GRINS::HookesLaw1D Class Reference

Hooke's law specialized for one-dimensional problems. More...

#include <hookes_law_1d.h>

Inheritance diagram for GRINS::HookesLaw1D:

Collaboration diagram for GRINS::HookesLaw1D:

Public Member Functions
	HookesLaw1D (const GetPot &input)
	HookesLaw1D (const GetPot &input, const std::string &material)
virtual	~HookesLaw1D ()
Public Member Functions inherited from GRINS::StressStrainLaw< HookesLaw1D >
	StressStrainLaw ()
virtual	~StressStrainLaw ()
void	compute_stress (unsigned int dim, const libMesh::TensorValue< libMesh::Real > &g_contra, const libMesh::TensorValue< libMesh::Real > &g_cov, const libMesh::TensorValue< libMesh::Real > &G_contra, const libMesh::TensorValue< libMesh::Real > &G_cov, libMesh::TensorValue< libMesh::Real > &stress)
void	compute_stress_and_elasticity (unsigned int dim, const libMesh::TensorValue< libMesh::Real > &g_contra, const libMesh::TensorValue< libMesh::Real > &g_cov, const libMesh::TensorValue< libMesh::Real > &G_contra, const libMesh::TensorValue< libMesh::Real > &G_cov, libMesh::TensorValue< libMesh::Real > &stress, ElasticityTensor &C)
libMesh::Real	compute_33_stress (const libMesh::TensorValue< libMesh::Real > &g_contra, const libMesh::TensorValue< libMesh::Real > &g_cov, const libMesh::TensorValue< libMesh::Real > &G_contra, const libMesh::TensorValue< libMesh::Real > &G_cov)
	This is primarily a helper function for the plane stress cases. More...
Public Member Functions inherited from GRINS::ParameterUser
	ParameterUser (const std::string &user_name)
virtual	~ParameterUser ()
virtual void	set_parameter (libMesh::Number &param_variable, const GetPot &input, const std::string &param_name, libMesh::Number param_default)
	Each subclass can simultaneously read a parameter value from. More...
virtual void	set_parameter (libMesh::ParsedFunction< libMesh::Number, libMesh::Gradient > &func, const GetPot &input, const std::string &func_param_name, const std::string &param_default)
	Each subclass can simultaneously read a parsed function from. More...
virtual void	set_parameter (libMesh::ParsedFEMFunction< libMesh::Number > &func, const GetPot &input, const std::string &func_param_name, const std::string &param_default)
	Each subclass can simultaneously read a parsed function from. More...
virtual void	move_parameter (const libMesh::Number &old_parameter, libMesh::Number &new_parameter)
	When cloning an object, we need to update parameter pointers. More...
virtual void	move_parameter (const libMesh::ParsedFunction< libMesh::Number, libMesh::Gradient > &old_func, libMesh::ParsedFunction< libMesh::Number, libMesh::Gradient > &new_func)
	When cloning an object, we need to update parameter pointers. More...
virtual void	move_parameter (const libMesh::ParsedFEMFunction< libMesh::Number > &old_func, libMesh::ParsedFEMFunction< libMesh::Number > &new_func)
	When cloning an object, we need to update parameter pointers. More...
virtual void	register_parameter (const std::string &param_name, libMesh::ParameterMultiAccessor< libMesh::Number > &param_pointer) const
	Each subclass will register its copy of an independent. More...

Private Member Functions
	HookesLaw1D ()
void	read_input_options (const GetPot &input)
	Parse properties from input. More...
void	compute_stress_imp (unsigned int dim, const libMesh::TensorValue< libMesh::Real > &g_contra, const libMesh::TensorValue< libMesh::Real > &g_cov, const libMesh::TensorValue< libMesh::Real > &G_contra, const libMesh::TensorValue< libMesh::Real > &G_cov, libMesh::TensorValue< libMesh::Real > &stress)
void	compute_stress_and_elasticity_imp (unsigned int dim, const libMesh::TensorValue< libMesh::Real > &g_contra, const libMesh::TensorValue< libMesh::Real > &g_cov, const libMesh::TensorValue< libMesh::Real > &G_contra, const libMesh::TensorValue< libMesh::Real > &G_cov, libMesh::TensorValue< libMesh::Real > &stress, ElasticityTensor &C)
libMesh::Real	compute_33_stress_imp (const libMesh::TensorValue< libMesh::Real > &g_contra, const libMesh::TensorValue< libMesh::Real > &g_cov, const libMesh::TensorValue< libMesh::Real > &G_contra, const libMesh::TensorValue< libMesh::Real > &G_cov)

Private Attributes
libMesh::Real	_E
	Lam\'{e} constant. More...
libMesh::Real	_nu
	Lam\'{e} constant. More...

Friends
class	StressStrainLaw< HookesLaw1D >

Additional Inherited Members
Static Public Attributes inherited from GRINS::ParameterUser
static std::string	zero_vector_function = std::string("{0}")
	A parseable function string with LIBMESH_DIM components, all 0. More...

