ComputeIsotropicElasticityTensorSoil

Compute an isotropic elasticity tensor for a layered soil material when shear modulus or elastic modulus, poisson's ratio and density are provided as input for each layer.

Description

There are three essential components which describe the mechanical behavior of a material. These are strain formulation, stress formulation and an elasticity tensor which connects the strains to stresses. In MASTODON, these three can be specified separately. This class defines the elasticity tensor for an isotropic material.

The elasticity tensor () is a fourth order tensor containing 81 components. In the case of an isotropic material, can be constructed using just 2 independent constants which in this case are the shear modulus () and the Poisson's ratio (). The elasticity tensor is a material property which is defined at quadrature point. So different parts of the domain can have different values for .

This material has been designed for a layered soil material in which each layer can have a different shear modulus, Poisson's ratio and density (). The different layers are distinguished using an elemental AuxVariable that defines a "layer id" for each element within the mesh. Thus, the layer variable is a required parameter in the input. The shear modulus, Poisson's ratio and density are mapped to this "layer id".

This material also computes and stores the shear wave speed (), P wave speed () for quadrature point from the layer id, shear modulus, Poisson's ratio and density of the material.

The shear wave speed is calculated as: V_s = \sqrt{\frac{G}{\rho}}

The P wave speed is calculated as: V_p = \sqrt{\frac{2G(1-\nu)}{(1-2\nu)\rho}}

Input Parameters

  • densityVector of density values that map one-to-one with the number 'layer_ids' parameter.

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of density values that map one-to-one with the number 'layer_ids' parameter.

  • layer_idsVector of layer ids that map one-to-one with the 'shear_modulus' or 'elastic_modulus', 'poissons_ratio' and 'density' input parameters.

    C++ Type:std::vector<unsigned int>

    Controllable:No

    Description:Vector of layer ids that map one-to-one with the 'shear_modulus' or 'elastic_modulus', 'poissons_ratio' and 'density' input parameters.

  • layer_variableThe variable providing the soil layer identification.

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The variable providing the soil layer identification.

  • poissons_ratioVector of Poisson's ratio values that map one-to-one with the number 'layer_ids' parameter.

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of Poisson's ratio values that map one-to-one with the number 'layer_ids' parameter.

Required Parameters

  • 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

    Controllable:No

    Description:Optional parameter that allows the user to define multiple mechanics material systems on the same block, i.e. for multiple phases

  • 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

    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.

  • elastic_modulusVector of elastic modulus values that map one-to-one with the number 'layer_ids' parameter.

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of elastic modulus values that map one-to-one with the number 'layer_ids' parameter.

  • elasticity_tensor_prefactorOptional function to use as a scalar prefactor on the elasticity tensor.

    C++ Type:FunctionName

    Unit:(no unit assumed)

    Controllable:No

    Description:Optional function to use as a scalar prefactor on the elasticity tensor.

  • scale_factor_density1Scale factor for density.

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:Yes

    Description:Scale factor for density.

  • shear_modulusVector of shear modulus values that map one-to-one with the number 'layer_ids' parameter.

    C++ Type:std::vector<double>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of shear modulus values that map one-to-one with the number 'layer_ids' parameter.

  • wave_speed_calculationTrueSet to False to turn off P and S wave speed calculation.

    Default:True

    C++ Type:bool

    Controllable:No

    Description:Set to False to turn off P and S wave speed calculation.

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

  • 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

    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.

Material Property Retrieval Parameters

Input Files