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>
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 | |
| ChMaterialShellReissner * | section |
Member Function Documentation
◆ ComputeDampingMatrix()
|
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()
|
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