Detailed Description

Hooke's law specialized for one-dimensional problems.

General form is not conducive to one-dimensional problems so this should be used in those cases.

Definition at line 43 of file hookes_law_1d.h.

Constructor & Destructor Documentation

GRINS::HookesLaw1D::HookesLaw1D

(

const GetPot &

input

)

Definition at line 39 of file hookes_law_1d.C.

References grins_warning, and read_input_options().

    : StressStrainLaw<HookesLaw1D>(),
    ParameterUser("HookesLaw1D"),
    _E(0.0),
    _nu(0.0)
  {
    // Warning about this constructor being deprecated
    {
      std::string warning = "WARNING: Use of this constructor is DEPRECATED.\n";
      warning += "         Please update to use constructor with input material name.\n";
      grins_warning(warning);
    }

    this->read_input_options(input);

    return;
  }

GRINS::HookesLaw1D::HookesLaw1D	(	const GetPot &	input,
		const std::string &	material
	)

Todo:

we'll need a special accessor to give ParameterUser access to these

Definition at line 57 of file hookes_law_1d.C.

References _E, _nu, GRINS::MaterialsParsing::dep_input_warning(), GRINS::MaterialsParsing::duplicate_input_test(), grins_warning, and GRINS::ParameterUser::set_parameter().

    : StressStrainLaw<HookesLaw1D>(),
    ParameterUser("HookesLaw1D"),
    _E(0.0),
    _nu(0.0)
  {
    MaterialsParsing::duplicate_input_test(input,
                                           "Materials/"+material+"/StressStrainLaw/HookesLaw/lambda",
                                           "Physics/HookesLaw/lambda");
    MaterialsParsing::duplicate_input_test(input,
                                           "Materials/"+material+"/StressStrainLaw/HookesLaw/mu",
                                           "Physics/HookesLaw/mu");
    MaterialsParsing::duplicate_input_test(input,
                                           "Materials/"+material+"/StressStrainLaw/HookesLaw/E",
                                           "Physics/HookesLaw/E");
    MaterialsParsing::duplicate_input_test(input,
                                           "Materials/"+material+"/StressStrainLaw/HookesLaw/nu",
                                           "Physics/HookesLaw/nu");

    // Parse the new version
    if( input.have_variable("Materials/"+material+"/StressStrainLaw/HookesLaw/lambda") &&
        input.have_variable("Materials/"+material+"/StressStrainLaw/HookesLaw/mu") )
      {
        // FIXME - we'll need a special accessor to give parameter
        // access to these
        libMesh::Real lambda  = input("Physics/HookesLaw/lambda", 0.0);
        libMesh::Real mu = input("Physics/HookesLaw/mu", 0.0);
        _E  = mu*(3*lambda + 2*mu)/(lambda+mu);
        _nu = lambda/(2*(lambda+mu));
      }
    else if( input.have_variable("Materials/"+material+"/StressStrainLaw/HookesLaw/E") &&
             input.have_variable("Materials/"+material+"/StressStrainLaw/HookesLaw/nu") )
      {
        this->set_parameter
          (_E, input, "Materials/"+material+"/StressStrainLaw/HookesLaw/E", 0.0);
        this->set_parameter
          (_nu, input, "Materials/"+material+"/StressStrainLaw/HookesLaw/nu", 0.0);
      }
    // Parse the old version
    else if( input.have_variable("Physics/HookesLaw/lambda") &&
             input.have_variable("Physics/HookesLaw/mu") )
      {
        MaterialsParsing::dep_input_warning( "Physics/HookesLaw/lambda",
                                             "StressStrainLaw/HookesLaw/lambda" );
        MaterialsParsing::dep_input_warning( "Physics/HookesLaw/mu",
                                             "StressStrainLaw/HookesLaw/mu" );

        libMesh::Real lambda  = input("Physics/HookesLaw/lambda", 0.0);
        libMesh::Real mu = input("Physics/HookesLaw/mu", 0.0);
        _E  = mu*(3*lambda + 2*mu)/(lambda+mu);
        _nu = lambda/(2*(lambda+mu));
      }
    else if( input.have_variable("Physics/HookesLaw/E") &&
             input.have_variable("Physics/HookesLaw/nu") )
      {
        MaterialsParsing::dep_input_warning( "Physics/HookesLaw/E",
                                             "StressStrainLaw/HookesLaw/E" );
        MaterialsParsing::dep_input_warning( "Physics/HookesLaw/nu",
                                             "StressStrainLaw/HookesLaw/nu" );

        this->set_parameter(_E, input, "Physics/HookesLaw/E", 0.0);
        this->set_parameter(_nu, input, "Physics/HookesLaw/nu", 0.0);
      }
    else
      {
        libmesh_error_msg("ERROR: Could not find consistent HookesLaw input!");
      }

    // mu should be positive
    if( _E <= 0.0 )
      libmesh_error_msg("ERROR: Detected non-positive Young's modulus!");

    // Technically, Poisson's ratio can be negative, but it's weird. Let's warn about it.
    if( _nu < 0.0 )
      {
        std::string warning = "WARNING: Detected non-positive Poisson's ratio";
        grins_warning(warning);
      }
  }

GRINS::HookesLaw1D::~HookesLaw1D ( )

virtual

Definition at line 138 of file hookes_law_1d.C.

