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/**
* @file material_cohesive.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Seyedeh Mohadeseh Taheri Mousavi <mohadeseh.taherimousavi@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Wed Feb 22 2012
* @date last modification: Tue Jan 12 2016
*
* @brief Specialization of the material class for cohesive elements
*
* @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_cohesive.hh"
#include "aka_random_generator.hh"
#include "dof_synchronizer.hh"
#include "fe_engine_template.hh"
#include "integrator_gauss.hh"
#include "shape_cohesive.hh"
#include "solid_mechanics_model_cohesive.hh"
#include "sparse_matrix.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
MaterialCohesive::MaterialCohesive(SolidMechanicsModel & model, const ID & id)
: Material(model, id),
facet_filter("facet_filter", id, this->getMemoryID()),
fem_cohesive(
model.getFEEngineClass<MyFEEngineCohesiveType>("CohesiveFEEngine")),
reversible_energy("reversible_energy", *this),
total_energy("total_energy", *this), opening("opening", *this),
opening_old("opening (old)", *this), tractions("tractions", *this),
tractions_old("tractions (old)", *this),
contact_tractions("contact_tractions", *this),
contact_opening("contact_opening", *this), delta_max("delta max", *this),
use_previous_delta_max(false), use_previous_opening(false),
damage("damage", *this), sigma_c("sigma_c", *this),
normal(0, spatial_dimension, "normal") {
AKANTU_DEBUG_IN();
this->model = dynamic_cast<SolidMechanicsModelCohesive *>(&model);
this->registerParam("sigma_c", sigma_c, _pat_parsable | _pat_readable,
"Critical stress");
this->registerParam("delta_c", delta_c, Real(0.),
_pat_parsable | _pat_readable, "Critical displacement");
this->element_filter.initialize(this->model->getMesh(),
_spatial_dimension = spatial_dimension,
_element_kind = _ek_cohesive);
// this->model->getMesh().initElementTypeMapArray(
// this->element_filter, 1, spatial_dimension, false, _ek_cohesive);
if (this->model->getIsExtrinsic())
this->facet_filter.initialize(this->model->getMeshFacets(),
_spatial_dimension = spatial_dimension - 1,
_element_kind = _ek_regular);
// this->model->getMeshFacets().initElementTypeMapArray(facet_filter, 1,
// spatial_dimension -
// 1);
this->reversible_energy.initialize(1);
this->total_energy.initialize(1);
this->tractions_old.initialize(spatial_dimension);
this->tractions.initialize(spatial_dimension);
this->opening_old.initialize(spatial_dimension);
this->contact_tractions.initialize(spatial_dimension);
this->contact_opening.initialize(spatial_dimension);
this->opening.initialize(spatial_dimension);
this->delta_max.initialize(1);
this->damage.initialize(1);
if (this->model->getIsExtrinsic())
this->sigma_c.initialize(1);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
MaterialCohesive::~MaterialCohesive() {
AKANTU_DEBUG_IN();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MaterialCohesive::initMaterial() {
AKANTU_DEBUG_IN();
Material::initMaterial();
if (this->use_previous_delta_max)
this->delta_max.initializeHistory();
if (this->use_previous_opening)
this->opening.initializeHistory();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MaterialCohesive::assembleInternalForces(GhostType ghost_type) {
AKANTU_DEBUG_IN();
