal Visualization of Quadrature Field Values

Results will have different quality based on the AuxVariable:

Elemental Constant Monomial Using an AuxVariable with family = MONOMIAL and order = CONSTANT will give a constant value of the AuxVariable for the entire element, which is computed by taking a volume-weighted average of the integration point quantities. This is the default option using TensorMechanics Action and requires the least computational cost.
Elemental Higher-order Monomial Using an AuxVariable with family = MONOMIAL and order = FIRST or higher will result in fields that vary linearly (or with higher order) within each element. Because the Exodus mesh format does not support higher-order elemental variables, these AuxVariables are output by libMesh as nodal variables for visualization purposes. Using higher order monomial variables in this way can produce smoother visualizations of results for a properly converged simulation.
Nodal Lagrange Using an AuxVariable with family = LAGRANGE will result in a smooth nodal field of the material property, constructed using nodal patch recovery. patch_polynomial_order is set to equal the order of the AuxVariable by default. Use this option for the best (smoothest, most accurate) results, but there is some additional computational cost. Furthermore, this method is suitable only for serial simulations at present.

Input Parameters

rank_two_tensorThe rank two material tensor name
C++ Type:MaterialPropertyName
Controllable:No
Description:The rank two material tensor name
variableThe name of the variable that this object applies to
C++ Type:AuxVariableName
Controllable:No
Description:The name of the variable that this object applies to

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
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
check_boundary_restrictedTrueWhether to check for multiple element sides on the boundary in the case of a boundary restricted, element aux variable. Setting this to false will allow contribution to a single element's elemental value(s) from multiple boundary sides on the same element (example: when the restricted boundary exists on two or more sides of an element, such as at a corner of a mesh
Default:True
C++ Type:bool
Controllable:No
Description:Whether to check for multiple element sides on the boundary in the case of a boundary restricted, element aux variable. Setting this to false will allow contribution to a single element's elemental value(s) from multiple boundary sides on the same element (example: when the restricted boundary exists on two or more sides of an element, such as at a corner of a mesh
direction0 0 1Direction vector
Default:0 0 1
C++ Type:libMesh::Point
Controllable:No
Description:Direction vector
execute_onLINEAR 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, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS, PRE_DISPLACE.
Default:LINEAR TIMESTEP_END
C++ Type:ExecFlagEnum
Options:NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS, PRE_DISPLACE
Controllable:No
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, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS, PRE_DISPLACE.
point10 0 0Start point for axis used to calculate some cylindrical material tensor quantities
Default:0 0 0
C++ Type:libMesh::Point
Controllable:No
Description:Start point for axis used to calculate some cylindrical material tensor quantities
point20 1 0End point for axis used to calculate some material tensor quantities
Default:0 1 0
C++ Type:libMesh::Point
Controllable:No
Description:End point for axis used to calculate some material tensor quantities
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.
scalar_typeType of scalar output
C++ Type:MooseEnum
Options:VonMisesStress, EffectiveStrain, Hydrostatic, L2norm, MaxPrincipal, MidPrincipal, MinPrincipal, VolumetricStrain, FirstInvariant, SecondInvariant, ThirdInvariant, AxialStress, HoopStress, RadialStress, TriaxialityStress, Direction, MaxShear, StressIntensity
Controllable:No
Description:Type of scalar output

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.
patch_polynomial_orderPolynomial order used in least squares fitting of material property over the local patch of elements connected to a given node
C++ Type:MooseEnum
Options:CONSTANT, FIRST, SECOND, THIRD, FOURTH
Controllable:No
Description:Polynomial order used in least squares fitting of material property over the local patch of elements connected to a given node
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
selected_qpEvaluate the tensor at this quadpoint. This option only needs to be used if you are interested in a particular quadpoint in each element: otherwise do not include this parameter in your input file
C++ Type:unsigned int
Controllable:No
Description:Evaluate the tensor at this quadpoint. This option only needs to be used if you are interested in a particular quadpoint in each element: otherwise do not include this parameter in your input file
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

References

No citations exist within this document.

