- argsvariable dependencies for the prefactor
C++ Type:std::vector<VariableName>
Controllable:No
Description:variable dependencies for the prefactor
- eigen_baseVector of values defining the constant base tensor for the Eigenstrain
C++ Type:std::vector<double>
Controllable:No
Description:Vector of values defining the constant base tensor for the Eigenstrain
- 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
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.
Compute Variable Eigenstrain
Computes an Eigenstrain and its derivatives that is a function of multiple variables, where the prefactor is defined in a derivative material
Description
ComputeVariableEigenstrain calculates the eigenstrain as a function of a specified variable as well as the contributions of the eigenstrain to the first and second order derivatives of the elastic strain. This class is most often only used in phase field simulations where first and second derivatives are required and the limitation on elastic only strains is not overly restrictive.
The Rank-2 tensor eigenstrain is calculated as a function of a Rank-2 tensor base and a scalar material property. (1) where is the computed eigenstrain, is a scalar material property, and is the tensor selected by the user as the base of the eigenstrain. The material property is used to introduce dependence of the eigenstrain on the user-specified variable.
The contributions of the eigenstrain to the first and second elastic strain derivatives are calculated with use of the MOOSE DerivativeMaterialInterface applied to the prefactor variables. (2) where and are the first and second derivatives of the elastic strain contributions due to the eigenstrain.
warningwarning:Use with Elastic Strain Only
This class assumes the presence of only elastic strain in the computation of the first and second derivatives.
Example Input File
[./eigenstrain]
type = ComputeVariableEigenstrain
eigen_base = '1'
args = c
prefactor = prefactor
eigenstrain_name = eigenstrain
[../]
where the argument for the args parameter in the eigenstrain matches the name of the coupled variable, here shown as an auxvariable
[./c]
order = FIRST
family = LAGRANGE
[./InitialCondition]
type = SmoothCircleIC
x1 = 125.0
y1 = 125.0
radius = 60.0
invalue = 1.0
outvalue = 0.1
int_width = 50.0
[../]
[../]
and the argument for the prefactor parameter in the eigenstrain material matches the function name (f_name parameter) in the DerivativeParsedMaterial
[./prefactor]
type = DerivativeParsedMaterial
coupled_variables = c
property_name = prefactor
constant_names = 'epsilon0 c0'
constant_expressions = '0.05 0'
expression = '(c - c0) * epsilon0'
[../]
Finally, the eigenstrain_name parameter value must also be set for the strain calculator, and an example parameter setting is shown below:
[./strain]
type = ComputeSmallStrain
eigenstrain_names = eigenstrain
[../]
Input 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
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>
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
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.
- prefactor1Name of material property defining the variable dependence
Default:1
C++ Type:MaterialPropertyName
Controllable:No
Description:Name of material property 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
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