TrussMaterial Class Reference

#include <TrussMaterial.h>

Inheritance diagram for TrussMaterial:

Public Member Functions
	TrussMaterial (const InputParameters &parameters)

Static Public Member Functions
static InputParameters	validParams ()

Protected Member Functions
virtual void	initQpStatefulProperties ()
virtual void	computeProperties ()
virtual void	computeQpStrain ()=0
virtual void	computeQpStress ()=0

Protected Attributes
std::vector< MooseVariable * >	_disp_var
const std::string	_base_name
unsigned int	_ndisp
const VariableValue &	_youngs_modulus
MaterialProperty< Real > &	_total_stretch
MaterialProperty< Real > &	_elastic_stretch
MaterialProperty< Real > &	_axial_stress
MaterialProperty< Real > &	_e_over_l
Real	_origin_length
Real	_current_length

Detailed Description

Definition at line 20 of file TrussMaterial.h.

Constructor & Destructor Documentation

TrussMaterial()

TrussMaterial::TrussMaterial

(

const InputParameters &

parameters

)

Definition at line 37 of file TrussMaterial.C.

  : Material(parameters),
    _base_name(isParamValid("base_name") ? getParam<std::string>("base_name") + "_" : ""),
    _youngs_modulus(coupledValue("youngs_modulus")),
    _total_stretch(declareProperty<Real>(_base_name + "total_stretch")),
    _elastic_stretch(declareProperty<Real>(_base_name + "elastic_stretch")),
    _axial_stress(declareProperty<Real>(_base_name + "axial_stress")),
    _e_over_l(declareProperty<Real>(_base_name + "e_over_l"))
{
  const std::vector<VariableName> & nl_vnames(getParam<std::vector<VariableName>>("displacements"));
  _ndisp = nl_vnames.size();
 
  // fetch nonlinear variables
  for (unsigned int i = 0; i < _ndisp; ++i)
    _disp_var.push_back(&_fe_problem.getStandardVariable(_tid, nl_vnames[i]));
}

Member Function Documentation

computeProperties()

void TrussMaterial::computeProperties ( )

protectedvirtual

Definition at line 63 of file TrussMaterial.C.

{
  // check for consistency of the number of element nodes
  mooseAssert(_current_elem->n_nodes() == 2, "Truss element needs to have exactly two nodes.");
 
  // fetch the two end nodes for _current_elem
  std::vector<const Node *> node;
  for (unsigned int i = 0; i < 2; ++i)
    node.push_back(_current_elem->node_ptr(i));
 
  // calculate original length of a truss element
  RealGradient dxyz;
  for (unsigned int i = 0; i < _ndisp; ++i)
    dxyz(i) = (*node[1])(i) - (*node[0])(i);
  _origin_length = dxyz.norm();
 
  // fetch the solution for the two end nodes
  NonlinearSystemBase & nonlinear_sys = _fe_problem.getNonlinearSystemBase();
  const NumericVector<Number> & sol = *nonlinear_sys.currentSolution();
 
  std::vector<Real> disp0, disp1;
  for (unsigned int i = 0; i < _ndisp; ++i)
  {
    disp0.push_back(sol(node[0]->dof_number(nonlinear_sys.number(), _disp_var[i]->number(), 0)));
    disp1.push_back(sol(node[1]->dof_number(nonlinear_sys.number(), _disp_var[i]->number(), 0)));
  }
 
  // calculate current length of a truss element
  for (unsigned int i = 0; i < _ndisp; ++i)
    dxyz(i) += disp1[i] - disp0[i];
  _current_length = dxyz.norm();
 
  for (_qp = 0; _qp < _qrule->n_points(); ++_qp)
  {
    _e_over_l[_qp] = _youngs_modulus[_qp] / _origin_length;
 
    computeQpStrain();
    computeQpStress();
  }
}

computeQpStrain()

virtual void TrussMaterial::computeQpStrain ( )

protectedpure virtual

Implemented in LinearElasticTruss, and PlasticTruss.

