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rAKA/src/model/solid_mechanics/materials/material_viscoelastic/material_standard_linear_solid_deviatoric.cc
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material_standard_linear_solid_deviatoric.cc
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/**
* @file material_standard_linear_solid_deviatoric.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Vladislav Yastrebov <vladislav.yastrebov@epfl.ch>
*
* @date creation: Wed May 04 2011
* @date last modification: Thu Oct 15 2015
*
* @brief Material Visco-elastic
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014, 2015 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "material_standard_linear_solid_deviatoric.hh"
#include "solid_mechanics_model.hh"
namespace akantu {
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
MaterialStandardLinearSolidDeviatoric<spatial_dimension>::MaterialStandardLinearSolidDeviatoric(SolidMechanicsModel & model, const ID & id) :
MaterialElastic<spatial_dimension>(model, id),
stress_dev("stress_dev", *this),
history_integral("history_integral", *this),
dissipated_energy("dissipated_energy", *this) {
AKANTU_DEBUG_IN();
this->registerParam("Eta", eta, Real(1.), _pat_parsable | _pat_modifiable, "Viscosity");
this->registerParam("Ev", Ev, Real(1.), _pat_parsable | _pat_modifiable, "Stiffness of the viscous element");
this->registerParam("Einf", E_inf, Real(1.), _pat_readable, "Stiffness of the elastic element");
UInt stress_size = spatial_dimension * spatial_dimension;
this->stress_dev .initialize(stress_size);
this->history_integral .initialize(stress_size);
this->dissipated_energy.initialize(1);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialStandardLinearSolidDeviatoric<spatial_dimension>::initMaterial() {
AKANTU_DEBUG_IN();
updateInternalParameters();
MaterialElastic<spatial_dimension>::initMaterial();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialStandardLinearSolidDeviatoric<spatial_dimension>::updateInternalParameters() {
MaterialElastic<spatial_dimension>::updateInternalParameters();
E_inf = this->E - this->Ev;
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialStandardLinearSolidDeviatoric<spatial_dimension>::setToSteadyState(ElementType el_type, GhostType ghost_type) {
AKANTU_DEBUG_IN();
Array<Real> & stress_dev_vect = stress_dev(el_type, ghost_type);
Array<Real> & history_int_vect = history_integral(el_type, ghost_type);
Array<Real>::matrix_iterator stress_d = stress_dev_vect.begin(spatial_dimension, spatial_dimension);
Array<Real>::matrix_iterator history_int = history_int_vect.begin(spatial_dimension, spatial_dimension);
/// Loop on all quadrature points
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
Matrix<Real> & dev_s = *stress_d;
Matrix<Real> & h = *history_int;
/// Compute the first invariant of strain
Real Theta = grad_u.trace();
for (UInt i = 0; i < spatial_dimension; ++i)
for (UInt j = 0; j < spatial_dimension; ++j) {
dev_s(i, j) = 2 * this->mu * (.5 * (grad_u(i,j) + grad_u(j,i)) - 1./3. * Theta *(i == j));
h(i, j) = 0.;
}
/// Save the deviator of stress
++stress_d;
++history_int;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialStandardLinearSolidDeviatoric<spatial_dimension>::computeStress(ElementType el_type, GhostType ghost_type) {
AKANTU_DEBUG_IN();
Real tau = 0.;
// if(std::abs(Ev) > std::numeric_limits<Real>::epsilon())
tau = eta / Ev;
Array<Real> & stress_dev_vect = stress_dev(el_type, ghost_type);
Array<Real> & history_int_vect = history_integral(el_type, ghost_type);
Array<Real>::matrix_iterator stress_d = stress_dev_vect.begin(spatial_dimension, spatial_dimension);
Array<Real>::matrix_iterator history_int = history_int_vect.begin(spatial_dimension, spatial_dimension);
Matrix<Real> s(spatial_dimension, spatial_dimension);
Real dt = this->model.getTimeStep();
Real exp_dt_tau = exp( -dt/tau );
Real exp_dt_tau_2 = exp( -.5*dt/tau );
Matrix<Real> epsilon_d(spatial_dimension, spatial_dimension);
Matrix<Real> epsilon_v(spatial_dimension, spatial_dimension);
/// Loop on all quadrature points
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
Matrix<Real> & dev_s = *stress_d;
Matrix<Real> & h = *history_int;
s.clear();
sigma.clear();
/// Compute the first invariant of strain
Real gamma_inf = E_inf / this->E;
Real gamma_v = Ev / this->E;
this->template gradUToEpsilon<spatial_dimension>(grad_u, epsilon_d);
Real Theta = epsilon_d.trace();
