Compute Variable Base EigenStrain

Computes Eigenstrain based on material property tensor base

Description

The material ComputeVariableBaseEigenStrain calculates a Rank-2 tensor eigenstrain as a function of a Rank-2 tensor base and a scalar material property. (1) where is the calculated eigenstrain, is a scalar material property, is the tensor selected by the user as the base of the eigenstrain, and is the offset, or constant initial, eigenstrain tensor. The material property is used to introduce dependence of the eigenstrain on the user-specified variable.

Example Input File

[./eigenstrain]
  type = ComputeVariableBaseEigenStrain
  base_tensor_property_name = aniso_tensor
  prefactor = eigenstrain_prefactor
  eigenstrain_name = eigenstrain
[../]
(moose/modules/combined/test/tests/DiffuseCreep/variable_base_eigen_strain.i)

where the argument for the base_tensor_property_name parameter in the eigenstrain is the same as the property parameter gb_tensor_prop_name argument as shown

[./aniso_tensor]
  type = GBDependentAnisotropicTensor
  gb = gb
  bulk_parameter = 0.1
  gb_parameter = 1
  gb_normal_tensor_name = gb_normal
  gb_tensor_prop_name = aniso_tensor
[../]
(moose/modules/combined/test/tests/DiffuseCreep/variable_base_eigen_strain.i)

and the argument for the prefactor parameter in the eigenstrain material matches the function name (f_name parameter) in the DerivativeParsedMaterial

[./eigenstrain_prefactor]
  type = DerivativeParsedMaterial
  block = 0
  expression = 'c-0.1'
  coupled_variables = c
  property_name = eigenstrain_prefactor
  derivative_order = 1
[../]
(moose/modules/combined/test/tests/DiffuseCreep/variable_base_eigen_strain.i)

Finally, the eigenstrain_name parameter value must also be set for the strain calculator, and an example parameter setting is shown below:

[./strain]
  type = ComputeIncrementalStrain
  displacements = 'disp_x disp_y'
  eigenstrain_names = eigenstrain
[../]
(moose/modules/combined/test/tests/DiffuseCreep/variable_base_eigen_strain.i)

Input Parameters

  • base_tensor_property_nameName of base tensor property

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Name of base tensor property

  • eigenstrain_nameMaterial property name for the eigenstrain tensor computed by this model. IMPORTANT: The name of this property must also be provided to the strain calculator.

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:Material property name for the eigenstrain tensor computed by this model. IMPORTANT: The name of this property must also be provided to the strain calculator.

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

    Unit:(no unit assumed)

    Controllable:No

    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 blocks (ids or names) that this object will be applied

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

    Unit:(no unit assumed)

    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>

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    Controllable:No

    Description:An optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.

  • offset_tensorVector of values defining the constant base tensor for the Eigenstrain

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

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of values defining the constant base tensor for the Eigenstrain

  • prefactor1Name of material defining the variable dependence

    Default:1

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Name of material defining the variable dependence

  • 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

    Unit:(no unit assumed)

    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.

  • use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

Optional Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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>

    Unit:(no unit assumed)

    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>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object

Outputs Parameters

References

No citations exist within this document.