diff --git a/MaterialLib/SolidModels/CreateCreepBGRa.cpp b/MaterialLib/SolidModels/CreateCreepBGRa.cpp
index 9c63f0ea152b32ec8ec7e1efabf04ebd30884776..3ba7d751ad246ed84ad6d0520718f4767a0ab594 100644
--- a/MaterialLib/SolidModels/CreateCreepBGRa.cpp
+++ b/MaterialLib/SolidModels/CreateCreepBGRa.cpp
@@ -22,6 +22,7 @@
#include "BaseLib/Error.h"
#include "ProcessLib/Parameter/Parameter.h"
+#include "ProcessLib/Utils/ProcessUtils.h" // required for findParameter
namespace MaterialLib
{
@@ -39,27 +40,27 @@ createCreepBGRa(
config.checkConfigParameter("type", "CreepBGRa");
DBUG("Create CreepBGRa material");
- // Read elastic data frist.
+ // Read elastic data first.
const bool skip_type_checking = true;
auto elastic_data =
MaterialLib::Solids::createLinearElasticIsotropic<DisplacementDim>(
parameters, config, skip_type_checking);
- //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__a}
- const auto A = config.getConfigParameter<double>("a");
- DBUG("CreepBGRa parameter A=%g", A);
+ auto& A = ProcessLib::findParameter<double>(
+ //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__a}
+ config, "a", parameters, 1);
- //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__n}
- const auto n = config.getConfigParameter<double>("n");
- DBUG("CreepBGRa parameter n=%g", n);
+ auto& n = ProcessLib::findParameter<double>(
+ //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__n}
+ config, "n", parameters, 1);
- //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__sigma0}
- const auto sigma0 = config.getConfigParameter<double>("sigma0");
- DBUG("CreepBGRa parameter sigma0=%g", sigma0);
+ auto& sigma0 = ProcessLib::findParameter<double>(
+ //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__sigma0}
+ config, "sigma0", parameters, 1);
- //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__q}
- const auto Q = config.getConfigParameter<double>("q");
- DBUG("CreepBGRa parameter Q=%g", Q);
+ auto& Q = ProcessLib::findParameter<double>(
+ //! \ogs_file_param_special{material__solid__constitutive_relation__CreepBGRa__q}
+ config, "q", parameters, 1);
auto const nonlinear_solver_parameters =
createNewtonRaphsonSolverParameters(config);
diff --git a/MaterialLib/SolidModels/CreepBGRa.cpp b/MaterialLib/SolidModels/CreepBGRa.cpp
index 5448fcf43554e5f0e53cd6a345d1752ea6f01bf6..d09b7aff66346d2794c7a6c9e41f160c90e2d9e8 100644
--- a/MaterialLib/SolidModels/CreepBGRa.cpp
+++ b/MaterialLib/SolidModels/CreepBGRa.cpp
@@ -43,9 +43,16 @@ CreepBGRa<DisplacementDim>::integrateStress(
KelvinVector sigma_try = sigma_prev + C * (eps - eps_prev);
ResidualVectorType solution = sigma_try;
+ const double A = _a(t, x)[0];
+ const double n = _n(t, x)[0];
+ const double sigma0 = _sigma_f(t, x)[0];
+ const double Q = _q(t, x)[0];
+
+ const double coef = A * std::pow(1.5, 0.5 * (1 + n)) / std::pow(sigma0, n);
+
const double b =
- dt * _coef *
- std::exp(-_q / (MaterialLib::PhysicalConstant::IdealGasConstant * T));
+ dt * coef *
+ std::exp(-Q / (MaterialLib::PhysicalConstant::IdealGasConstant * T));
auto const& deviatoric_matrix = Invariants::deviatoric_projection;
// In newton_solver.solve(), the Jacobian is calculated first, and then
@@ -65,12 +72,12 @@ CreepBGRa<DisplacementDim>::integrateStress(
double const norm_s_n1 = Invariants::FrobeniusNorm(s_n1);
// side effect
pow_norm_s_n1_n_minus_one_2b_G =
- 2.0 * b * this->_mp.mu(t, x) * std::pow(norm_s_n1, _n - 1);
- jacobian = KelvinMatrix::Identity() +
- pow_norm_s_n1_n_minus_one_2b_G *
