Description

Base interface for damping of thin shells (Kirchoff-Love shell theory, without shear effects) to be used in a ChMaterialShellKirchhoff.

Children classes should implement a ComputeStress function that returns generalized stresses given time derivatives of strains as: {n,m}=f({e',k'})

#include <ChMaterialShellKirchhoff.h>

Inheritance diagram for chrono::fea::ChDampingKirchhoff:

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Collaboration diagram for chrono::fea::ChDampingKirchhoff:

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Public Member Functions
virtual void	ComputeStress (ChVector3d &n, ChVector3d &m, const ChVector3d &deps, const ChVector3d &dkur, const double z_inf, const double z_sup, const double angle)=0
	Compute the generalized cut force and cut torque, caused by structural damping, given actual deformation speed and curvature speed. More...

virtual void	ComputeDampingMatrix (ChMatrixRef R, const ChVector3d &deps, const ChVector3d &dkur, const double z_inf, const double z_sup, const double angle)
	Compute the 6x6 tangent material damping matrix, ie the jacobian [Rm]=dstress/dstrainspeed. More...

Public Attributes
ChMaterialShellKirchhoff *	section

Member Function Documentation

◆ ComputeDampingMatrix()

void chrono::fea::ChDampingKirchhoff::ComputeDampingMatrix	(	ChMatrixRef	R,
		const ChVector3d &	deps,
		const ChVector3d &	dkur,
		const double	z_inf,
		const double	z_sup,
		const double	angle
	)

virtual

Compute the 6x6 tangent material damping matrix, ie the jacobian [Rm]=dstress/dstrainspeed.

This must be overridden by subclasses if an analytical solution is known (preferred for high performance), otherwise the base behaviour here is to compute [Rm] by numerical differentiation calling ComputeStress() multiple times.

Parameters

R	6x6 material damping matrix values here
deps	time derivative of strains de_11/dt, de_22/dt, de_12/dt
dkur	time derivative of curvature dk_11/dt, dk_22/dt, dk_12/dt
z_inf	layer lower z value (along thickness coord)
z_sup	layer upper z value (along thickness coord)
angle	layer angle respect to x (if needed) -not used in this, isotropic

Reimplemented in chrono::fea::ChDampingKirchhoffRayleigh.

◆ ComputeStress()

virtual void chrono::fea::ChDampingKirchhoff::ComputeStress	(	ChVector3d &	n,
		ChVector3d &	m,
		const ChVector3d &	deps,
		const ChVector3d &	dkur,
		const double	z_inf,
		const double	z_sup,
		const double	angle
	)

pure virtual

Compute the generalized cut force and cut torque, caused by structural damping, given actual deformation speed and curvature speed.

This MUST be implemented by subclasses.

Parameters

n	forces n_11, n_22, n_12 (per unit length)
m	torques m_11, m_22, m_12 (per unit length)
deps	time derivative of strains de_11/dt, de_22/dt, de_12/dt
dkur	time derivative of curvature dk_11/dt, dk_22/dt, dk_12/dt
z_inf	layer lower z value (along thickness coord)
z_sup	layer upper z value (along thickness coord)
angle	layer angle respect to x (if needed)

Implemented in chrono::fea::ChDampingKirchhoffRayleigh.

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

/builds/uwsbel/chrono/src/chrono/fea/ChMaterialShellKirchhoff.h
/builds/uwsbel/chrono/src/chrono/fea/ChMaterialShellKirchhoff.cpp

Description

Public Member Functions

Public Attributes

Member Function Documentation

◆ ComputeDampingMatrix()

◆ ComputeStress()