chrono::fea::ChMaterialShellReissner Class Reference

Description

Material for a single layer of a 6-field Reissner-Mindlin shells (kinematically-exact shell theory as in Witkowski et al).

This base implementation assumes that one creates a ChMaterialShellReissner by providing three components:

Thickness is defined when adding a ChMaterialShellReissner material as a layer in a shell finite element (ex. ChElementShellReissner4). A material can be shared between multiple layers.

#include <ChMaterialShellReissner.h>

Inheritance diagram for chrono::fea::ChMaterialShellReissner:

Public Member Functions

 ChMaterialShellReissner (std::shared_ptr< ChElasticityReissner > melasticity)
 
 ChMaterialShellReissner (std::shared_ptr< ChElasticityReissner > melasticity, std::shared_ptr< ChPlasticityReissner > mplasticity)
 
 ChMaterialShellReissner (std::shared_ptr< ChElasticityReissner > melasticity, std::shared_ptr< ChPlasticityReissner > mplasticity, std::shared_ptr< ChDampingReissner > mdamping)
 
virtual void ComputeStress (ChVector<> &n_u, ChVector<> &n_v, ChVector<> &m_u, ChVector<> &m_v, const ChVector<> &eps_u, const ChVector<> &eps_v, const ChVector<> &kur_u, const ChVector<> &kur_v, const double z_inf, const double z_sup, const double angle, ChShellReissnerInternalData *mdata_new=nullptr, const ChShellReissnerInternalData *mdata=nullptr)
 Compute the generalized cut force and cut torque, given the actual generalized section strain expressed as deformation vector e and curvature k, that is: {n_u,n_v,m_u,m_v}=f({e_u,e_v,k_u,k_v}), and given the actual material state required for plasticity if any (but if mdata=nullptr, computes only the elastic force). More...
 
virtual void ComputeStiffnessMatrix (ChMatrixRef K, const ChVector<> &eps_u, const ChVector<> &eps_v, const ChVector<> &kur_u, const ChVector<> &kur_v, const double z_inf, const double z_sup, const double angle, const ChShellReissnerInternalData *mdata=nullptr)
 Compute the 6x6 tangent material stiffness matrix [Km] = dσ/dε at a given strain state, and at given internal data state (if mdata=nullptr, computes only the elastic tangent stiffenss, regardless of plasticity). More...
 
void SetElasticity (std::shared_ptr< ChElasticityReissner > melasticity)
 Set the elasticity model for this section. More...
 
std::shared_ptr< ChElasticityReissnerGetElasticity ()
 Get the elasticity model for this section. More...
 
void SetPlasticity (std::shared_ptr< ChPlasticityReissner > mplasticity)
 Set the plasticity model for this section. More...
 
std::shared_ptr< ChPlasticityReissnerGetPlasticity ()
 Get the elasticity model for this section, if any. More...
 
void SetDamping (std::shared_ptr< ChDampingReissner > mdamping)
 Set the damping model for this section. More...
 
std::shared_ptr< ChDampingReissnerGetDamping ()
 Get the damping model for this section. More...
 
void SetDensity (double md)
 Set the density of the shell (kg/m^3)
 
double GetDensity () const
 
double Get_rho () const
 for backward compatibility - use GetDensity instead
 

Constructor & Destructor Documentation

◆ ChMaterialShellReissner() [1/3]

chrono::fea::ChMaterialShellReissner::ChMaterialShellReissner ( std::shared_ptr< ChElasticityReissner melasticity)
Parameters
melasticityelasticity model

◆ ChMaterialShellReissner() [2/3]

chrono::fea::ChMaterialShellReissner::ChMaterialShellReissner ( std::shared_ptr< ChElasticityReissner melasticity,
std::shared_ptr< ChPlasticityReissner mplasticity 
)
Parameters
melasticityelasticity model
mplasticityplasticity model, if any

◆ ChMaterialShellReissner() [3/3]

chrono::fea::ChMaterialShellReissner::ChMaterialShellReissner ( std::shared_ptr< ChElasticityReissner melasticity,
std::shared_ptr< ChPlasticityReissner mplasticity,
std::shared_ptr< ChDampingReissner mdamping 
)
Parameters
melasticityelasticity model
mplasticityplasticity model, if any
mdampingdamping model, if any

Member Function Documentation

◆ ComputeStiffnessMatrix()

void chrono::fea::ChMaterialShellReissner::ComputeStiffnessMatrix ( ChMatrixRef  K,
const ChVector<> &  eps_u,
const ChVector<> &  eps_v,
const ChVector<> &  kur_u,
const ChVector<> &  kur_v,
const double  z_inf,
const double  z_sup,
const double  angle,
const ChShellReissnerInternalData mdata = nullptr 
)
virtual

Compute the 6x6 tangent material stiffness matrix [Km] = dσ/dε at a given strain state, and at given internal data state (if mdata=nullptr, computes only the elastic tangent stiffenss, regardless of plasticity).

