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FiniteStrainHyperElasticViscoPlastic

under construction:Undocumented Class

The FiniteStrainHyperElasticViscoPlastic has not been documented. The content contained on this page includes the basic documentation associated with a MooseObject; however, what is contained is ultimately determined by what is necessary to make the documentation clear for users.

Material class for hyper-elastic visco-platic flow: Can handle multiple flow models defined by flowratemodel type user objects

Input Parameters

internal_var_user_objectsList of User object names that integrates internal variables and computes derivatives
C++ Type:std::vector
Options:
Description:List of User object names that integrates internal variables and computes derivatives
strength_user_objectsList of User object names that computes strength variables and derivatives
C++ Type:std::vector
Options:
Description:List of User object names that computes strength variables and derivatives
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
Options:
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.
base_nameOptional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases
C++ Type:std::string
Options:
Description:Optional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases
max_substep_iteration1Maximum number of substep iteration
Default:1
C++ Type:unsigned int
Options:
Description:Maximum number of substep iteration
maxiters50Maximum iteration for flow rate update
Default:50
C++ Type:unsigned int
Options:
Description:Maximum iteration for flow rate update
resid_rel_tol1e-06Relative Tolerance for flow rate residual equation
Default:1e-06
C++ Type:double
Options:
Description:Relative Tolerance for flow rate residual equation
blockThe list of block ids (SubdomainID) that this object will be applied
C++ Type:std::vector
Options:
Description:The list of block ids (SubdomainID) that this object will be applied
resid_abs_tol1e-10Absolute Tolerance for flow rate residual equation
Default:1e-10
C++ Type:double
Options:
Description:Absolute Tolerance for flow rate residual equation
boundaryThe list of boundary IDs from the mesh where this boundary condition applies
C++ Type:std::vector
Options:
Description:The list of boundary IDs from the mesh where this boundary condition applies
internal_var_rate_user_objectsList of User object names that computes internal variable rates and derivatives
C++ Type:std::vector
Options:
Description:List of User object names that computes internal variable rates and derivatives
flow_rate_user_objectsList of User object names that computes flow rate and derivatives
C++ Type:std::vector
Options:
Description:List of User object names that computes flow rate and derivatives

Optional Parameters

output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)
C++ Type:std::vector
Options:
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
Options:
Description:Vector of output names were you would like to restrict the output of variables(s) associated with this object

Outputs 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.
seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
Options:
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
Options:
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
Options:NONE ELEMENT SUBDOMAIN
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

Input Files

modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem_base.i
modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem_linear_harden.i
modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem.i
modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem_multi.i

modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem_base.i

[Mesh]
  type = GeneratedMesh
  dim = 3
  elem_type = HEX8
  displacements = 'ux uy uz'
[]

[Variables]
  [./ux]
    block = 0
  [../]
  [./uy]
    block = 0
  [../]
  [./uz]
    block = 0
  [../]
[]

[Kernels]
  [./TensorMechanics]
    displacements = 'ux uy uz'
    use_displaced_mesh = true
    base_name = test
  [../]
[]

[AuxVariables]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./peeq]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./fp_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
[]

[AuxKernels]
  [./stress_zz]
    type = RankTwoAux
    variable = stress_zz
    rank_two_tensor = test_stress
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./fp_zz]
    type = RankTwoAux
    variable = fp_zz
    rank_two_tensor = test_fp
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./peeq]
    type = MaterialRealAux
    variable = peeq
    property = ep_eqv
    execute_on = timestep_end
    block = 0
  [../]
[]

[BCs]
  [./symmy]
    type = PresetBC
    variable = uy
    boundary = bottom
    value = 0
  [../]
  [./symmx]
    type = PresetBC
    variable = ux
    boundary = left
    value = 0
  [../]
  [./symmz]
    type = PresetBC
    variable = uz
    boundary = back
    value = 0
  [../]
  [./tdisp]
    type = FunctionPresetBC
    variable = uz
    boundary = front
    function = '0.01*t'
  [../]
[]

[UserObjects]
  [./flowstress]
    type = HEVPRambergOsgoodHardening
    yield_stress = 100
    hardening_exponent = 0.1
    reference_plastic_strain = 0.002
    intvar_prop_name = ep_eqv
  [../]
  [./flowrate]
    type = HEVPFlowRatePowerLawJ2
    reference_flow_rate = 0.0001
    flow_rate_exponent = 50.0
    flow_rate_tol = 1
    strength_prop_name = flowstress
    base_name = test
  [../]
  [./ep_eqv]
     type = HEVPEqvPlasticStrain
     intvar_rate_prop_name = ep_eqv_rate
  [../]
  [./ep_eqv_rate]
     type = HEVPEqvPlasticStrainRate
     flow_rate_prop_name = flowrate
  [../]
[]