#if defined(AKANTU_DEBUG_TOOLS)
debug::element_manager.printData(debug::_dm_material_cohesive,
"Cohesive Tractions", tractions);
#endif
auto & internal_force = const_cast<Array<Real> &>(model->getInternalForce());
for (auto type : element_filter.elementTypes(spatial_dimension, ghost_type,
_ek_cohesive)) {
auto & elem_filter = element_filter(type, ghost_type);
UInt nb_element = elem_filter.size();
if (nb_element == 0)
continue;
const auto & shapes = fem_cohesive.getShapes(type, ghost_type);
auto & traction = tractions(type, ghost_type);
auto & contact_traction = contact_tractions(type, ghost_type);
UInt size_of_shapes = shapes.getNbComponent();
UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
UInt nb_quadrature_points =
fem_cohesive.getNbIntegrationPoints(type, ghost_type);
/// compute @f$t_i N_a@f$
Array<Real> * traction_cpy = new Array<Real>(
nb_element * nb_quadrature_points, spatial_dimension * size_of_shapes);
auto traction_it = traction.begin(spatial_dimension, 1);
auto contact_traction_it = contact_traction.begin(spatial_dimension, 1);
auto shapes_filtered_begin = shapes.begin(1, size_of_shapes);
auto traction_cpy_it =
traction_cpy->begin(spatial_dimension, size_of_shapes);
Matrix<Real> traction_tmp(spatial_dimension, 1);
for (UInt el = 0; el < nb_element; ++el) {
UInt current_quad = elem_filter(el) * nb_quadrature_points;
for (UInt q = 0; q < nb_quadrature_points; ++q, ++traction_it,
++contact_traction_it, ++current_quad, ++traction_cpy_it) {
const Matrix<Real> & shapes_filtered =
shapes_filtered_begin[current_quad];
traction_tmp.copy(*traction_it);
traction_tmp += *contact_traction_it;
traction_cpy_it->mul<false, false>(traction_tmp, shapes_filtered);
}
}
/**
* compute @f$\int t \cdot N\, dS@f$ by @f$ \sum_q \mathbf{N}^t
* \mathbf{t}_q \overline w_q J_q@f$
*/
Array<Real> * int_t_N = new Array<Real>(
nb_element, spatial_dimension * size_of_shapes, "int_t_N");
fem_cohesive.integrate(*traction_cpy, *int_t_N,
spatial_dimension * size_of_shapes, type, ghost_type,
elem_filter);
delete traction_cpy;
int_t_N->extendComponentsInterlaced(2, int_t_N->getNbComponent());
Real * int_t_N_val = int_t_N->storage();
for (UInt el = 0; el < nb_element; ++el) {
for (UInt n = 0; n < size_of_shapes * spatial_dimension; ++n)
int_t_N_val[n] *= -1.;
int_t_N_val += nb_nodes_per_element * spatial_dimension;
}
/// assemble
model->getDOFManager().assembleElementalArrayLocalArray(
*int_t_N, internal_force, type, ghost_type, -1, elem_filter);
delete int_t_N;
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MaterialCohesive::assembleStiffnessMatrix(GhostType ghost_type) {
AKANTU_DEBUG_IN();
for (auto type : element_filter.elementTypes(spatial_dimension, ghost_type,
_ek_cohesive)) {
UInt nb_quadrature_points =
fem_cohesive.getNbIntegrationPoints(type, ghost_type);
UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
const Array<Real> & shapes = fem_cohesive.getShapes(type, ghost_type);
Array<UInt> & elem_filter = element_filter(type, ghost_type);
UInt nb_element = elem_filter.size();
if (!nb_element)
continue;
UInt size_of_shapes = shapes.getNbComponent();
Array<Real> * shapes_filtered = new Array<Real>(
nb_element * nb_quadrature_points, size_of_shapes, "filtered shapes");
Real * shapes_val = shapes.storage();
