chrono::fea::ChContinuumDruckerPrager Class Reference
Description
Class for the basic properties of elastoplastic materials of Drucker-Prager type, that are useful for simulating soils.
#include <ChContinuumMaterial.h>
Inheritance diagram for chrono::fea::ChContinuumDruckerPrager:
Collaboration diagram for chrono::fea::ChContinuumDruckerPrager:
Public Member Functions | |
| ChContinuumDruckerPrager (double young=10000000, double poisson=0.4, double density=1000, double elastic_yield=0.1, double alpha=0.5, double dilatancy=0) | |
| Create a continuum isotropic Drucker-Prager material. | |
| ChContinuumDruckerPrager (const ChContinuumDruckerPrager &other) | |
| void | SetElasticYield (double elastic_yield) |
| Set the D-P yield modulus C, for Drucker-Prager yield. More... | |
| double | GetElasticYield () const |
| Get the elastic yield modulus C. | |
| void | SetInternalFriction (double alpha) |
| Set the internal friction coefficient A. | |
| double | GetInternalFriction () const |
| Get the internal friction coefficient A. | |
| void | SetFromMohrCoulomb (double phi, double cohesion, bool inner_approx=true) |
| Sets the C and A parameters of the Drucker-Prager model starting from more 'practical' values of inner friction angle phi and cohesion, as used in the faceted Mohr-Coulomb model. More... | |
| virtual void | SetPlasticFlowRate (double flow_rate) override |
| Set the plastic flow rate multiplier. More... | |
| virtual double | GetPlasticFlowRate () const override |
| Get the flow rate multiplier. | |
| void | SetDilatancy (double dilatancy) |
| Set the internal dilatation coefficient (usually 0.. < int.friction) | |
| double | GetDilatancy () const |
| Get the internal dilatation coefficient. | |
| void | SetHardeningLimit (double hl) |
| Set the hardening limit (usually a bit larger than yield), or softening. | |
| double | GetHardeningLimit () const |
| Get the hardening limit. | |
| void | SetHardeningSpeed (double hl) |
| Set the hardening inverse speed coeff. More... | |
| double | GetHardeningSpeed () const |
| Get the hardening speed. | |
| virtual double | ComputeYieldFunction (const ChStressTensor<> &stress) const override |
| Return a scalar value that is 0 on the yield surface, <0 inside (elastic), >0 outside (incompatible->plastic flow) | |
| virtual void | ComputeReturnMapping (ChStrainTensor<> &plasticstrainflow, const ChStrainTensor<> &incrementstrain, const ChStrainTensor<> &lastelasticstrain, const ChStrainTensor<> &lastplasticstrain) const override |
| Correct the strain-stress by enforcing that elastic stress must remain on the yield surface, computing a plastic flow to be added to plastic strain while integrating. | |
| virtual void | ComputePlasticStrainFlow (ChStrainTensor<> &plasticstrainflow, const ChStrainTensor<> &totstrain) const override |
| Compute plastic strain flow direction from strain according to Drucker-Prager. | |
| virtual void | ArchiveOut (ChArchiveOut &archive_out) override |
| virtual void | ArchiveIn (ChArchiveIn &archive_in) override |
 Public Member Functions inherited from chrono::fea::ChContinuumElastoplastic | |
| ChContinuumElastoplastic (double young=10000000, double poisson=0.4, double density=1000) | |
| Public Member Functions inherited from chrono::fea::ChContinuumElastic | |
| ChContinuumElastic (double young=10000000, double poisson=0.4, double density=1000) | |
| ChContinuumElastic (const ChContinuumElastic &other) | |
| void | SetYoungModulus (double E) |
| Set the Young elastic modulus, in Pa (N/m^2), as the ratio of the uniaxial stress over the uniaxial strain, for hookean materials. | |
| double | GetYoungModulus () const |
| Get the Young elastic modulus, in Pa (N/m^2). | |
| void | SetPoissonRatio (double v) |