Parameters
K12x12 stiffness matrix
eps_ustrains along u direction
eps_vstrains along v direction
kur_ucurvature along u direction
kur_vcurvature along v direction
z_inflayer lower z value (along thickness coord)
z_suplayer upper z value (along thickness coord)
anglelayer angle respect to x (if needed)
mdatamaterial internal variables, at this point, if any, including {p_strain_e, p_strain_k, p_strain_acc}

◆ ComputeStress()

void chrono::fea::ChMaterialShellReissner::ComputeStress ( ChVector<> &  n_u,
ChVector<> &  n_v,
ChVector<> &  m_u,
ChVector<> &  m_v,
const ChVector<> &  eps_u,
const ChVector<> &  eps_v,
const ChVector<> &  kur_u,
const ChVector<> &  kur_v,
const double  z_inf,
const double  z_sup,
const double  angle,
ChShellReissnerInternalData mdata_new = nullptr,
const ChShellReissnerInternalData mdata = nullptr 
)
virtual

Compute the generalized cut force and cut torque, given the actual generalized section strain expressed as deformation vector e and curvature k, that is: {n_u,n_v,m_u,m_v}=f({e_u,e_v,k_u,k_v}), and given the actual material state required for plasticity if any (but if mdata=nullptr, computes only the elastic force).

If there is plasticity, the stress is clamped by automatically performing an implicit return mapping. In sake of generality, if possible this is the function that should be used by beam finite elements to compute internal forces, ex.by some Gauss quadrature.

Parameters
n_uforces along u direction (per unit length)
n_vforces along v direction (per unit length)
m_utorques along u direction (per unit length)
m_vtorques along v direction (per unit length)
eps_ustrains along u direction
eps_vstrains along v direction
kur_ucurvature along u direction
kur_vcurvature along v direction
z_inflayer lower z value (along thickness coord)
z_suplayer upper z value (along thickness coord)
anglelayer angle respect to x (if needed)
mdata_newupdated material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}
mdatacurrent material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}

◆ GetDamping()

std::shared_ptr<ChDampingReissner> chrono::fea::ChMaterialShellReissner::GetDamping ( )
inline

Get the damping model for this section.

By default no damping.

◆ GetElasticity()

std::shared_ptr<ChElasticityReissner> chrono::fea::ChMaterialShellReissner::GetElasticity ( )
inline

Get the elasticity model for this section.

Use this function to access parameters such as stiffness, Young modulus, etc. By default it uses a simple centered linear elastic model.

◆ GetPlasticity()

std::shared_ptr<ChPlasticityReissner> chrono::fea::ChMaterialShellReissner::GetPlasticity ( )
inline

Get the elasticity model for this section, if any.

Use this function to access parameters such as yeld limit, etc.

◆ SetDamping()

void chrono::fea::ChMaterialShellReissner::SetDamping ( std::shared_ptr< ChDampingReissner mdamping)

Set the damping model for this section.

By default no damping.

◆ SetElasticity()

void chrono::fea::ChMaterialShellReissner::SetElasticity ( std::shared_ptr< ChElasticityReissner melasticity)

Set the elasticity model for this section.

By default it uses a simple centered linear elastic model, but you can set more complex models.

◆ SetPlasticity()

void chrono::fea::ChMaterialShellReissner::SetPlasticity ( std::shared_ptr< ChPlasticityReissner mplasticity)

Set the plasticity model for this section.

This is independent from the elasticity model. Note that by default there is no plasticity model, so by default plasticity never happens.


The documentation for this class was generated from the following files:
  • /builds/uwsbel/chrono/src/chrono/fea/ChMaterialShellReissner.h
  • /builds/uwsbel/chrono/src/chrono/fea/ChMaterialShellReissner.cpp