Real * shapes_filtered_val = shapes_filtered->storage();
UInt * elem_filter_val = elem_filter.storage();
for (UInt el = 0; el < nb_element; ++el) {
shapes_val = shapes.storage() +
elem_filter_val[el] * size_of_shapes * nb_quadrature_points;
memcpy(shapes_filtered_val, shapes_val,
size_of_shapes * nb_quadrature_points * sizeof(Real));
shapes_filtered_val += size_of_shapes * nb_quadrature_points;
}
/**
* compute A matrix @f$ \mathbf{A} = \left[\begin{array}{c c c c c c c c c c
*c c}
* 1 & 0 & 0 & 0 & 0 & 0 & -1 & 0 & 0 & 0 & 0 & 0 \\
* 0 & 1 & 0 & 0 & 0 & 0 & 0 & -1 & 0 & 0 & 0 & 0 \\
* 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & -1 & 0 & 0 & 0 \\
* 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & -1 & 0 & 0 \\
* 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & -1 & 0 \\
* 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & -1
* \end{array} \right]@f$
**/
// UInt size_of_A =
// spatial_dimension*size_of_shapes*spatial_dimension*nb_nodes_per_element;
// Real * A = new Real[size_of_A];
// memset(A, 0, size_of_A*sizeof(Real));
Matrix<Real> A(spatial_dimension * size_of_shapes,
spatial_dimension * nb_nodes_per_element);
for (UInt i = 0; i < spatial_dimension * size_of_shapes; ++i) {
A(i, i) = 1;
A(i, i + spatial_dimension * size_of_shapes) = -1;
}
// compute traction. This call is not necessary for the linear
// cohesive law that, currently, is the only one used for the
// extrinsic approach.
// if (!model->getIsExtrinsic()){
// computeTraction(ghost_type);
//}
/// get the tangent matrix @f$\frac{\partial{(t/\delta)}}{\partial{\delta}}
/// @f$
Array<Real> * tangent_stiffness_matrix = new Array<Real>(
nb_element * nb_quadrature_points,
spatial_dimension * spatial_dimension, "tangent_stiffness_matrix");
// Array<Real> * normal = new Array<Real>(nb_element *
// nb_quadrature_points, spatial_dimension, "normal");
normal.resize(nb_quadrature_points);
computeNormal(model->getCurrentPosition(), normal, type, ghost_type);
/// compute openings @f$\mathbf{\delta}@f$
// computeOpening(model->getDisplacement(), opening(type, ghost_type), type,
// ghost_type);
tangent_stiffness_matrix->clear();
computeTangentTraction(type, *tangent_stiffness_matrix, normal, ghost_type);
// delete normal;
UInt size_at_nt_d_n_a = spatial_dimension * nb_nodes_per_element *
spatial_dimension * nb_nodes_per_element;
Array<Real> * at_nt_d_n_a = new Array<Real>(
nb_element * nb_quadrature_points, size_at_nt_d_n_a, "A^t*N^t*D*N*A");
Array<Real>::iterator<Vector<Real>> shapes_filt_it =
shapes_filtered->begin(size_of_shapes);
Array<Real>::matrix_iterator D_it =
tangent_stiffness_matrix->begin(spatial_dimension, spatial_dimension);
Array<Real>::matrix_iterator At_Nt_D_N_A_it =
at_nt_d_n_a->begin(spatial_dimension * nb_nodes_per_element,
spatial_dimension * nb_nodes_per_element);
Array<Real>::matrix_iterator At_Nt_D_N_A_end =
at_nt_d_n_a->end(spatial_dimension * nb_nodes_per_element,
spatial_dimension * nb_nodes_per_element);
Matrix<Real> N(spatial_dimension, spatial_dimension * size_of_shapes);
Matrix<Real> N_A(spatial_dimension,
spatial_dimension * nb_nodes_per_element);
Matrix<Real> D_N_A(spatial_dimension,
spatial_dimension * nb_nodes_per_element);
for (; At_Nt_D_N_A_it != At_Nt_D_N_A_end;
++At_Nt_D_N_A_it, ++D_it, ++shapes_filt_it) {
N.clear();
/**
