chrono::fea::ChDampingReissner Class Referenceabstract

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>

Collaboration diagram for chrono::fea::ChDampingReissner:

Public Member Functions

virtual void ComputeStress (ChVector<> &n_u, ChVector<> &n_v, ChVector<> &m_u, ChVector<> &m_v, const ChVector<> &deps_u, const ChVector<> &deps_v, const ChVector<> &dkur_u, const ChVector<> &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 ChVector<> &deps_u, const ChVector<> &deps_v, const ChVector<> &dkur_u, const ChVector<> &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

ChMaterialShellReissnersection
 

Member Function Documentation

◆ ComputeDampingMatrix()

void chrono::fea::ChDampingReissner::ComputeDampingMatrix ( ChMatrixRef  R,
const ChVector<> &  deps_u,
const ChVector<> &  deps_v,
const ChVector<> &  dkur_u,
const ChVector<> &  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
R12x12 material damping matrix values here
deps_utime derivative of strains along u direction
deps_vtime derivative of strains along v direction
dkur_utime derivative of curvature along u direction
dkur_vtime derivative of curvature along v direction
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::ChDampingReissner::ComputeStress ( ChVector<> &  n_u,
ChVector<> &  n_v,
ChVector<> &  m_u,
ChVector<> &  m_v,
const ChVector<> &  deps_u,
const ChVector<> &  deps_v,
const ChVector<> &  dkur_u,
const ChVector<> &  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_uforces along u direction (per unit length)
n_vforces along v direction (per unit length)
m_utorques along u direction (per unit length)
m_vtorques along v direction (per unit length)
deps_utime derivative of strains along u direction
deps_vtime derivative of strains along v direction
dkur_utime derivative of curvature along u direction
dkur_vtime derivative of curvature along v direction
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/ChMaterialShellReissner.h
  • /builds/uwsbel/chrono/src/chrono/fea/ChMaterialShellReissner.cpp