epsilon_v.eye(Theta / Real(3.));
epsilon_d -= epsilon_v;
Matrix<Real> U_rond_prim(spatial_dimension, spatial_dimension);
U_rond_prim.eye(gamma_inf * this->kpa * Theta);
for (UInt i = 0; i < spatial_dimension; ++i)
for (UInt j = 0; j < spatial_dimension; ++j) {
s(i, j) = 2 * this->mu * epsilon_d(i, j);
h(i, j) = exp_dt_tau * h(i, j) + exp_dt_tau_2 * (s(i, j) - dev_s(i, j));
dev_s(i, j) = s(i, j);
sigma(i, j) = U_rond_prim(i,j) + gamma_inf * s(i, j) + gamma_v * h(i, j);
}
/// Save the deviator of stress
++stress_d;
++history_int;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
this->updateDissipatedEnergy(el_type, ghost_type);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
void MaterialStandardLinearSolidDeviatoric<spatial_dimension>::updateDissipatedEnergy(ElementType el_type,
GhostType ghost_type) {
AKANTU_DEBUG_IN();
// if(ghost_type == _ghost) return 0.;
Real tau = 0.;
tau = eta / Ev;
Real * dis_energy = dissipated_energy(el_type, ghost_type).storage();
Array<Real> & stress_dev_vect = stress_dev(el_type, ghost_type);
Array<Real> & history_int_vect = history_integral(el_type, ghost_type);
Array<Real>::matrix_iterator stress_d = stress_dev_vect.begin(spatial_dimension, spatial_dimension);
Array<Real>::matrix_iterator history_int = history_int_vect.begin(spatial_dimension, spatial_dimension);
Matrix<Real> q(spatial_dimension, spatial_dimension);
Matrix<Real> q_rate(spatial_dimension, spatial_dimension);
Matrix<Real> epsilon_d(spatial_dimension, spatial_dimension);
Matrix<Real> epsilon_v(spatial_dimension, spatial_dimension);
Real dt = this->model.getTimeStep();
Real gamma_v = Ev / this->E;
Real alpha = 1. / (2. * this->mu * gamma_v);
/// Loop on all quadrature points
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_BEGIN(el_type, ghost_type);
Matrix<Real> & dev_s = *stress_d;
Matrix<Real> & h = *history_int;
/// Compute the first invariant of strain
this->template gradUToEpsilon<spatial_dimension>(grad_u, epsilon_d);
Real Theta = epsilon_d.trace();
epsilon_v.eye(Theta / Real(3.));
epsilon_d -= epsilon_v;
q.copy(dev_s);
q -= h;
q *= gamma_v;
q_rate.copy(dev_s);
q_rate *= gamma_v;
q_rate -= q;
q_rate /= tau;
for (UInt i = 0; i < spatial_dimension; ++i)
for (UInt j = 0; j < spatial_dimension; ++j)
*dis_energy += (epsilon_d(i, j) - alpha * q(i, j)) * q_rate(i, j) * dt;
/// Save the deviator of stress
++stress_d;
++history_int;
++dis_energy;
MATERIAL_STRESS_QUADRATURE_POINT_LOOP_END;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialStandardLinearSolidDeviatoric<spatial_dimension>::getDissipatedEnergy() const {
AKANTU_DEBUG_IN();
Real de = 0.;
/// integrate the dissipated energy for each type of elements
for(auto & type : this->element_filter.elementTypes(spatial_dimension, _not_ghost)) {
de += this->fem.integrate(dissipated_energy(type, _not_ghost), type,
_not_ghost, this->element_filter(type, _not_ghost));
}
AKANTU_DEBUG_OUT();
return de;
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialStandardLinearSolidDeviatoric<spatial_dimension>::getDissipatedEnergy(ElementType type, UInt index) const {
AKANTU_DEBUG_IN();
UInt nb_quadrature_points = this->fem.getNbIntegrationPoints(type);
Array<Real>::const_vector_iterator it = this->dissipated_energy(type, _not_ghost).begin(nb_quadrature_points);
UInt gindex = (this->element_filter(type, _not_ghost))(index);
AKANTU_DEBUG_OUT();
return this->fem.integrate(it[index], type, gindex);
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialStandardLinearSolidDeviatoric<spatial_dimension>::getEnergy(std::string type) {
if(type == "dissipated") return getDissipatedEnergy();
else if(type == "dissipated_sls_deviatoric") return getDissipatedEnergy();
else return MaterialElastic<spatial_dimension>::getEnergy(type);
}
/* -------------------------------------------------------------------------- */
template<UInt spatial_dimension>
Real MaterialStandardLinearSolidDeviatoric<spatial_dimension>::getEnergy(std::string energy_id, ElementType type, UInt index) {
if(energy_id == "dissipated") return getDissipatedEnergy(type, index);
else if(energy_id == "dissipated_sls_deviatoric") return getDissipatedEnergy(type, index);
else return MaterialElastic<spatial_dimension>::getEnergy(energy_id, type, index);
}
/* -------------------------------------------------------------------------- */
INSTANTIATE_MATERIAL(MaterialStandardLinearSolidDeviatoric);
} // akantu
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