Linear Viscoelastic Stress Update

Calculates an admissible state (stress that lies on or within the yield surface, plastic strains, internal parameters, etc). This class is intended to be a parent class for classes with specific constitutive models.

Description

This computes the inelastic strain increment resulting from a linear viscoelastic material such as a GeneralizedKelvinVoigtModel or a GeneralizedMaxwellModel material. It uses an incremental strain approximation (either incremental small strains, or finite strains), and needs to be used in conjunction with ComputeMultipleInelasticStress or a similar stress calculator.

Example Input File Syntax

[./creep]
  type = LinearViscoelasticStressUpdate
[../]
(moose/modules/solid_mechanics/test/tests/visco/gen_maxwell_driving.i)

LinearViscoelasticStressUpdate must be run in conjunction with the inelastic strain return mapping stress calculator as shown below:

[./stress]
  type = ComputeMultipleInelasticStress
  inelastic_models = 'creep'
[../]
(moose/modules/solid_mechanics/test/tests/visco/gen_maxwell_driving.i)

Input Parameters

  • apparent_creep_strainapparent_creep_strainname of the apparent creep strain (defined by a LinearViscoelasticityBase material)

    Default:apparent_creep_strain

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:name of the apparent creep strain (defined by a LinearViscoelasticityBase material)

  • apparent_elasticity_tensorapparent_elasticity_tensorname of the apparent elasticity tensor (defined by a LinearViscoelasticityBase material)

    Default:apparent_elasticity_tensor

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:name of the apparent elasticity tensor (defined by a LinearViscoelasticityBase material)

  • base_nameOptional parameter that defines a prefix for all material properties related to this stress update model. This allows for multiple models of the same type to be used without naming conflicts.

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:Optional parameter that defines a prefix for all material properties related to this stress update model. This allows for multiple models of the same type to be used without naming conflicts.

  • 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

  • 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.

  • elasticity_tensor_invelasticity_tensor_invname of the real compliance tensor (defined by a LinearViscoelasticityBase material)

    Default:elasticity_tensor_inv

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:name of the real compliance tensor (defined by a LinearViscoelasticityBase material)

  • 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