[Materials]
  [./strain]
    type = ComputeFiniteStrain
    block = 0
    displacements = 'ux uy uz'
    base_name = test
  [../]
  [./viscop]
    type = FiniteStrainHyperElasticViscoPlastic
    block = 0
    resid_abs_tol = 1e-18
    resid_rel_tol = 1e-8
    maxiters = 50
    max_substep_iteration = 5
    flow_rate_user_objects = 'flowrate'
    strength_user_objects = 'flowstress'
    internal_var_user_objects = 'ep_eqv'
    internal_var_rate_user_objects = 'ep_eqv_rate'
    base_name = test
  [../]
  [./elasticity_tensor]
    type = ComputeElasticityTensor
    block = 0
    C_ijkl = '2.8e5 1.2e5 1.2e5 2.8e5 1.2e5 2.8e5 0.8e5 0.8e5 0.8e5'
    fill_method = symmetric9
    base_name = test
  [../]
[]

[Postprocessors]
  [./stress_zz]
    type = ElementAverageValue
    variable = stress_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./fp_zz]
    type = ElementAverageValue
    variable = fp_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./peeq]
    type = ElementAverageValue
    variable = peeq
    block = 'ANY_BLOCK_ID 0'
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]

[Executioner]
  type = Transient
  dt = 0.02
  #Preconditioned JFNK (default)
  solve_type = 'PJFNK'
  petsc_options_iname = -pc_hypre_type
  petsc_options_value = boomerang
  dtmax = 10.0
  nl_rel_tol = 1e-10
  dtmin = 0.02
  num_steps = 10
[]

[Outputs]
  file_base = one_elem_base
  exodus = true
  csv = false
[]

modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem_linear_harden.i

[Mesh]
  type = GeneratedMesh
  dim = 3
  elem_type = HEX8
  displacements = 'ux uy uz'
[]

[Variables]
  [./ux]
    block = 0
  [../]
  [./uy]
    block = 0
  [../]
  [./uz]
    block = 0
  [../]
[]

[Kernels]
  [./TensorMechanics]
    displacements = 'ux uy uz'
    use_displaced_mesh = true
  [../]
[]

[AuxVariables]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./peeq]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./fp_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
[]

[AuxKernels]
  [./stress_zz]
    type = RankTwoAux
    variable = stress_zz
    rank_two_tensor = stress
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./fp_zz]
    type = RankTwoAux
    variable = fp_zz
    rank_two_tensor = fp
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./peeq]
    type = MaterialRealAux
    variable = peeq
    property = ep_eqv
    execute_on = timestep_end
    block = 0
  [../]
[]

[BCs]
  [./symmy]
    type = PresetBC
    variable = uy
    boundary = bottom
    value = 0
  [../]
  [./symmx]
    type = PresetBC
    variable = ux
    boundary = left
    value = 0
  [../]
  [./symmz]
    type = PresetBC
    variable = uz
    boundary = back
    value = 0
  [../]
  [./tdisp]
    type = FunctionPresetBC
    variable = uz
    boundary = front
    function = '0.01*t'
  [../]
[]

[UserObjects]
  [./flowstress]
    type = HEVPLinearHardening
    yield_stress = 100
    slope = 10
    intvar_prop_name = ep_eqv
  [../]
  [./flowrate]
    type = HEVPFlowRatePowerLawJ2
    reference_flow_rate = 0.0001
    flow_rate_exponent = 50.0
    flow_rate_tol = 1
    strength_prop_name = flowstress
  [../]
  [./ep_eqv]
     type = HEVPEqvPlasticStrain
     intvar_rate_prop_name = ep_eqv_rate
  [../]
  [./ep_eqv_rate]
     type = HEVPEqvPlasticStrainRate
     flow_rate_prop_name = flowrate
  [../]
[]

[Materials]
  [./strain]
    type = ComputeFiniteStrain
    block = 0
    displacements = 'ux uy uz'
  [../]
  [./viscop]
    type = FiniteStrainHyperElasticViscoPlastic
    block = 0
    resid_abs_tol = 1e-18
    resid_rel_tol = 1e-8
    maxiters = 50
    max_substep_iteration = 5
    flow_rate_user_objects = 'flowrate'
    strength_user_objects = 'flowstress'
    internal_var_user_objects = 'ep_eqv'
    internal_var_rate_user_objects = 'ep_eqv_rate'
  [../]
  [./elasticity_tensor]
    type = ComputeElasticityTensor
    block = 0
    C_ijkl = '2.8e5 1.2e5 1.2e5 2.8e5 1.2e5 2.8e5 0.8e5 0.8e5 0.8e5'
    fill_method = symmetric9
  [../]
[]

