GlobalStrain

Scalar Kernel to solve for the global strain

Description

GlobalStrain solves the ODE equation setting the integral of the stress generated by applied load or volume change unrelated to deformation to zero. It stores the strain components into scalar variables of different order. Strain components calculated from this scalar kernel contributes towards the periodic strain. Combined with periodic displacements, this helps maintaining full strain periodicity.

It requires an input of the UserObject that calculates the integral value and corresponding jacobians.

Please refer to GlobalStrainUserObject for information about the residual and jacobian calculation.

Example Input File Syntax

[./global_strain]
  type = GlobalStrain
  variable = global_strain
  global_strain_uo = global_strain_uo
[../]
(modules/tensor_mechanics/test/tests/global_strain/global_strain.i)

Input Parameters

  • variableThe name of the variable that this kernel operates on

    C++ Type:NonlinearVariableName

    Options:

    Description:The name of the variable that this kernel operates on

  • global_strain_uoThe name of the GlobalStrainUserObject

    C++ Type:UserObjectName

    Options:

    Description:The name of the GlobalStrainUserObject

Required Parameters

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

    C++ Type:std::vector

    Options:

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

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Options:

    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

    Options:

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

  • 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

    Options:

    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

  • vector_tagsnontimeThe tag for the vectors this Kernel should fill

    Default:nontime

    C++ Type:MultiMooseEnum

    Options:nontime time

    Description:The tag for the vectors this Kernel should fill

  • extra_vector_tagsThe extra tags for the vectors this Kernel should fill

    C++ Type:std::vector

    Options:

    Description:The extra tags for the vectors this Kernel should fill

  • matrix_tagssystemThe tag for the matrices this Kernel should fill

    Default:system

    C++ Type:MultiMooseEnum

    Options:nontime system

    Description:The tag for the matrices this Kernel should fill

  • extra_matrix_tagsThe extra tags for the matrices this Kernel should fill

    C++ Type:std::vector

    Options:

    Description:The extra tags for the matrices this Kernel should fill

Tagging Parameters

Input Files