ComputeLagrangianWrappedStress

Stress update based on the small (engineering) stress

Overview

This class wraps the information returned by MOOSE materials inheriting from StressUpdateBase for use with the Lagrangian kernel system. To use the current MOOSE materials the user simply adds this wrapper object to the [Materials] block in their input file, in addition to the definition of the actual MOOSE material.

For small deformation problems this wrapper simply provides the engineering strain to the MOOSE material and maps the output engineering stress and Jacobian into the material property names expected by the Lagrangian kernels.

For large deformation problems the wrapper uses the MOOSE material to provide the small deformation/engineering stress update, ignoring the existing finite rotations update used in the current kernels. Instead, this wrapper applies the objective integration described in the ComputeLagraignaObjectiveStress object to convert the engineering stress provided by the MOOSE material to the Cauchy and Piola-Kirchhoff stresses needed by the Lagrangian kernels. This process is adequate for most materials, but will not produce the expected results for anisotropic materials or for materials "natively" providing a large deformation stress update, like crystal plasticity. For this materials users should consider writing a custom wrapper or transitioning the material model to inherit from the new material system base classes.

Example Input File Syntax

The user provides only the name of the stress and Jacobian MaterialProperty produced by the MOOSE material. For most situations the default values are sufficient and the user doesn't have to provide any parameters for the object.

The following example wraps a simple J2 plasticity model for use with the new kernels.

[Materials]
  [elastic_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 100000.0
    poissons_ratio = 0.3
  []
  [compute_stress]
    type = ComputeLagrangianWrappedStress
  []
  [compute_stress_base]
    type = ComputeMultiPlasticityStress
    plastic_models = j2
    ep_plastic_tolerance = 1E-9
  []
  [compute_strain]
    type = ComputeLagrangianStrain
  []
[]
(moose/modules/tensor_mechanics/test/tests/lagrangian/cartesian/updated/cross_material/correctness/plastic_j2.i)

Input Parameters

  • base_nameMaterial property base name

    C++ Type:std::string

    Controllable:No

    Description:Material property base name

  • 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

    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

    Controllable:No

    Description:An optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.

  • input_jacobianJacobian_multThe name of the engineering stress/strain Jacobian from the wrapped material

    Default:Jacobian_mult

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:The name of the engineering stress/strain Jacobian from the wrapped material

  • input_stressstressThe name of the engineering stress from the wrapped material

    Default:stress

    C++ Type:MaterialPropertyName

    Controllable:No

    Description:The name of the engineering stress from the wrapped material

  • large_kinematicsFalseUse a large displacement stress update.

    Default:False

    C++ Type:bool

    Controllable:No

    Description:Use a large displacement stress update.

  • objective_ratetruesdellWhich type of objective integration to use

    Default:truesdell

    C++ Type:MooseEnum

    Options:truesdell, jaumann, green_naghdi

    Controllable:No

    Description:Which type of objective integration to use

  • 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

Outputs Parameters