[Postprocessors]
  [./stress_zz]
    type = ElementAverageValue
    variable = stress_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./fp_zz]
    type = ElementAverageValue
    variable = fp_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./peeq]
    type = ElementAverageValue
    variable = peeq
    block = 'ANY_BLOCK_ID 0'
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]

[Executioner]
  type = Transient
  dt = 0.02
  #Preconditioned JFNK (default)
  solve_type = 'PJFNK'
  petsc_options_iname = -pc_hypre_type
  petsc_options_value = boomerang
  dtmax = 10.0
  nl_rel_tol = 1e-10
  dtmin = 0.02
  num_steps = 10
[]

[Outputs]
  file_base = one_elem_linear_harden
  exodus = true
  csv = false
[]

modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem.i

[Mesh]
  type = GeneratedMesh
  dim = 3
  elem_type = HEX8
  displacements = 'ux uy uz'
[]

[Variables]
  [./ux]
    block = 0
  [../]
  [./uy]
    block = 0
  [../]
  [./uz]
    block = 0
  [../]
[]

[Kernels]
  [./TensorMechanics]
    displacements = 'ux uy uz'
    use_displaced_mesh = true
  [../]
[]

[AuxVariables]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./peeq]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./fp_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
[]

[AuxKernels]
  [./stress_zz]
    type = RankTwoAux
    variable = stress_zz
    rank_two_tensor = stress
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./fp_zz]
    type = RankTwoAux
    variable = fp_zz
    rank_two_tensor = fp
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./peeq]
    type = MaterialRealAux
    variable = peeq
    property = ep_eqv
    execute_on = timestep_end
    block = 0
  [../]
[]

[BCs]
  [./symmy]
    type = PresetBC
    variable = uy
    boundary = bottom
    value = 0
  [../]
  [./symmx]
    type = PresetBC
    variable = ux
    boundary = left
    value = 0
  [../]
  [./symmz]
    type = PresetBC
    variable = uz
    boundary = back
    value = 0
  [../]
  [./tdisp]
    type = FunctionPresetBC
    variable = uz
    boundary = front
    function = '0.01*t'
  [../]
[]

[UserObjects]
  [./flowstress]
    type = HEVPRambergOsgoodHardening
    yield_stress = 100
    hardening_exponent = 0.1
    reference_plastic_strain = 0.002
    intvar_prop_name = ep_eqv
  [../]
  [./flowrate]
    type = HEVPFlowRatePowerLawJ2
    reference_flow_rate = 0.0001
    flow_rate_exponent = 50.0
    flow_rate_tol = 1
    strength_prop_name = flowstress
  [../]
  [./ep_eqv]
     type = HEVPEqvPlasticStrain
     intvar_rate_prop_name = ep_eqv_rate
  [../]
  [./ep_eqv_rate]
     type = HEVPEqvPlasticStrainRate
     flow_rate_prop_name = flowrate
  [../]
[]

[Materials]
  [./strain]
    type = ComputeFiniteStrain
    block = 0
    displacements = 'ux uy uz'
  [../]
  [./viscop]
    type = FiniteStrainHyperElasticViscoPlastic
    block = 0
    resid_abs_tol = 1e-18
    resid_rel_tol = 1e-8
    maxiters = 50
    max_substep_iteration = 5
    flow_rate_user_objects = 'flowrate'
    strength_user_objects = 'flowstress'
    internal_var_user_objects = 'ep_eqv'
    internal_var_rate_user_objects = 'ep_eqv_rate'
  [../]
  [./elasticity_tensor]
    type = ComputeElasticityTensor
    block = 0
    C_ijkl = '2.8e5 1.2e5 1.2e5 2.8e5 1.2e5 2.8e5 0.8e5 0.8e5 0.8e5'
    fill_method = symmetric9
  [../]
[]

[Postprocessors]
  [./stress_zz]
    type = ElementAverageValue
    variable = stress_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./fp_zz]
    type = ElementAverageValue
    variable = fp_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./peeq]
    type = ElementAverageValue
    variable = peeq
    block = 'ANY_BLOCK_ID 0'
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]