Referenced by computeProperties().

computeQpStress()

virtual void TrussMaterial::computeQpStress ( )

protectedpure virtual

Implemented in LinearElasticTruss, and PlasticTruss.

Referenced by computeProperties().

initQpStatefulProperties()

void TrussMaterial::initQpStatefulProperties ( )

protectedvirtual

Reimplemented in PlasticTruss.

Definition at line 55 of file TrussMaterial.C.

{
  _axial_stress[_qp] = 0.0;
  _total_stretch[_qp] = 0.0;
  _elastic_stretch[_qp] = 0.0;
}

Referenced by PlasticTruss::initQpStatefulProperties().

validParams()

InputParameters TrussMaterial::validParams ( )

static

Definition at line 23 of file TrussMaterial.C.

{
  InputParameters params = Material::validParams();
  params.addParam<std::string>("base_name",
                               "Optional parameter that allows the user to define "
                               "multiple mechanics material systems on the same "
                               "block, i.e. for multiple phases");
  params.addRequiredParam<std::vector<VariableName>>(
      "displacements",
      "The displacements appropriate for the simulation geometry and coordinate system");
  params.addCoupledVar("youngs_modulus", "Variable containing Young's modulus");
  return params;
}

Referenced by LinearElasticTruss::validParams().

Member Data Documentation

_axial_stress

MaterialProperty<Real>& TrussMaterial::_axial_stress

protected

Definition at line 43 of file TrussMaterial.h.

Referenced by LinearElasticTruss::computeQpStress(), PlasticTruss::computeQpStress(), and initQpStatefulProperties().

_base_name

const std::string TrussMaterial::_base_name

protected

Definition at line 36 of file TrussMaterial.h.

_current_length

Real TrussMaterial::_current_length

protected

Definition at line 47 of file TrussMaterial.h.

Referenced by computeProperties(), LinearElasticTruss::computeQpStrain(), and PlasticTruss::computeQpStrain().

_disp_var

std::vector<MooseVariable *> TrussMaterial::_disp_var

protected

Definition at line 34 of file TrussMaterial.h.

Referenced by computeProperties(), and TrussMaterial().

_e_over_l

MaterialProperty<Real>& TrussMaterial::_e_over_l

protected

Definition at line 44 of file TrussMaterial.h.

Referenced by computeProperties().

_elastic_stretch

MaterialProperty<Real>& TrussMaterial::_elastic_stretch

protected

Definition at line 42 of file TrussMaterial.h.

Referenced by LinearElasticTruss::computeQpStrain(), LinearElasticTruss::computeQpStress(), PlasticTruss::computeQpStress(), and initQpStatefulProperties().

_ndisp

unsigned int TrussMaterial::_ndisp

protected

Definition at line 38 of file TrussMaterial.h.

Referenced by computeProperties(), and TrussMaterial().

_origin_length

Real TrussMaterial::_origin_length

protected

Definition at line 46 of file TrussMaterial.h.

Referenced by computeProperties(), LinearElasticTruss::computeQpStrain(), and PlasticTruss::computeQpStrain().

_total_stretch

MaterialProperty<Real>& TrussMaterial::_total_stretch

protected

Definition at line 41 of file TrussMaterial.h.

Referenced by LinearElasticTruss::computeQpStrain(), PlasticTruss::computeQpStrain(), PlasticTruss::computeQpStress(), and initQpStatefulProperties().

_youngs_modulus

const VariableValue& TrussMaterial::_youngs_modulus

protected

Definition at line 39 of file TrussMaterial.h.

Referenced by computeProperties(), LinearElasticTruss::computeQpStress(), and PlasticTruss::computeQpStress().

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

• tensor_mechanics/include/materials/TrussMaterial.h
• tensor_mechanics/src/materials/TrussMaterial.C