(../moose/modules/tensor_mechanics/test/tests/material_limit_time_step/elas_plas/nafems_nl1_lim.i)

#
# Tests material model IsotropicPlasticity with material based time stepper
# Boundary conditions from NAFEMS test NL1
#
[GlobalParams]
  order = FIRST
  family = LAGRANGE
  volumetric_locking_correction = true
  displacements = 'disp_x disp_y'
[]

[Mesh]#Comment
  file = one_elem2.e
[] # Mesh

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

[AuxVariables]
  [./stress_xx]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_xy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./vonmises]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./elastic_strain_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./plastic_strain_eff]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./tot_strain_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
[] # AuxVariables

[Kernels]
  [./TensorMechanics]
    use_displaced_mesh = true
  [../]
[]

[AuxKernels]
  [./stress_xx]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_xx
    index_i = 0
    index_j = 0
  [../]
  [./stress_yy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_yy
    index_i = 1
    index_j = 1
  [../]
  [./stress_zz]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_zz
    index_i = 2
    index_j = 2
  [../]
  [./stress_xy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_xy
    index_i = 0
    index_j = 1
  [../]
  [./vonmises]
    type = RankTwoScalarAux
    rank_two_tensor = stress
    variable = vonmises
    scalar_type = VonMisesStress
    execute_on = timestep_end
  [../]
  [./elastic_strain_yy]
    type = RankTwoAux
    rank_two_tensor = elastic_strain
    variable = elastic_strain_yy
    index_i = 1
    index_j = 1
  [../]
  [./plastic_strain_eff]
    type = MaterialRealAux
    property = effective_plastic_strain
    variable = plastic_strain_eff
  [../]
  [./tot_strain_yy]
    type = RankTwoAux
    rank_two_tensor = total_strain
    variable = tot_strain_yy
    index_i = 1
    index_j = 1
  [../]
[] # AuxKernels

[Functions]
  [./appl_dispx]
    type = PiecewiseLinear
    x = '0   1.0   2.0   3.0  4.0   5.0  6.0  7.0  8.0'
    y = '0.0 0.25e-4 0.50e-4 0.50e-4 0.50e-4 0.25e-4 0.0 0.0 0.0'
  [../]
  [./appl_dispy]
    type = PiecewiseLinear
    x = '0   1.0   2.0   3.0  4.0   5.0  6.0  7.0  8.0'
    y = '0.0 0.0  0.0 0.25e-4 0.50e-4 0.50e-4 0.50e-4  0.25e-4 0.0 '
  [../]
[]

[BCs]
  [./side_x]
    type = DirichletBC
    variable = disp_x
    boundary = 101
    value = 0.0
  [../]
  [./origin_x]
    type = DirichletBC
    variable = disp_x
    boundary = 103
    value = 0.0
  [../]
  [./bot_y]
    type = DirichletBC
    variable = disp_y
    boundary = 102
    value = 0.0
  [../]
  [./origin_y]
    type = DirichletBC
    variable = disp_y
    boundary = 103
    value = 0.0
  [../]
  [./top_y]
    type = FunctionDirichletBC
    variable = disp_y
    boundary = 1
    function = appl_dispy
  [../]
  [./right_x]
    type = FunctionDirichletBC
    variable = disp_x
    boundary = 2
    function = appl_dispx
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    block = 1
    youngs_modulus = 250e9
    poissons_ratio = 0.25
  [../]
  [./strain]
    type = ComputePlaneFiniteStrain
    block = 1
  [../]
  [./stress]
    type = ComputeMultipleInelasticStress
    inelastic_models = 'isoplas'
    block = 1
  [../]
  [./isoplas]
    type = IsotropicPlasticityStressUpdate
    yield_stress = 5e6
    hardening_constant = 0.0
    relative_tolerance = 1e-20
    absolute_tolerance = 1e-8
    max_inelastic_increment = 0.000001
  [../]
[]

[Executioner]
  type = Transient
  solve_type = 'PJFNK'

