SS316 Thermal and Irradiation Creep

Thermal and irradiation creep for SS AISI 316 based on: 'High Temperature Inelastic Behavior of the Austenitic Steel AISI Type 316' by H. Altenbach and Y. Gorash, 2013 'Irradiation Creep and Swelling of AISI 316 to Exposures of 130 dpa at 385-400 degrees C' by F. Garner and D. Porter

Description

This material, SS316CreepUpdate, computes the steady state creep, the sum of thermal and irradiation creep, using Eq. 1, following Altenbach and Gorash (2013) and Garner and Porter (1988). (1) where is the neutron flux (n/cm-s), is the temperature (K), is the effective stress (MPa), and is the effective thermal and irradiation creep strain rate (1/s). The parameters for the model are given in Table 1.

Table 1: Parameters for the SS316 Creep Model

ParametersValues
$ 170000 J/mol$

Example Input Syntax


[./creep]
  type = SS316CreepUpdate
  fast_neutron_flux = fast_neutron_flux
[../]
(test/tests/tensor_mechanics/SS316_creep/creep_SS316_3d_test.i)

SS316CreepUpdate must be run in conjunction with the inelastic strain return mapping stress calculator as shown below:


[./radial_return_stress]
  type = ComputeMultipleInelasticStress
  tangent_operator = elastic
  inelastic_models = 'creep'
[../]
(test/tests/tensor_mechanics/SS316_creep/creep_SS316_3d_test.i)

Input Parameters

  • a21.0489Leading term of first thermal exponential

    Default:21.0489

    C++ Type:double

    Description:Leading term of first thermal exponential

  • B1e-06Creep compliance term, considered to be temprature independent for most autenitic stainless steels

    Default:1e-06

    C++ Type:double

    Description:Creep compliance term, considered to be temprature independent for most autenitic stainless steels

  • max_inelastic_increment0.0001The maximum inelastic strain increment allowed in a time step

    Default:0.0001

    C++ Type:double

    Description:The maximum inelastic strain increment allowed in a time step

  • D0.006Stress-coupling coefficient, also considered to be relatively constant for austenitic stainless steels

    Default:0.006

    C++ Type:double

    Description:Stress-coupling coefficient, also considered to be relatively constant for austenitic stainless steels

  • 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

    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.

  • max_its30Maximum number of Newton iterations

    Default:30

    C++ Type:unsigned int

    Description:Maximum number of Newton iterations

  • Q_ln170000Activation energy of first thermal exponential

    Default:170000

    C++ Type:double

    Description:Activation energy of first thermal exponential

  • Q_pw12000Activation energy of second thermal exponential within sinh term

    Default:12000

    C++ Type:double

    Description:Activation energy of second thermal exponential within sinh term

  • S0.01Swelling rate per dpa, constant above approximately 400 C for most austenitic stainless steels

    Default:0.01

    C++ Type:double

    Description:Swelling rate per dpa, constant above approximately 400 C for most austenitic stainless steels

  • R8.314Universal gas constant

    Default:8.314

    C++ Type:double

    Description:Universal gas constant

  • fast_neutron_fluxThe fast neutron flux

    C++ Type:std::vector

    Description:The fast neutron flux

  • absolute_tolerance1e-11Absolute convergence tolerance for Newton iteration

    Default:1e-11

    C++ Type:double

    Description:Absolute convergence tolerance for Newton iteration

  • 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

  • acceptable_multiplier10Factor applied to relative and absolute tolerance for acceptable convergence if iterations are no longer making progress

    Default:10

    C++ Type:double

    Description:Factor applied to relative and absolute tolerance for acceptable convergence if iterations are no longer making progress

  • b0.7Leading term of second thermal exponential within sinh term.

    Default:0.7

    C++ Type:double

    Description:Leading term of second thermal exponential within sinh term.

  • relative_tolerance1e-08Relative convergence tolerance for Newton iteration

    Default:1e-08

    C++ Type:double

    Description:Relative convergence tolerance for Newton iteration

  • 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

  • temperatureThe coupled temperature

    C++ Type:std::vector

    Description:The coupled temperature

Optional Parameters

  • effective_inelastic_strain_nameeffective_creep_strainName of the material property that stores the effective inelastic strain

    Default:effective_creep_strain

    C++ Type:std::string

    Description:Name of the material property that stores the effective inelastic strain

  • 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

Advanced Parameters

  • internal_solve_output_onon_errorWhen to output internal Newton solve information

    Default:on_error

    C++ Type:MooseEnum

    Description:When to output internal Newton solve information

  • internal_solve_full_iteration_historyFalseSet true to output full internal Newton iteration history at times determined by `internal_solve_output_on`. If false, only a summary is output.

    Default:False

    C++ Type:bool

    Description:Set true to output full internal Newton iteration history at times determined by `internal_solve_output_on`. If false, only a summary is output.

Debug Parameters

  • 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

Outputs Parameters

Input Files

References

  1. Holm Altenbach and Yevgen Gorash. High-temperature inelastic behavior of the austenitic steel aisi type 316. In Advanced Materials Modelling for Structures, pages 17–30. Springer, 2013.[BibTeX]
  2. FA Garner and DL Porter. Irradiation creep and swelling of aisi 316 to exposures of 130 dpa at 385–400 c. Journal of Nuclear Materials, 155:1006–1013, 1988.[BibTeX]