# Isotropic Volumetric Swelling for FeCrAl

Computes a volumetric strain to account for irradiation induced swelling of FeCrAl alloys used for cladding

warning:Deprecated Solid Mechanics Material

The functionality of this solid mechanics material is being replaced in the TensorMechanics system by FeCrAlVolumetricSwellingEigenstrain.

## Description

The VSwellingFeCrAl model computes a volumetric strain to account for irradiation induced swelling of FeCrAl alloys used for cladding.

It is expected that FeCrAl alloys will be subjected to irradiation induced swelling due to their cubic crystal structure. As an approximation for the swelling of FeCrAl alloys a simplistic model provided in Terrani et al. (2016) has been implemented in Bison. The estimated swelling rate is 0.05% per dpa. Using the same conversion factor as suggested above for irradiation creep (1 10 n/m = 0.9 dpa) the volumetric swelling strain rate is given by: (1) Integrating over time the volumetric swelling is given by (2) where is the fast neutron fluence given in n/m.

## Example Input Syntax


[./swelling]
type = VSwellingFeCrAl
block = '1 2 3 4 5 6 7'
fast_neutron_fluence = fluence
swelling_scalef = 1.0
[../]
(test/tests/fecral/swelling/swelling.i)

## Input Parameters

• fast_neutron_fluenceCoupled fast neutron fluence

C++ Type:std::vector

Description:Coupled fast neutron fluence

• boundaryThe list of boundary IDs from the mesh where this boundary condition applies

C++ Type:std::vector

Description:The list of boundary IDs from the mesh where this boundary condition applies

• computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the Material via MaterialPropertyInterface::getMaterial(). Non-computed Materials are not sorted for dependencies.

Default:True

C++ Type:bool

Description:When false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the Material via MaterialPropertyInterface::getMaterial(). Non-computed Materials are not sorted for dependencies.

• blockThe list of block ids (SubdomainID) that this object will be applied

C++ Type:std::vector

Description:The list of block ids (SubdomainID) that this object will be applied

• swelling_scalef1Scale factor on the swelling of the fuel

Default:1

C++ Type:double

Description:Scale factor on the swelling of the fuel

### Optional Parameters

• enableTrueSet the enabled status of the MooseObject.

Default:True

C++ Type:bool

Description:Set the enabled status of the MooseObject.

• 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

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.

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

C++ Type:std::vector

Description:Adds user-defined labels for accessing object parameters via control logic.

• seed0The seed for the master random number generator

Default:0

C++ Type:unsigned int

Description:The seed for the master random number generator

• implicitTrueDetermines whether this object is calculated using an implicit or explicit form

Default:True

C++ Type:bool

Description:Determines whether this object is calculated using an implicit or explicit form

• 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 computeSubdomainProperties() 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

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

• output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)

C++ Type:std::vector

Description:List of material properties, from this material, to output (outputs must also be defined to an output type)

• outputsnone Vector of output names were you would like to restrict the output of variables(s) associated with this object

Default:none

C++ Type:std::vector

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

## References

1. K. A. Terrani, T. M. Karlsen, and Y. Yamamoto. Input correlations for irradiation creep of FeCrAl and SiC based on in-pile Halden test results. Technical Report ORNL/TM-2016/191, ORNL, May 2016.[BibTeX]