chrono::fea::ChDampingKirchhoff Class Referenceabstract

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>

Collaboration diagram for chrono::fea::ChDampingKirchhoff:

Public Member Functions

virtual void ComputeStress (ChVector<> &n, ChVector<> &m, const ChVector<> &deps, const ChVector<> &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 ChVector<> &deps, const ChVector<> &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

ChMaterialShellKirchhoffsection
 

Member Function Documentation

◆ ComputeDampingMatrix()

void chrono::fea::ChDampingKirchhoff::ComputeDampingMatrix ( ChMatrixRef  R,
const ChVector<> &  deps,
const ChVector<> &  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
R12x12 material damping matrix values here
depstime derivative of strains de_11/dt, de_22/dt, de_12/dt
dkurtime derivative of curvature dk_11/dt, dk_22/dt, dk_12/dt
z_inflayer lower z value (along thickness coord)
z_suplayer upper z value (along thickness coord)
anglelayer angle respect to x (if needed) -not used in this, isotropic

◆ ComputeStress()

virtual void chrono::fea::ChDampingKirchhoff::ComputeStress ( ChVector<> &  n,
ChVector<> &  m,
const ChVector<> &  deps,
const ChVector<> &  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
nforces n_11, n_22, n_12 (per unit length)
mtorques m_11, m_22, m_12 (per unit length)
depstime derivative of strains de_11/dt, de_22/dt, de_12/dt
dkurtime derivative of curvature dk_11/dt, dk_22/dt, dk_12/dt
z_inflayer lower z value (along thickness coord)
z_suplayer upper z value (along thickness coord)
anglelayer angle respect to x (if needed)

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