Public Member Functions | Public Attributes | List of all members
chrono::fea::ChPlasticityCosserat Class Referenceabstract
Chrono::Engine » Finite Element Analysis » Utility classes

Description

Base class for plasticity of beam sections of Cosserat type.

This can be shared between multiple beams.

#include <ChBeamSectionCosserat.h>

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Public Member Functions

virtual bool ComputeStressWithReturnMapping (ChVector<> &stress_n, ChVector<> &stress_m, ChVector<> &e_strain_e_new, ChVector<> &e_strain_k_new, ChBeamMaterialInternalData &data_new, const ChVector<> &tot_strain_e, const ChVector<> &tot_strain_k, const ChBeamMaterialInternalData &data)=0
 
virtual void ComputeStiffnessMatrixElastoplastic (ChMatrixNM< double, 6, 6 > &K, const ChVector<> &strain_e, const ChVector<> &strain_k, const ChBeamMaterialInternalData &data)
 Compute the 6x6 tangent material stiffness matrix [Km] = dσ/dε, given actual internal data and deformation and curvature (if needed). More...
 
virtual void CreatePlasticityData (int numpoints, std::vector< std::unique_ptr< ChBeamMaterialInternalData >> &plastic_data)
 

Public Attributes

ChBeamSectionCosserat * section
 
double nr_yeld_tolerance
 
int nr_yeld_maxiters
 

Member Function Documentation

◆ ComputeStiffnessMatrixElastoplastic()

void chrono::fea::ChPlasticityCosserat::ComputeStiffnessMatrixElastoplastic ( ChMatrixNM< double, 6, 6 > &  K,
const ChVector<> &  strain_e,
const ChVector<> &  strain_k,
const ChBeamMaterialInternalData &  data 
)
virtual

Compute the 6x6 tangent material stiffness matrix [Km] = dσ/dε, given actual internal data and deformation and curvature (if needed).

If in plastic regime, uses elastoplastic matrix, otherwise uses elastic. This must be overridden by subclasses if an analytical solution is known (preferred for high performance), otherwise the base behaviour here is to compute [Km] by numerical differentiation calling ComputeStressWithReturnMapping() multiple times.

Parameters
K6x6 material stiffness matrix values here
strain_etot strain (deformation part): x= elongation, y and z are shear
strain_ktot strain (curvature part), x= torsion, y and z are line curvatures
dataupdated material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}

◆ ComputeStressWithReturnMapping()

virtual bool chrono::fea::ChPlasticityCosserat::ComputeStressWithReturnMapping ( ChVector<> &  stress_n,
ChVector<> &  stress_m,
ChVector<> &  e_strain_e_new,
ChVector<> &  e_strain_k_new,
ChBeamMaterialInternalData &  data_new,
const ChVector<> &  tot_strain_e,
const ChVector<> &  tot_strain_k,
const ChBeamMaterialInternalData &  data 
)
pure virtual
Parameters
stress_nlocal stress (generalized force), x component = traction along beam
stress_mlocal stress (generalized torque), x component = torsion torque along beam
e_strain_e_newupdated elastic strain (deformation part)
e_strain_k_newupdated elastic strain (curvature part)
data_newupdated material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}
tot_strain_etrial tot strain (deformation part): x= elongation, y and z are shear
tot_strain_ktrial tot strain (curvature part), x= torsion, y and z are line curvatures
datatrial material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}

Implemented in chrono::fea::ChPlasticityCosseratLumped.

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