Description
Class for Ogden materials.
A subtype of hyperelastic materials. It is mostly used for plastics, rubbers, organic tissue, etc. It supports very large strains. Note, it depends on pairs of {mu_i, alpha_i} parameters, plus one parameter for bulk modulus. For stability, it must be (mu_i * alpha_i)>0, for all pairs.
#include <ChMaterial3DStressOgden.h>
Public Member Functions | |
| std::vector< double > & | CoefficientsMu () |
| access coefficients "mu" in Ogden material | |
| std::vector< double > & | CoefficientsAlpha () |
| access coefficients "alpha" in Ogden material | |
| void | SetKappa (double mk) |
| Set bulk modulus kappa. | |
| double | GetKappa () |
| Get bulk modulus kappa. | |
| void | SetAsEquivalentNeoHookean (double E, double nu) |
| For testing reasons or other reasons, initialize {alpha, mu} parameters of this material such that, for small deformations, it behaves like the linear elastic material with a given Young modulus and Poisson coeff. More... | |
| virtual void | ComputeElasticStress (ChStressTensor<> &stress, const ChMatrix33d &C_deformation) override |
| Compute elastic stress from elastic strain. More... | |
 Public Member Functions inherited from chrono::fea::ChMaterial3DHyperelastic | |
| virtual void | ComputeStress (ChStressTensor<> &S_stress, const ChMatrix33d &F, const ChMatrix33d *l, ChFieldData *data_per_point, ChElementData *data_per_element) override |
| Implement interface to lower level stress material. More... | |
| virtual void | ComputeTangentModulus (ChMatrixNM< double, 6, 6 > &C, const ChMatrix33d &F, const ChMatrix33d *l, ChFieldData *data_per_point, ChElementData *data_per_element) override |
| Implement interface to lower level stress material. More... | |
| virtual bool | IsSpatialVelocityGradientNeeded () const override |
| Hyperelastic materials do not need info on the spatial velocity gradient l=\nabla_x v , Returning false from this means that the ChDomainXXYY can know that the computation of the "l" parameter could be skipped left to null when calling ComputeStress(...) | |
| virtual void | ComputeElasticTangentModulus (ChMatrixNM< double, 6, 6 > &C_tangent, const ChMatrix33d &C_def) |
| Computes the tangent modulus for a given deformation. More... | |
| Public Member Functions inherited from chrono::fea::ChMaterial3DStress | |
| 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... | |
| 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
◆ ComputeElasticStress()
|
inlineoverridevirtual |
Compute elastic stress from elastic strain.
Starts computing Green-Lagrange strain E from C_deformation, the right Cauchy-Green deformation. For small strains the Green Lagrange strain in Voigt notation coincides with espilon tensor. Return stress as Piola-Kirchhoff S tensor, in Voigt notation. This is a very simple material, ie. a linear funciton S=C:E with C as 4th order constant tensor, also S=[C]*E with 6x6 C in Voigt notation.
Implements chrono::fea::ChMaterial3DHyperelastic.
◆ SetAsEquivalentNeoHookean()
|
inline |
For testing reasons or other reasons, initialize {alpha, mu} parameters of this material such that, for small deformations, it behaves like the linear elastic material with a given Young modulus and Poisson coeff.
It takes just two couples of {alpha, mu}.
- Parameters
-
E Young modulus nu Poisson
The documentation for this class was generated from the following file:
- /builds/uwsbel/chrono/src/chrono/fea/ChMaterial3DStressOgden.h