* store the shapes in voigt notations matrix @f$\mathbf{N} =
* \begin{array}{cccccc} N_0(\xi) & 0 & N_1(\xi) &0 & N_2(\xi) & 0 \\
* 0 & * N_0(\xi)& 0 &N_1(\xi)& 0 & N_2(\xi) \end{array} @f$
**/
for (UInt i = 0; i < spatial_dimension; ++i)
for (UInt n = 0; n < size_of_shapes; ++n)
N(i, i + spatial_dimension * n) = (*shapes_filt_it)(n);
/**
* compute stiffness matrix @f$ \mathbf{K} = \delta \mathbf{U}^T
* \int_{\Gamma_c} {\mathbf{P}^t \frac{\partial{\mathbf{t}}}
*{\partial{\delta}}
* \mathbf{P} d\Gamma \Delta \mathbf{U}} @f$
**/
N_A.mul<false, false>(N, A);
D_N_A.mul<false, false>(*D_it, N_A);
(*At_Nt_D_N_A_it).mul<true, false>(D_N_A, N_A);
}
delete tangent_stiffness_matrix;
delete shapes_filtered;
Array<Real> * K_e = new Array<Real>(nb_element, size_at_nt_d_n_a, "K_e");
fem_cohesive.integrate(*at_nt_d_n_a, *K_e, size_at_nt_d_n_a, type,
ghost_type, elem_filter);
delete at_nt_d_n_a;
model->getDOFManager().assembleElementalMatricesToMatrix(
"K", "displacement", *K_e, type, ghost_type, _unsymmetric, elem_filter);
delete K_e;
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- *
* Compute traction from displacements
*
* @param[in] ghost_type compute the residual for _ghost or _not_ghost element
*/
void MaterialCohesive::computeTraction(GhostType ghost_type) {
AKANTU_DEBUG_IN();
#if defined(AKANTU_DEBUG_TOOLS)
debug::element_manager.printData(debug::_dm_material_cohesive,
"Cohesive Openings", opening);
#endif
for (auto & type : element_filter.elementTypes(spatial_dimension, ghost_type,
_ek_cohesive)) {
Array<UInt> & elem_filter = element_filter(type, ghost_type);
UInt nb_element = elem_filter.size();
if (nb_element == 0)
continue;
UInt nb_quadrature_points =
nb_element * fem_cohesive.getNbIntegrationPoints(type, ghost_type);
normal.resize(nb_quadrature_points);
/// compute normals @f$\mathbf{n}@f$
computeNormal(model->getCurrentPosition(), normal, type, ghost_type);
/// compute openings @f$\mathbf{\delta}@f$
computeOpening(model->getDisplacement(), opening(type, ghost_type), type,
ghost_type);
/// compute traction @f$\mathbf{t}@f$
computeTraction(normal, type, ghost_type);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MaterialCohesive::computeNormal(const Array<Real> & position,
Array<Real> & normal, ElementType type,
GhostType ghost_type) {
AKANTU_DEBUG_IN();
auto & fem_cohesive =
this->model->getFEEngineClass<MyFEEngineCohesiveType>("CohesiveFEEngine");
if (type == _cohesive_1d_2)
fem_cohesive.computeNormalsOnIntegrationPoints(position, normal, type,
ghost_type);
else {
#define COMPUTE_NORMAL(type) \
fem_cohesive.getShapeFunctions() \
.computeNormalsOnIntegrationPoints<type, CohesiveReduceFunctionMean>( \
position, normal, ghost_type, element_filter(type, ghost_type));
AKANTU_BOOST_COHESIVE_ELEMENT_SWITCH(COMPUTE_NORMAL);
#undef COMPUTE_NORMAL
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MaterialCohesive::computeOpening(const Array<Real> & displacement,
Array<Real> & opening, ElementType type,
GhostType ghost_type) {
AKANTU_DEBUG_IN();
auto & fem_cohesive =
this->model->getFEEngineClass<MyFEEngineCohesiveType>("CohesiveFEEngine");
#define COMPUTE_OPENING(type) \
fem_cohesive.getShapeFunctions() \
.interpolateOnIntegrationPoints<type, CohesiveReduceFunctionOpening>( \
displacement, opening, spatial_dimension, ghost_type, \