  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-12
  l_tol = 1e-4
  l_max_its = 100
  nl_max_its = 20

  [./TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.1
    time_t = '1.0  2.0  3.0  4.0  5.0  6.0  7.0  8.0'
    time_dt = '0.1 0.1  0.1  0.1  0.1  0.1  0.1  0.1'
    optimal_iterations = 30
    iteration_window = 9
    growth_factor = 2.0
    cutback_factor = 0.5
    timestep_limiting_postprocessor = matl_ts_min
  [../]

  start_time = 0.0
  num_steps = 1000
  end_time = 8.0
[] # Executioner

[Postprocessors]
  [./matl_ts_min]
    type = MaterialTimeStepPostprocessor
  [../]
  [./stress_xx]
    type = ElementAverageValue
    variable = stress_xx
  [../]
  [./stress_yy]
    type = ElementAverageValue
    variable = stress_yy
  [../]
  [./stress_zz]
    type = ElementAverageValue
    variable = stress_zz
  [../]
  [./vonmises]
    type = ElementAverageValue
    variable = vonmises
  [../]
  [./el_strain_yy]
    type = ElementAverageValue
    variable = elastic_strain_yy
  [../]
  [./plas_strain_eff]
    type = ElementAverageValue
    variable = plastic_strain_eff
  [../]
  [./tot_strain_yy]
    type = ElementAverageValue
    variable = tot_strain_yy
  [../]
  [./disp_x1]
    type = NodalVariableValue
    nodeid = 0
    variable = disp_x
  [../]
  [./disp_x4]
    type = NodalVariableValue
    nodeid = 3
    variable = disp_x
  [../]
  [./disp_y1]
    type = NodalVariableValue
    nodeid = 0
    variable = disp_y
  [../]
  [./disp_y4]
    type = NodalVariableValue
    nodeid = 3
    variable = disp_y
  [../]
  [./_dt]
    type = TimestepSize
  [../]
[]

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

(../moose/modules/tensor_mechanics/test/tests/material_limit_time_step/elas_plas/nafems_nl1_lim.i)

#
# Tests material model IsotropicPlasticity with material based time stepper
# Boundary conditions from NAFEMS test NL1
#
[GlobalParams]
  order = FIRST
  family = LAGRANGE
  volumetric_locking_correction = true
  displacements = 'disp_x disp_y'
[]

[Mesh]#Comment
  file = one_elem2.e
[] # Mesh

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

[AuxVariables]
  [./stress_xx]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./stress_xy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./vonmises]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./elastic_strain_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./plastic_strain_eff]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./tot_strain_yy]
    order = CONSTANT
    family = MONOMIAL
  [../]
[] # AuxVariables

[Kernels]
  [./TensorMechanics]
    use_displaced_mesh = true
  [../]
[]

[AuxKernels]
  [./stress_xx]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_xx
    index_i = 0
    index_j = 0
  [../]
  [./stress_yy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_yy
    index_i = 1
    index_j = 1
  [../]
  [./stress_zz]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_zz
    index_i = 2
    index_j = 2
  [../]
  [./stress_xy]
    type = RankTwoAux
    rank_two_tensor = stress
    variable = stress_xy
    index_i = 0
    index_j = 1
  [../]
  [./vonmises]
    type = RankTwoScalarAux
    rank_two_tensor = stress
    variable = vonmises
    scalar_type = VonMisesStress
    execute_on = timestep_end
  [../]
  [./elastic_strain_yy]
    type = RankTwoAux
    rank_two_tensor = elastic_strain
    variable = elastic_strain_yy
    index_i = 1
    index_j = 1
  [../]
  [./plastic_strain_eff]
    type = MaterialRealAux
    property = effective_plastic_strain
    variable = plastic_strain_eff
  [../]
  [./tot_strain_yy]
    type = RankTwoAux
    rank_two_tensor = total_strain
    variable = tot_strain_yy
    index_i = 1
    index_j = 1
  [../]
[] # AuxKernels