  {
    return;
  }

GRINS::HookesLaw1D::HookesLaw1D ( )

private

Member Function Documentation

libMesh::Real GRINS::HookesLaw1D::compute_33_stress_imp ( const libMesh::TensorValue< libMesh::Real > &  g_contra, const libMesh::TensorValue< libMesh::Real > &  g_cov, const libMesh::TensorValue< libMesh::Real > &  G_contra, const libMesh::TensorValue< libMesh::Real > &  G_cov  )

private

Definition at line 209 of file hookes_law_1d.C.

  {
    libmesh_not_implemented();

    return 0.0;
  }

void GRINS::HookesLaw1D::compute_stress_and_elasticity_imp ( unsigned int  dim, const libMesh::TensorValue< libMesh::Real > &  g_contra, const libMesh::TensorValue< libMesh::Real > &  g_cov, const libMesh::TensorValue< libMesh::Real > &  G_contra, const libMesh::TensorValue< libMesh::Real > &  G_cov, libMesh::TensorValue< libMesh::Real > &  stress, ElasticityTensor &  C  )

private

Definition at line 194 of file hookes_law_1d.C.

References _E, and compute_stress_imp().

  {
    this->compute_stress_imp(dim,g_contra,g_cov,G_contra,G_cov,stress);

    C(0,0,0,0) = this->_E*g_contra(0,0)*g_contra(0,0);

    return;
  }

void GRINS::HookesLaw1D::compute_stress_imp ( unsigned int  dim, const libMesh::TensorValue< libMesh::Real > &  g_contra, const libMesh::TensorValue< libMesh::Real > &  g_cov, const libMesh::TensorValue< libMesh::Real > &  G_contra, const libMesh::TensorValue< libMesh::Real > &  G_cov, libMesh::TensorValue< libMesh::Real > &  stress  )

private

Definition at line 178 of file hookes_law_1d.C.

References _E.

Referenced by compute_stress_and_elasticity_imp().

  {
    stress.zero();

    libMesh::Real strain = 0.5*(G_cov(0,0) - g_cov(0,0));

    stress(0,0) = (this->_E)*g_contra(0,0)*g_contra(0,0)*strain;

    return;
  }

void GRINS::HookesLaw1D::read_input_options ( const GetPot &  input )

private

Parse properties from input.

Definition at line 143 of file hookes_law_1d.C.

References _E, _nu, and GRINS::ParameterUser::set_parameter().

Referenced by HookesLaw1D().

  {
    // We'd better have either Lam\'{e} constants or E and nu
    if( ( !input.have_variable("Physics/HookesLaw/lambda") ||
          !input.have_variable("Physics/HookesLaw/mu") ) &&
        ( !input.have_variable("Physics/HookesLaw/E") ||
          !input.have_variable("Physics/HookesLaw/nu") ) )
      {
        std::cerr << "Error: Must specify either Lame constants lambda and mu or" << std::endl
                  << "       Young's modulus and Poisson's ratio." << std::endl;
        libmesh_error();
      }

    if( input.have_variable("Physics/HookesLaw/lambda") &&
        input.have_variable("Physics/HookesLaw/mu") )
      {
        // FIXME - we'll need a special accessor to give parameter
        // access to these
        libMesh::Real lambda  = input("Physics/HookesLaw/lambda", 0.0);
        libMesh::Real mu = input("Physics/HookesLaw/mu", 0.0);
        _E  = mu*(3*lambda + 2*mu)/(lambda+mu);
        _nu = lambda/(2*(lambda+mu));
      }
    else
      {
        if( input.have_variable("Physics/HookesLaw/E") )
          this->set_parameter
            (_E, input, "Physics/HookesLaw/E", 0.0);

        if( input.have_variable("Physics/HookesLaw/nu") )
          this->set_parameter
            (_nu, input, "Physics/HookesLaw/nu", 0.0);
      }
  }

Friends And Related Function Documentation

friend class StressStrainLaw< HookesLaw1D >

friend

Definition at line 55 of file hookes_law_1d.h.

Member Data Documentation

libMesh::Real GRINS::HookesLaw1D::_E

private

Lam\'{e} constant.

Definition at line 85 of file hookes_law_1d.h.

Referenced by compute_stress_and_elasticity_imp(), compute_stress_imp(), HookesLaw1D(), and read_input_options().

libMesh::Real GRINS::HookesLaw1D::_nu

private

Lam\'{e} constant.

Definition at line 88 of file hookes_law_1d.h.

Referenced by HookesLaw1D(), and read_input_options().

---

The documentation for this class was generated from the following files:

• src/properties/include/grins/hookes_law_1d.h
• src/properties/src/hookes_law_1d.C