- displacementsThe displacements appropriate for the simulation geometry and coordinate system
C++ Type:std::vector<VariableName>
Controllable:No
Description:The displacements appropriate for the simulation geometry and coordinate system
Compute Axisymmetric 1D Finite Strain
Compute a strain increment and rotation increment for finite strains in an axisymmetric 1D problem
Description
The material ComputeAxisymmetric1DFiniteStrain calculates the finite strain for 1D Axisymmetric systems and is intended for use with Generalized Plane Strain simulations. This material assumes symmetry about the -axis. This 'strain calculator' material computes the strain within the cylindrical coordinate system and relies on the specialized Axisymmetric RZ kernel to handle the stress divergence calcuation.
warningwarning:Symmetry Assumed About the -axis
The axis of symmetry must lie along the -axis in a cylindrical coordinate system. This symmetry orientation is required for the calculation of the residual and of the jacobian. See StressDivergenceRZTensors for the residual equation and the germane discussion.
1D Axisymmetric Strain Formulation
The axisymmetric model uses the cylindrical coordinates, , , and , where the linear section formed by the axis is rotated about the axis in the direction. The incremental deformation gradient for the 1D axisymmetric system is defined as (1) where is the Rank-2 identity tensor, and the deformation gradient, , and the old deformation gradient, , are given as (2) Note that uses the values of the strain expressions from the previous time step. The components of the tensors in Eq. (2) are given as (3) where is a prescribed out-of-plane strain value: this strain value can be given either as a scalar variable or a nonlinear variable. The Generalized Plane Strain problems use scalar variables. The value of the strain depends on the displacement and position in the radial direction.
commentnote:Notation Order Change
The axisymmetric system changes the order of the displacement vector from , usually seen in textbooks, to . Take care to follow this convention in your input files and when adding eigenstrains or extra stresses.
Once the incremental deformation gradient (Eq. (1)) is calculated for the 1D geometry, the deformation gradient is passed to the strain and rotation methods used by default 3D Cartesian simulations, as described in the Finite Strain Class documentation.
Example Input File
commentnote:Use RZ Coordinate Type
The coordinate type in the Problem block of the input file must be set to COORD_TYPE = RZ.
The common use of the ComputeAxisymmetric1DFiniteStrain class is with the Generalized Plane Strain system; this type of simulation uses the scalar strain variables
[./strain]
type = ComputeAxisymmetric1DFiniteStrain
eigenstrain_names = eigenstrain
scalar_out_of_plane_strain = scalar_strain_yy
[../]
which uses a scalar variable for the coupled out-of-plane strain; the arguement for the scalar_out_of_plane_strain parameter is the name of the scalar strain variable:
[./scalar_strain_yy]
order = FIRST
family = SCALAR
[../]
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.
- decomposition_methodTaylorExpansionMethods to calculate the strain and rotation increments
Default:TaylorExpansion
C++ Type:MooseEnum
Controllable:No
Description:Methods to calculate the strain and rotation increments
- eigenstrain_namesList of eigenstrains to be applied in this strain calculation
C++ Type:std::vector<MaterialPropertyName>
Controllable:No
Description:List of eigenstrains to be applied in this strain calculation
- global_strainOptional material property holding a global strain tensor applied to the mesh as a whole
C++ Type:MaterialPropertyName
Controllable:No
Description:Optional material property holding a global strain tensor applied to the mesh as a whole
- out_of_plane_strainNonlinear variable for axisymmetric 1D problem
C++ Type:std::vector<VariableName>
Controllable:No
Description:Nonlinear variable for axisymmetric 1D problem
- 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_out_of_plane_strainScalar variable for axisymmetric 1D problem
C++ Type:std::vector<VariableName>
Controllable:No
Description:Scalar variable for axisymmetric 1D problem
- subblock_index_providerSubblockIndexProvider user object name
C++ Type:UserObjectName
Controllable:No
Description:SubblockIndexProvider user object name
- volumetric_locking_correctionFalseFlag to correct volumetric locking
Default:False
C++ Type:bool
Controllable:No
Description:Flag to correct volumetric locking
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