Description

Base class for properties of beam sections of Cosserat type (with shear too).

A beam section can be shared between multiple beams. A beam section contains the models for elasticity, plasticity, damping, etc.

#include <ChBeamSectionCosserat.h>

Inheritance diagram for chrono::fea::ChBeamSectionCosserat:

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Collaboration diagram for chrono::fea::ChBeamSectionCosserat:

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Public Member Functions
	ChBeamSectionCosserat (std::shared_ptr< ChElasticityCosserat > melasticity)

	ChBeamSectionCosserat (std::shared_ptr< ChElasticityCosserat > melasticity, std::shared_ptr< ChPlasticityCosserat > mplasticity)

	ChBeamSectionCosserat (std::shared_ptr< ChElasticityCosserat > melasticity, std::shared_ptr< ChPlasticityCosserat > mplasticity, std::shared_ptr< ChDampingCosserat > mdamping)

virtual void	ComputeStress (ChVector<> &stress_n, ChVector<> &stress_m, const ChVector<> &strain_e, const ChVector<> &strain_k, ChBeamMaterialInternalData mdata_new=nullptr, const ChBeamMaterialInternalData 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: {F,M}=f({e,k}), and given the actual material state required for plasticity if any (but if mdata=nullptr, computes only the elastic force). More...

virtual void	ComputeStiffnessMatrix (ChMatrixDynamic<> &K, const ChVector<> &strain_e, const ChVector<> &strain_k, const ChBeamMaterialInternalData *mdata=nullptr)
	Compute the 6x6 tangent material stiffness matrix [Km] = dσ/dε 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< ChElasticityCosserat > melasticity)
	Set the elasticity model for this section. More...

std::shared_ptr< ChElasticityCosserat >	GetElasticity ()
	Get the elasticity model for this section. More...

void	SetPlasticity (std::shared_ptr< ChPlasticityCosserat > mplasticity)
	Set the plasticity model for this section. More...

std::shared_ptr< ChPlasticityCosserat >	GetPlasticity ()
	Get the elasticity model for this section, if any. More...

void	SetDamping (std::shared_ptr< ChDampingCosserat > mdamping)
	Set the damping model for this section. More...

std::shared_ptr< ChDampingCosserat >	GetDamping ()
	Get the damping model for this section. More...

virtual void	SetAsRectangularSection (double width_y, double width_z) override
	Shortcut: set elastic and plastic constants at once, given the y and z widths of the beam assumed with rectangular shape.

virtual void	SetAsCircularSection (double diameter) override
	Shortcut: set elastic and plastic constants at once, given the diameter of the beam assumed with circular shape.

Public Member Functions inherited from chrono::fea::ChBeamSectionProperties
void	SetDrawThickness (double thickness_y, double thickness_z)
	Sets the rectangular thickness of the beam on y and z directions, only for drawing/rendering purposes (these thickness values do NOT have any meaning at a physical level, use SetAsRectangularSection()

double	GetDrawThicknessY ()

double	GetDrawThicknessZ ()

bool	IsCircular ()
	Tells if the section must be drawn as a circular section instead than default rectangular.

void	SetCircular (bool ic)
	Set if the section must be drawn as a circular section instead than default rectangular.

void	SetDrawCircularRadius (double draw_rad)
	Sets the radius of the beam if in 'circular section' draw mode, only for drawing/rendering purposes (this radius value do NOT have any meaning at a physical level, use ChBeamSectionBasic::SetAsCircularSection()

double	GetDrawCircularRadius ()

void	SetArea (const double ma)
	Set the cross sectional area A of the beam (m^2)

double	GetArea () const

void	SetDensity (double md)
	Set the density of the beam (kg/m^3)

double	GetDensity () const

Additional Inherited Members
Public Attributes inherited from chrono::fea::ChBeamSectionProperties
double	y_drawsize

double	z_drawsize

bool	is_circular

double	Area

double	density

Constructor & Destructor Documentation

◆ ChBeamSectionCosserat() [1/3]

chrono::fea::ChBeamSectionCosserat::ChBeamSectionCosserat ( std::shared_ptr< ChElasticityCosserat > melasticity )