[Functions]
  [./appl_dispx]
    type = PiecewiseLinear
    x = '0   1.0   2.0   3.0  4.0   5.0  6.0  7.0  8.0'
    y = '0.0 0.25e-4 0.50e-4 0.50e-4 0.50e-4 0.25e-4 0.0 0.0 0.0'
  [../]
  [./appl_dispy]
    type = PiecewiseLinear
    x = '0   1.0   2.0   3.0  4.0   5.0  6.0  7.0  8.0'
    y = '0.0 0.0  0.0 0.25e-4 0.50e-4 0.50e-4 0.50e-4  0.25e-4 0.0 '
  [../]
[]

[BCs]
  [./side_x]
    type = DirichletBC
    variable = disp_x
    boundary = 101
    value = 0.0
  [../]
  [./origin_x]
    type = DirichletBC
    variable = disp_x
    boundary = 103
    value = 0.0
  [../]
  [./bot_y]
    type = DirichletBC
    variable = disp_y
    boundary = 102
    value = 0.0
  [../]
  [./origin_y]
    type = DirichletBC
    variable = disp_y
    boundary = 103
    value = 0.0
  [../]
  [./top_y]
    type = FunctionDirichletBC
    variable = disp_y
    boundary = 1
    function = appl_dispy
  [../]
  [./right_x]
    type = FunctionDirichletBC
    variable = disp_x
    boundary = 2
    function = appl_dispx
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    block = 1
    youngs_modulus = 250e9
    poissons_ratio = 0.25
  [../]
  [./strain]
    type = ComputePlaneFiniteStrain
    block = 1
  [../]
  [./stress]
    type = ComputeMultipleInelasticStress
    inelastic_models = 'isoplas'
    block = 1
  [../]
  [./isoplas]
    type = IsotropicPlasticityStressUpdate
    yield_stress = 5e6
    hardening_constant = 0.0
    relative_tolerance = 1e-20
    absolute_tolerance = 1e-8
    max_inelastic_increment = 0.000001
  [../]
[]

[Executioner]
  type = Transient
  solve_type = 'PJFNK'

  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-12
  l_tol = 1e-4
  l_max_its = 100
  nl_max_its = 20

  [./TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.1
    time_t = '1.0  2.0  3.0  4.0  5.0  6.0  7.0  8.0'
    time_dt = '0.1 0.1  0.1  0.1  0.1  0.1  0.1  0.1'
    optimal_iterations = 30
    iteration_window = 9
    growth_factor = 2.0
    cutback_factor = 0.5
    timestep_limiting_postprocessor = matl_ts_min
  [../]

  start_time = 0.0
  num_steps = 1000
  end_time = 8.0
[] # Executioner

[Postprocessors]
  [./matl_ts_min]
    type = MaterialTimeStepPostprocessor
  [../]
  [./stress_xx]
    type = ElementAverageValue
    variable = stress_xx
  [../]
  [./stress_yy]
    type = ElementAverageValue
    variable = stress_yy
  [../]
  [./stress_zz]
    type = ElementAverageValue
    variable = stress_zz
  [../]
  [./vonmises]
    type = ElementAverageValue
    variable = vonmises
  [../]
  [./el_strain_yy]
    type = ElementAverageValue
    variable = elastic_strain_yy
  [../]
  [./plas_strain_eff]
    type = ElementAverageValue
    variable = plastic_strain_eff
  [../]
  [./tot_strain_yy]
    type = ElementAverageValue
    variable = tot_strain_yy
  [../]
  [./disp_x1]
    type = NodalVariableValue
    nodeid = 0
    variable = disp_x
  [../]
  [./disp_x4]
    type = NodalVariableValue
    nodeid = 3
    variable = disp_x
  [../]
  [./disp_y1]
    type = NodalVariableValue
    nodeid = 0
    variable = disp_y
  [../]
  [./disp_y4]
    type = NodalVariableValue
    nodeid = 3
    variable = disp_y
  [../]
  [./_dt]
    type = TimestepSize
  [../]
[]

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