Description
Class for the basic properties of materials in 3D continua where stress can be computed from some deformation measure and some state.
#include <ChMaterial3DStress.h>
Public Member Functions | |
| virtual void | ComputeStress (ChStressTensor<> &S_stress, const ChMatrix33d &F_def, const ChMatrix33d *l, ChFieldData *data_per_point, ChElementData *data_per_element)=0 |
| Compute elastic stress from finite strain, passed as 3x3 deformation gradient tensor F_def. More... | |
| virtual void | ComputeTangentModulus (ChMatrixNM< double, 6, 6 > &C, const ChMatrix33d &F_def, const ChMatrix33d *l, ChFieldData *data_per_point, ChElementData *data_per_element)=0 |
| Computes the 6x6 tangent modulus for a given strain, assuming the definition dS = C * dE, that maps variations of S, 2nd Piola-Kirchhoff stress, and of E, Green Lagrange strains, both in Voigt notation. More... | |
| virtual void | ComputeUpdateEndStep (ChFieldData *data_per_point, ChElementData *data_per_element, const double time) |
| Update your own auxiliary data, if any, at the end of time step (ex for plasticity). More... | |
| virtual bool | IsSpatialVelocityGradientNeeded () const =0 |
| Some material need info on the spatial velocity gradient l=\nabla_x v , where the time derivative of the deformation gradient F is dF/dt = l*F. More... | |
 Public Member Functions inherited from chrono::fea::ChMaterial3DDensity | |
| ChMaterial3DDensity (double density=1000) | |
| virtual void | SetDensity (double density) |
| Set the density of the material, in kg/m^2. | |
| virtual double | GetDensity () const |
| Get the density of the material, in kg/m^2. | |
| Public Member Functions inherited from chrono::fea::ChMaterial | |
| virtual std::unique_ptr< ChFieldData > | CreateMaterialPointData () const |
| Implement this if the material needs custom data per material point, returning a std::make_unique<ChFieldDataCustom>() where ChFieldDataCustom is your custom class with aditional states/properties per-point. | |
Additional Inherited Members | |
| Protected Attributes inherited from chrono::fea::ChMaterial3DDensity | |
| double | m_density |
Member Function Documentation
◆ ComputeStress()
|
pure virtual |
Compute elastic stress from finite strain, passed as 3x3 deformation gradient tensor F_def.
Assuming stress is 2nd Piola-Kirchhoff tensor "S_stress", in Voigt notation. Some materials could also make use of spatial velocity gradient "l", ex. for damping effects, and of the "data_per_point" auxiliary structure, that could contain states like in plasticity.
- Parameters
-
S_stress output stress, PK2 F_def current deformation gradient tensor l current spatial velocity gradient (might be nullptr if IsSpatialVelocityGradientNeeded() is false) data_per_point pointer to auxiliary data (ex states), if any, per quadrature point data_per_element pointer to auxiliary data (ex states), if any, per element
Implemented in chrono::fea::ChMaterial3DStressKelvinVoigt, and chrono::fea::ChMaterial3DHyperelastic.
◆ ComputeTangentModulus()
|
pure virtual |
Computes the 6x6 tangent modulus for a given strain, assuming the definition dS = C * dE, that maps
variations of S, 2nd Piola-Kirchhoff stress, and of E, Green Lagrange strains, both in Voigt notation.
Assuming current strain is a 3x3 deformation gradient tensor F_def.
- Parameters
-
C output C tangent modulus, as dS=C*dE F_def current deformation gradient tensor l current spatial velocity gradient (might be nullptr if IsSpatialVelocityGradientNeeded() is false) data_per_point pointer to auxiliary data (ex states), if any, per quadrature point data_per_element pointer to auxiliary data (ex states), if any, per element
Implemented in chrono::fea::ChMaterial3DStressKelvinVoigt, and chrono::fea::ChMaterial3DHyperelastic.
◆ ComputeUpdateEndStep()
|
inlinevirtual |
Update your own auxiliary data, if any, at the end of time step (ex for plasticity).
This is called at the end of every time step (or nl static step)
- Parameters
-
data_per_point pointer to auxiliary data (ex states), if any, per quadrature point data_per_element pointer to auxiliary data (ex states), if any, per element
Reimplemented in chrono::fea::ChMaterial3DStressKelvinVoigt.
◆ IsSpatialVelocityGradientNeeded()
|
pure virtual |
Some material need info on the spatial velocity gradient l=\nabla_x v , where the time derivative of the deformation gradient F is dF/dt = l*F.
Some others, do not need this info. For optimization reason, then, the ChDomainXXYY queries this, and knows if the "l" parameter could be left to null when calling ComputeStress(...)
Implemented in chrono::fea::ChMaterial3DHyperelastic, and chrono::fea::ChMaterial3DStressKelvinVoigt.
The documentation for this class was generated from the following file:
- /builds/uwsbel/chrono/src/chrono/fea/ChMaterial3DStress.h