Parameters

melasticity elasticity model for this section

◆ ChBeamSectionCosserat() [2/3]

chrono::fea::ChBeamSectionCosserat::ChBeamSectionCosserat	(	std::shared_ptr< ChElasticityCosserat >	melasticity,
		std::shared_ptr< ChPlasticityCosserat >	mplasticity
	)

Parameters

melasticity	elasticity model for this section
mplasticity	plasticity model for this section, if any

◆ ChBeamSectionCosserat() [3/3]

chrono::fea::ChBeamSectionCosserat::ChBeamSectionCosserat	(	std::shared_ptr< ChElasticityCosserat >	melasticity,
		std::shared_ptr< ChPlasticityCosserat >	mplasticity,
		std::shared_ptr< ChDampingCosserat >	mdamping
	)

Parameters

melasticity	elasticity model for this section
mplasticity	plasticity model for this section, if any
mdamping	damping model for this section, if any

Member Function Documentation

◆ ComputeStiffnessMatrix()

void chrono::fea::ChBeamSectionCosserat::ComputeStiffnessMatrix	(	ChMatrixDynamic<> &	K,
		const ChVector<> &	strain_e,
		const ChVector<> &	strain_k,
		const ChBeamMaterialInternalData *	mdata = `nullptr`
	)

virtual

Compute the 6x6 tangent material stiffness matrix [Km] = dσ/dε 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

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

◆ ComputeStress()

void chrono::fea::ChBeamSectionCosserat::ComputeStress	(	ChVector<> &	stress_n,
		ChVector<> &	stress_m,
		const ChVector<> &	strain_e,
		const ChVector<> &	strain_k,
		ChBeamMaterialInternalData *	mdata_new = `nullptr`,
		const ChBeamMaterialInternalData *	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: {F,M}=f({e,k}), 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

stress_n	stress (generalized force F), x component = traction along beam
stress_m	stress (generalized torque M), x component = torsion torque along beam
strain_e	strain (deformation part e): x= elongation, y and z are shear
strain_k	strain (curvature part k), x= torsion, y and z are line curvatures
mdata_new	updated material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}
mdata	current material internal variables, at this point, including {p_strain_e, p_strain_k, p_strain_acc}

◆ GetDamping()

std::shared_ptr<ChDampingCosserat> chrono::fea::ChBeamSectionCosserat::GetDamping ( )

inline

Get the damping model for this section.

By default no damping.

◆ GetElasticity()

std::shared_ptr<ChElasticityCosserat> chrono::fea::ChBeamSectionCosserat::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<ChPlasticityCosserat> chrono::fea::ChBeamSectionCosserat::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::ChBeamSectionCosserat::SetDamping ( std::shared_ptr< ChDampingCosserat > mdamping )

Set the damping model for this section.

By default no damping.

◆ SetElasticity()

void chrono::fea::ChBeamSectionCosserat::SetElasticity ( std::shared_ptr< ChElasticityCosserat > 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::ChBeamSectionCosserat::SetPlasticity ( std::shared_ptr< ChPlasticityCosserat > 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/ChBeamSectionCosserat.h
/builds/uwsbel/chrono/src/chrono/fea/ChBeamSectionCosserat.cpp

Description

Public Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ ChBeamSectionCosserat() [1/3]

◆ ChBeamSectionCosserat() [2/3]

◆ ChBeamSectionCosserat() [3/3]

Member Function Documentation

◆ ComputeStiffnessMatrix()

◆ ComputeStress()

◆ GetDamping()

◆ GetElasticity()

◆ GetPlasticity()

◆ SetDamping()

◆ SetElasticity()

◆ SetPlasticity()