Description

Base interface for damping of 6-field Reissner-Mindlin shells (kinematically-exact shell theory as in Witkowski et al.) to be used in a ChMaterialShellReissner.

Children classes should implement a ComputeStress function that returns generalized stresses given time derivatives of strains as: {n_u,n_v,m_u.m_v}=f({e_u',e_v',k_u',k_v'})

#include <ChMaterialShellReissner.h>

Inheritance diagram for chrono::fea::ChDampingReissner:

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Collaboration diagram for chrono::fea::ChDampingReissner:

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Public Member Functions
virtual void	ComputeStress (ChVector3d &n_u, ChVector3d &n_v, ChVector3d &m_u, ChVector3d &m_v, const ChVector3d &deps_u, const ChVector3d &deps_v, const ChVector3d &dkur_u, const ChVector3d &dkur_v, 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_u, const ChVector3d &deps_v, const ChVector3d &dkur_u, const ChVector3d &dkur_v, const double z_inf, const double z_sup, const double angle)
	Compute the 12x12 tangent material damping matrix, ie the jacobian [Rm]=dstress/dstrainspeed. More...

Public Attributes
ChMaterialShellReissner *	section

Member Function Documentation

◆ ComputeDampingMatrix()

void chrono::fea::ChDampingReissner::ComputeDampingMatrix	(	ChMatrixRef	R,
		const ChVector3d &	deps_u,
		const ChVector3d &	deps_v,
		const ChVector3d &	dkur_u,
		const ChVector3d &	dkur_v,
		const double	z_inf,
		const double	z_sup,
		const double	angle
	)

virtual

Compute the 12x12 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	12x12 material damping matrix values here
deps_u	time derivative of strains along u direction
deps_v	time derivative of strains along v direction
dkur_u	time derivative of curvature along u direction
dkur_v	time derivative of curvature along v direction
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::ChDampingReissnerRayleigh.

◆ ComputeStress()

virtual void chrono::fea::ChDampingReissner::ComputeStress	(	ChVector3d &	n_u,
		ChVector3d &	n_v,
		ChVector3d &	m_u,
		ChVector3d &	m_v,
		const ChVector3d &	deps_u,
		const ChVector3d &	deps_v,
		const ChVector3d &	dkur_u,
		const ChVector3d &	dkur_v,
		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_u	forces along u direction (per unit length)
n_v	forces along v direction (per unit length)
m_u	torques along u direction (per unit length)
m_v	torques along v direction (per unit length)
deps_u	time derivative of strains along u direction
deps_v	time derivative of strains along v direction
dkur_u	time derivative of curvature along u direction
dkur_v	time derivative of curvature along v direction
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::ChDampingReissnerRayleigh.

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

Description

Public Member Functions

Public Attributes

Member Function Documentation

◆ ComputeDampingMatrix()

◆ ComputeStress()