- (deviatoric_matrix +
- ((_n - 1) / (norm_s_n1 * norm_s_n1)) * s_n1 *
- s_n1.transpose());
+ 2.0 * b * this->_mp.mu(t, x) * std::pow(norm_s_n1, n - 1);
+ jacobian =
+ KelvinMatrix::Identity() +
+ pow_norm_s_n1_n_minus_one_2b_G *
+ (deviatoric_matrix +
+ ((n - 1) / (norm_s_n1 * norm_s_n1)) * s_n1 * s_n1.transpose());
};
auto const update_residual = [&](ResidualVectorType& r) {
@@ -110,11 +117,17 @@ double CreepBGRa<DisplacementDim>::getTemperatureRelatedCoefficient(
double const t, double const dt, ProcessLib::SpatialPosition const& x,
double const T, double const deviatoric_stress_norm) const
{
- return 2.0 * _coef *
- std::exp(-_q /
+ const double A = _a(t, x)[0];
+ const double n = _n(t, x)[0];
+ const double sigma0 = _sigma_f(t, x)[0];
+ const double Q = _q(t, x)[0];
+
+ const double coef = A * std::pow(1.5, 0.5 * (1 + n)) / std::pow(sigma0, n);
+ return 2.0 * coef *
+ std::exp(-Q /
(MaterialLib::PhysicalConstant::IdealGasConstant * T)) *
- this->_mp.mu(t, x) * std::pow(deviatoric_stress_norm, _n - 1) * dt *
- _q / (MaterialLib::PhysicalConstant::IdealGasConstant * T * T);
+ this->_mp.mu(t, x) * std::pow(deviatoric_stress_norm, n - 1) * dt *
+ Q / (MaterialLib::PhysicalConstant::IdealGasConstant * T * T);
}
template class CreepBGRa<2>;
diff --git a/MaterialLib/SolidModels/CreepBGRa.h b/MaterialLib/SolidModels/CreepBGRa.h
index a243d308cc7ce8a73e5c4ef81cf3547690409aa9..ee29d0e23c4d75249d39d2f34302534aea1f5772 100644
--- a/MaterialLib/SolidModels/CreepBGRa.h
+++ b/MaterialLib/SolidModels/CreepBGRa.h
@@ -18,6 +18,7 @@
#include "LinearElasticIsotropic.h"
#include "MathLib/KelvinVector.h"
#include "NumLib/NewtonRaphson.h"
+#include "ProcessLib/Parameter/Parameter.h"
namespace MaterialLib
{
@@ -50,6 +51,8 @@ public:
using KelvinMatrix =
MathLib::KelvinVector::KelvinMatrixType<DisplacementDim>;
+ using Parameter = ProcessLib::Parameter<double>;
+
std::unique_ptr<
typename MechanicsBase<DisplacementDim>::MaterialStateVariables>
createMaterialStateVariables() override
@@ -61,19 +64,21 @@ public:
CreepBGRa(
typename LinearElasticIsotropic<DisplacementDim>::MaterialProperties mp,
NumLib::NewtonRaphsonSolverParameters nonlinear_solver_parameters,
- const double A, const double n, const double sigma0, const double Q)
+ Parameter const& A, Parameter const& n, Parameter const& sigma_f,
+ Parameter const& Q)
: LinearElasticIsotropic<DisplacementDim>(std::move(mp)),
_nonlinear_solver_parameters(std::move(nonlinear_solver_parameters)),
+ _a(A),
_n(n),
- _coef(A * std::pow(1.5, 0.5 * (1 + _n)) / std::pow(sigma0, _n)),
+ _sigma_f(sigma_f),
_q(Q)
{
}
- boost::optional<std::tuple<KelvinVector,
- std::unique_ptr<typename MechanicsBase<
- DisplacementDim>::MaterialStateVariables>,
- KelvinMatrix>>
+ boost::optional<
+ std::tuple<KelvinVector, std::unique_ptr<typename MechanicsBase<
+ DisplacementDim>::MaterialStateVariables>,
+ KelvinMatrix>>
integrateStress(
double const t, ProcessLib::SpatialPosition const& x, double const dt,
KelvinVector const& eps_prev, KelvinVector const& eps,
@@ -94,10 +99,10 @@ public:
private:
NumLib::NewtonRaphsonSolverParameters const _nonlinear_solver_parameters;
- const double _n; /// Creep rate exponent n.
- /// \f$A\left(\frac{3}{2}\right)^{n/2+1}/\sigma_{eff}^n \f$
- const double _coef;
- const double _q; /// Activation energy
+ Parameter const& _a; /// A parameter determined by experiment.
+ Parameter const& _n; /// Creep rate exponent n.
+ Parameter const& _sigma_f; /// A stress scaling factor.
