chrono::fea::ChPlasticityCosserat Class Reference

Description

Base class for plasticity of beam sections of Cosserat type.

This can be shared between multiple beams.

#include <ChBeamSectionCosserat.h>

Inheritance diagram for chrono::fea::ChPlasticityCosserat:

Collaboration diagram for chrono::fea::ChPlasticityCosserat:

Public Member Functions
virtual bool	ComputeStressWithReturnMapping (ChVector3d &stress_n, ChVector3d &stress_m, ChVector3d &e_strain_e_new, ChVector3d &e_strain_k_new, ChBeamMaterialInternalData &data_new, const ChVector3d &tot_strain_e, const ChVector3d &tot_strain_k, const ChBeamMaterialInternalData &data)=0
virtual void	ComputeStiffnessMatrixElastoplastic (ChMatrix66d &K, const ChVector3d &strain_e, const ChVector3d &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 ( ChMatrix66d &  K, const ChVector3d &  strain_e, const ChVector3d &  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

K	6x6 material stiffness matrix values here
strain_e	tot strain (deformation part): x= elongation, y and z are shear
strain_k	tot strain (curvature part), x= torsion, y and z are line curvatures
data	updated material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}

ComputeStressWithReturnMapping()

virtual bool chrono::fea::ChPlasticityCosserat::ComputeStressWithReturnMapping ( ChVector3d &  stress_n, ChVector3d &  stress_m, ChVector3d &  e_strain_e_new, ChVector3d &  e_strain_k_new, ChBeamMaterialInternalData &  data_new, const ChVector3d &  tot_strain_e, const ChVector3d &  tot_strain_k, const ChBeamMaterialInternalData &  data  )

pure virtual

Parameters

stress_n	local stress (generalized force), x component = traction along beam
stress_m	local stress (generalized torque), x component = torsion torque along beam
e_strain_e_new	updated elastic strain (deformation part)
e_strain_k_new	updated elastic strain (curvature part)
data_new	updated material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}
tot_strain_e	trial tot strain (deformation part): x= elongation, y and z are shear
tot_strain_k	trial tot strain (curvature part), x= torsion, y and z are line curvatures
data	trial material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}

Implemented in chrono::fea::ChPlasticityCosseratLumped.

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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