[Executioner]
  type = Transient
  dt = 0.02
  #Preconditioned JFNK (default)
  solve_type = 'PJFNK'
  petsc_options_iname = -pc_hypre_type
  petsc_options_value = boomerang
  dtmax = 10.0
  nl_rel_tol = 1e-10
  dtmin = 0.02
  num_steps = 10
[]

[Outputs]
  file_base = one_elem
  exodus = true
  csv = false
[]

modules/tensor_mechanics/test/tests/hyperelastic_viscoplastic/one_elem_multi.i

[Mesh]
  type = GeneratedMesh
  dim = 3
  elem_type = HEX8
  displacements = 'ux uy uz'
[]

[Variables]
  [./ux]
    block = 0
  [../]
  [./uy]
    block = 0
  [../]
  [./uz]
    block = 0
  [../]
[]

[Kernels]
  [./TensorMechanics]
    displacements = 'ux uy uz'
    use_displaced_mesh = true
  [../]
[]

[AuxVariables]
  [./stress_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./peeq_soft]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./peeq_hard]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
  [./fp_zz]
    order = CONSTANT
    family = MONOMIAL
    block = 0
  [../]
[]

[AuxKernels]
  [./stress_zz]
    type = RankTwoAux
    variable = stress_zz
    rank_two_tensor = stress
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./fp_zz]
    type = RankTwoAux
    variable = fp_zz
    rank_two_tensor = fp
    index_j = 2
    index_i = 2
    execute_on = timestep_end
    block = 0
  [../]
  [./peeq_soft]
    type = MaterialRealAux
    variable = peeq_soft
    property = ep_eqv1
    execute_on = timestep_end
    block = 0
  [../]
  [./peeq_hard]
    type = MaterialRealAux
    variable = peeq_hard
    property = ep_eqv2
    execute_on = timestep_end
    block = 0
  [../]
[]

[BCs]
  [./symmy]
    type = PresetBC
    variable = uy
    boundary = bottom
    value = 0
  [../]
  [./symmx]
    type = PresetBC
    variable = ux
    boundary = left
    value = 0
  [../]
  [./symmz]
    type = PresetBC
    variable = uz
    boundary = back
    value = 0
  [../]
  [./tdisp]
    type = FunctionPresetBC
    variable = uz
    boundary = front
    function = '0.01*t'
  [../]
[]

[UserObjects]
  [./flowstress1]
    type = HEVPRambergOsgoodHardening
    yield_stress = 100
    hardening_exponent = 0.1
    reference_plastic_strain = 0.002
    intvar_prop_name = ep_eqv1
  [../]
  [./flowstress2]
    type = HEVPRambergOsgoodHardening
    yield_stress = 100
    hardening_exponent = 0.3
    reference_plastic_strain = 0.002
    intvar_prop_name = ep_eqv2
  [../]
  [./flowrate1]
    type = HEVPFlowRatePowerLawJ2
    reference_flow_rate = 0.0001
    flow_rate_exponent = 50.0
    flow_rate_tol = 1
    strength_prop_name = flowstress1
  [../]
  [./flowrate2]
    type = HEVPFlowRatePowerLawJ2
    reference_flow_rate = 0.0001
    flow_rate_exponent = 50.0
    flow_rate_tol = 1
    strength_prop_name = flowstress2
  [../]
  [./ep_eqv1]
     type = HEVPEqvPlasticStrain
     intvar_rate_prop_name = ep_eqv_rate1
  [../]
  [./ep_eqv_rate1]
     type = HEVPEqvPlasticStrainRate
     flow_rate_prop_name = flowrate1
  [../]
  [./ep_eqv2]
     type = HEVPEqvPlasticStrain
     intvar_rate_prop_name = ep_eqv_rate2
  [../]
  [./ep_eqv_rate2]
     type = HEVPEqvPlasticStrainRate
     flow_rate_prop_name = flowrate2
  [../]
[]

[Materials]
  [./strain]
    type = ComputeFiniteStrain
    block = 0
    displacements = 'ux uy uz'
  [../]
  [./viscop]
    type = FiniteStrainHyperElasticViscoPlastic
    block = 0
    resid_abs_tol = 1e-18
    resid_rel_tol = 1e-8
    maxiters = 50
    max_substep_iteration = 5
    flow_rate_user_objects = 'flowrate1 flowrate2'
    strength_user_objects = 'flowstress1 flowstress2'
    internal_var_user_objects = 'ep_eqv1 ep_eqv2'
    internal_var_rate_user_objects = 'ep_eqv_rate1 ep_eqv_rate2'
  [../]
  [./elasticity_tensor]
    type = ComputeElasticityTensor
    block = 0
    C_ijkl = '2.8e5 1.2e5 1.2e5 2.8e5 1.2e5 2.8e5 0.8e5 0.8e5 0.8e5'
    fill_method = symmetric9
  [../]
[]

