ComputeHomogenizedLagrangianStrain

Overview

This simple material is part of the Lagrangian kernel homogenization system. It extracts the values of the homogenization strain or deformation gradient from a ScalarVariable and defines the appropriate gradient tensor. The ComputeLagrangianStrain then adds this extra gradient to the deformation gradient calculated from the displacement field. The homogenization system documentation describes how the strain/gradient components are stored in the ScalarVariable.

The TensorMechanics/MasterAction can add this object automatically, which is the recommended way to set up homogenization constraints.

Example Input File Syntax

This example manually specifies the parameters required to initialize the object for a large deformation, 3D example. The important input parameters are macro_gradient, the name of the ScalarVariable, and large_kinematics which determines if the ScalarVariable holds a symmetric small strain tensor (false) or a non-symmetric displacement gradient (large).

[Materials]
  [elastic_tensor_1]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 100000.0
    poissons_ratio = 0.3
    block = '1'
  []
  [elastic_tensor_2]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 120000.0
    poissons_ratio = 0.21
    block = '2'
  []
  [elastic_tensor_3]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 80000.0
    poissons_ratio = 0.4
    block = '3'
  []
  [elastic_tensor_4]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 76000.0
    poissons_ratio = 0.11
    block = '4'
  []
  [compute_stress]
    type = ComputeLagrangianLinearElasticStress
  []
  [compute_strain]
    type = ComputeLagrangianStrain
    homogenization_gradient_names = 'homogenization_gradient'
  []
  [compute_homogenization_gradient]
    type = ComputeHomogenizedLagrangianStrain
  []
[]
(../moose/modules/tensor_mechanics/test/tests/lagrangian/cartesian/total/homogenization/large-tests/3d.i)

Input Parameters

  • homogenization_constraintThe UserObject for defining the homogenization constraint

    C++ Type:UserObjectName

    Controllable:No

    Description:The UserObject for defining the homogenization constraint

  • macro_gradientScalar field defining the macro gradient

    C++ Type:std::vector<VariableName>

    Controllable:No

    Description:Scalar field defining the macro gradient

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.

  • 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 computeQpProperties() 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

    Controllable:No

    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 computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

  • 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.

  • homogenization_gradient_namehomogenization_gradientName of the constant gradient field

    Default:homogenization_gradient

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:Name of the constant gradient field

  • 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

  • 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

  • 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