| Set the Poisson ratio, as v=-transverse_strain/axial_strain, so takes into account the 'squeezing' effect of materials that are pulled. More... | |
| double | GetPoissonRatio () const |
| Get the Poisson ratio, as v=-transverse_strain/axial_strain. | |
| void | SetShearModulus (double G) |
| Set the shear modulus G, in Pa (N/m^2). More... | |
| double | GetShearModulus () const |
| Get the shear modulus G, in Pa (N/m^2) | |
| double | GetLameFirstParam () const |
| Get Lamé first parameter (the second is shear modulus, so GetShearModulus() ) | |
| double | GetBulkModulus () const |
| Get bulk modulus (increase of pressure for decrease of volume), in Pa. | |
| double | GetPWaveModulus () const |
| Get P-wave modulus (if V=speed of propagation of a P-wave, then (M/density)=V^2 ) | |
| void | ComputeStressStrainMatrix () |
| Computes Elasticity matrix and stores the value in this->StressStrainMatrix Note: is performed every time you change a material parameter. | |
| ChMatrixDynamic & | GetStressStrainMatrix () |
| Get the Elasticity matrix. | |
| void | ComputeElasticStress (ChStressTensor<> &stress, const ChStrainTensor<> &strain) const |
| Compute elastic stress from elastic strain (using column tensors, in Voight notation) | |
| void | ComputeElasticStrain (ChStrainTensor<> &strain, const ChStressTensor<> &stress) const |
| Compute elastic strain from elastic stress (using column tensors, in Voight notation) | |
| void | SetRayleighDampingAlpha (double alpha) |
| Set the Rayleigh mass-proportional damping factor alpha, to build damping R as R=alpha*M + beta*K. | |
| double | GetRayleighDampingAlpha () const |
| Set the Rayleigh mass-proportional damping factor alpha, in R=alpha*M + beta*K. | |
| void | SetRayleighDampingBeta (double beta) |
| Set the Rayleigh stiffness-proportional damping factor beta, to build damping R as R=alpha*M + beta*K. | |
| double | GetRayleighDampingBeta () const |
| Set the Rayleigh stiffness-proportional damping factor beta, in R=alpha*M + beta*K. | |
| Public Member Functions inherited from chrono::fea::ChContinuumMaterial | |
| ChContinuumMaterial (double density=1000) | |
| ChContinuumMaterial (const ChContinuumMaterial &other) | |
| void | SetDensity (double density) |
| Set the density of the material, in kg/m^2. | |
| double | GetDensity () const |
| Get the density of the material, in kg/m^2. | |
Additional Inherited Members | |
| Protected Attributes inherited from chrono::fea::ChContinuumMaterial | |
| double | m_density |
Member Function Documentation
◆ SetElasticYield()
|
inline |
Set the D-P yield modulus C, for Drucker-Prager yield.
It defines the transition elastic->plastic.
◆ SetFromMohrCoulomb()
| void chrono::fea::ChContinuumDruckerPrager::SetFromMohrCoulomb | ( | double | phi, |
| double | cohesion, | ||
| bool | inner_approx = true |
||
| ) |
Sets the C and A parameters of the Drucker-Prager model starting from more 'practical' values of inner friction angle phi and cohesion, as used in the faceted Mohr-Coulomb model.
Use the optional parameter inner_approx to set if the faceted Mohr-Coulomb must be approximated with D-P inscribed (default) or circumscribed.
◆ SetHardeningSpeed()
|
inline |
Set the hardening inverse speed coeff.
for exponential hardening (the larger, the slower the hardening or softening process that will asymptotically make yield = hardening_limit )
◆ SetPlasticFlowRate()
|
inlineoverridevirtual |
Set the plastic flow rate multiplier.
The lower the value, the slower the plastic flow during dynamic simulations.
Implements chrono::fea::ChContinuumElastoplastic.
The documentation for this class was generated from the following files:
- /builds/uwsbel/chrono/src/chrono/fea/ChContinuumMaterial.h
- /builds/uwsbel/chrono/src/chrono/fea/ChContinuumMaterial.cpp