[Postprocessors]
  [./stress_zz]
    type = ElementAverageValue
    variable = stress_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./fp_zz]
    type = ElementAverageValue
    variable = fp_zz
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./peeq_soft]
    type = ElementAverageValue
    variable = peeq_soft
    block = 'ANY_BLOCK_ID 0'
  [../]
  [./peeq_hard]
    type = ElementAverageValue
    variable = peeq_hard
    block = 'ANY_BLOCK_ID 0'
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]

[Executioner]
  type = Transient
  dt = 0.02

  #Preconditioned JFNK (default)
  solve_type = 'PJFNK'

  petsc_options_iname = -pc_hypre_type
  petsc_options_value = boomerang
  dtmax = 10.0
  nl_rel_tol = 1e-10
  dtmin = 0.02
  num_steps = 10
[]

[Outputs]
  file_base = one_elem_multi
  exodus = true
  csv = false
[]

Child Objects

modules/tensor_mechanics/include/materials/HyperElasticPhaseFieldIsoDamage.h

modules/tensor_mechanics/include/materials/HyperElasticPhaseFieldIsoDamage.h

// This file is part of the MOOSE framework
// https://www.mooseframework.org
//
// All rights reserved, see COPYRIGHT for full restrictions
// https://github.com/idaholab/moose/blob/master/COPYRIGHT
//
// Licensed under LGPL 2.1, please see LICENSE for details
// https://www.gnu.org/licenses/lgpl-2.1.html

#ifndef HYPERELASTICPHASEFIELDISODAMAGE_H
#define HYPERELASTICPHASEFIELDISODAMAGE_H

#include "FiniteStrainHyperElasticViscoPlastic.h"

class HyperElasticPhaseFieldIsoDamage;

template <>
InputParameters validParams<HyperElasticPhaseFieldIsoDamage>();

/**
 * This class solves visco plastic model based on isotropically damaged stress
 * The damage parameter is obtained from phase field fracture kernel
 * Computes undamaged elastic strain energy and associated tensors used in phase field fracture
 * kernel
 */
class HyperElasticPhaseFieldIsoDamage : public FiniteStrainHyperElasticViscoPlastic
{
public:
  HyperElasticPhaseFieldIsoDamage(const InputParameters & parameters);

protected:
  /// This function computes PK2 stress
  virtual void computePK2StressAndDerivative();
  /**
   * This function computes PK2 stress modified to account for damage
   * Computes numerical stiffness if flag is true
   * Computes undamaged elastic strain energy and associated tensors
   */
  virtual void computeDamageStress();
  /// This function computes numerical stiffness
  virtual void computeNumStiffness();
  /// This function computes tensors used to construct diagonal and off-diagonal Jacobian
  virtual void computeQpJacobian();

  /// Flag to compute numerical stiffness
  bool _num_stiffness;
  /// Small stiffness of completely damaged material point
  Real _kdamage;
  /// Use current value of history variable
  bool _use_current_hist;
  /// Material property defining crack width, declared elsewhere
  const MaterialProperty<Real> & _l;
  /// Material property defining gc parameter, declared elsewhere
  const MaterialProperty<Real> & _gc;
  /// Used in numerical stiffness calculation to check near zero values
  Real _zero_tol;
  /// Perturbation value for near zero or zero strain components
  Real _zero_pert;
  /// Perturbation value for strain components
  Real _pert_val;
  /// Compupled damage variable
  const VariableValue & _c;
  /// Flag to save couple material properties
  bool _save_state;

  MaterialProperty<RankTwoTensor> & _dstress_dc;

  RankTwoTensor _pk2_tmp, _dG0_dee, _dpk2_dc;
  RankFourTensor _dpk2_dee;
  std::vector<RankTwoTensor> _etens;

  /// Elastic energy and derivatives, declared in this material
  MaterialProperty<Real> & _F;
  MaterialProperty<Real> & _dFdc;
  MaterialProperty<Real> & _d2Fdc2;
  MaterialProperty<RankTwoTensor> & _d2Fdcdstrain;

  /// History variable that prevents crack healing, declared in this material
  MaterialProperty<Real> & _hist;

  /// Old value of history variable
  const MaterialProperty<Real> & _hist_old;
};

#endif

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