+ Parameter const& _q; /// Activation energy
};
extern template class CreepBGRa<2>;
diff --git a/Tests/Data/ThermoMechanics/CreepBGRa/CreepAfterExcavation/CreepAfterExcavation.prj b/Tests/Data/ThermoMechanics/CreepBGRa/CreepAfterExcavation/CreepAfterExcavation.prj
index de8f4d0112986216915464022f995436f04c3d3e..afd7a74da54027bc87a49b1ecfddb39b57baf032 100644
--- a/Tests/Data/ThermoMechanics/CreepBGRa/CreepAfterExcavation/CreepAfterExcavation.prj
+++ b/Tests/Data/ThermoMechanics/CreepBGRa/CreepAfterExcavation/CreepAfterExcavation.prj
@@ -15,10 +15,10 @@
<type>CreepBGRa</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
- <a>2.0833333333333334e-06</a>
- <n>4.9</n>
- <sigma0>1e6</sigma0>
- <q>54000</q>
+ <a>A</a>
+ <n>n</n>
+ <sigma0>sigma_f</sigma0>
+ <q>Q</q>
<nonlinear_solver>
<maximum_iterations>1000</maximum_iterations>
<error_tolerance>2e-8</error_tolerance>
@@ -109,6 +109,27 @@
</time_loop>
<parameters>
+ <parameter>
+ <name>A</name>
+ <type>Constant</type>
+ <value>2.0833333333333334e-06</value>
+ </parameter>
+ <parameter>
+ <name>n</name>
+ <type>Constant</type>
+ <value>4.9</value>
+ </parameter>
+ <parameter>
+ <name>sigma_f</name>
+ <type>Constant</type>
+ <value>1.0e+6</value>
+ </parameter>
+ <parameter>
+ <name>Q</name>
+ <type>Constant</type>
+ <value>54000</value>
+ </parameter>
+
<parameter>
<name>E</name>
<type>MeshElement</type>
diff --git a/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreep.prj b/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreep.prj
index 86f983a7484e559eca0feb4c2c32746b2c96a5ec..e7752f3824a86fa74d7f87c013eab4ede5e2d5a2 100644
--- a/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreep.prj
+++ b/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreep.prj
@@ -11,10 +11,10 @@
<type>CreepBGRa</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
- <a>0.18</a>
- <n>5.0</n>
- <sigma0>1</sigma0>
- <q>54000</q>
+ <a>A</a>
+ <n>n</n>
+ <sigma0>sigma_f</sigma0>
+ <q>Q</q>
<nonlinear_solver>
<maximum_iterations>1000</maximum_iterations>
<error_tolerance>1e-8</error_tolerance>
@@ -105,6 +105,27 @@
</time_loop>
<parameters>
+ <parameter>
+ <name>A</name>
+ <type>Constant</type>
+ <value>0.18</value>
+ </parameter>
+ <parameter>
+ <name>n</name>
+ <type>Constant</type>
+ <value>5.0</value>
+ </parameter>
+ <parameter>
+ <name>sigma_f</name>
+ <type>Constant</type>
+ <value>1</value>
+ </parameter>
+ <parameter>
+ <name>Q</name>
+ <type>Constant</type>
+ <value>54000</value>
+ </parameter>
+
<parameter>
<name>E</name>
<type>Constant</type>
diff --git a/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreepWithAnalyticSolution.prj b/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreepWithAnalyticSolution.prj
index cef8ba5bf9b47e0e1cfc82777dcba99ddbc4c780..7c66a11b8bb2af76efcf1496eb201b197d4f7a9b 100644
--- a/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreepWithAnalyticSolution.prj
+++ b/Tests/Data/ThermoMechanics/CreepBGRa/SimpleAxisymmetricCreep/SimpleAxisymmetricCreepWithAnalyticSolution.prj
@@ -11,10 +11,10 @@
<type>CreepBGRa</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
- <a>0.18</a>
- <n>5.0</n>
- <sigma0>1</sigma0>
- <q>54000</q>
+ <a>A</a>
+ <n>n</n>
+ <sigma0>sigma_f</sigma0>
+ <q>Q</q>
<nonlinear_solver>
<maximum_iterations>1000</maximum_iterations>
<error_tolerance>1e-8</error_tolerance>
@@ -93,6 +93,27 @@
</time_loop>
<parameters>
+ <parameter>
+ <name>A</name>
+ <type>Constant</type>
+ <value>0.18</value>
+ </parameter>
+ <parameter>
+ <name>n</name>
+ <type>Constant</type>
+ <value>5.0</value>
+ </parameter>
+ <parameter>
+ <name>sigma_f</name>
+ <type>Constant</type>
+ <value>1</value>
+ </parameter>
+ <parameter>
+ <name>Q</name>
+ <type>Constant</type>
+ <value>54000</value>
+ </parameter>
+
<parameter>
<name>E</name>
<type>Constant</type>