element_filter(type, ghost_type));
AKANTU_BOOST_COHESIVE_ELEMENT_SWITCH(COMPUTE_OPENING);
#undef COMPUTE_OPENING
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MaterialCohesive::computeEnergies() {
AKANTU_DEBUG_IN();
Vector<Real> b(spatial_dimension);
Vector<Real> h(spatial_dimension);
for (auto & type : element_filter.elementTypes(spatial_dimension, _not_ghost,
_ek_cohesive)) {
auto erev = reversible_energy(type, _not_ghost).begin();
auto etot = total_energy(type, _not_ghost).begin();
auto traction_it = tractions(type, _not_ghost).begin(spatial_dimension);
auto traction_old_it =
tractions_old(type, _not_ghost).begin(spatial_dimension);
auto opening_it = opening(type, _not_ghost).begin(spatial_dimension);
auto opening_old_it =
opening_old(type, _not_ghost).begin(spatial_dimension);
auto traction_end = tractions(type, _not_ghost).end(spatial_dimension);
/// loop on each quadrature point
for (; traction_it != traction_end; ++traction_it, ++traction_old_it,
++opening_it, ++opening_old_it, ++erev,
++etot) {
/// trapezoidal integration
b = *opening_it;
b -= *opening_old_it;
h = *traction_old_it;
h += *traction_it;
*etot += .5 * b.dot(h);
*erev = .5 * traction_it->dot(*opening_it);
}
}
/// update old values
GhostType ghost_type = _not_ghost;
for (auto & type : element_filter.elementTypes(spatial_dimension, _not_ghost,
_ek_cohesive)) {
tractions_old(type, ghost_type).copy(tractions(type, ghost_type));
opening_old(type, ghost_type).copy(opening(type, ghost_type));
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
Real MaterialCohesive::getReversibleEnergy() {
AKANTU_DEBUG_IN();
Real erev = 0.;
/// integrate reversible energy for each type of elements
for (auto & type : element_filter.elementTypes(spatial_dimension, _not_ghost,
_ek_cohesive)) {
erev +=
fem_cohesive.integrate(reversible_energy(type, _not_ghost), type,
_not_ghost, element_filter(type, _not_ghost));
}
AKANTU_DEBUG_OUT();
return erev;
}
/* -------------------------------------------------------------------------- */
Real MaterialCohesive::getDissipatedEnergy() {
AKANTU_DEBUG_IN();
Real edis = 0.;
/// integrate dissipated energy for each type of elements
for (auto & type : element_filter.elementTypes(spatial_dimension, _not_ghost,
_ek_cohesive)) {
Array<Real> dissipated_energy(total_energy(type, _not_ghost));
dissipated_energy -= reversible_energy(type, _not_ghost);
edis += fem_cohesive.integrate(dissipated_energy, type, _not_ghost,
element_filter(type, _not_ghost));
}
AKANTU_DEBUG_OUT();
return edis;
}
/* -------------------------------------------------------------------------- */
Real MaterialCohesive::getContactEnergy() {
AKANTU_DEBUG_IN();
Real econ = 0.;
/// integrate contact energy for each type of elements
for (auto & type : element_filter.elementTypes(spatial_dimension, _not_ghost,
_ek_cohesive)) {
auto & el_filter = element_filter(type, _not_ghost);
UInt nb_quad_per_el = fem_cohesive.getNbIntegrationPoints(type, _not_ghost);
UInt nb_quad_points = el_filter.size() * nb_quad_per_el;
Array<Real> contact_energy(nb_quad_points);
auto contact_traction_it =
contact_tractions(type, _not_ghost).begin(spatial_dimension);
auto contact_opening_it =
contact_opening(type, _not_ghost).begin(spatial_dimension);
/// loop on each quadrature point
for (UInt q = 0; q < nb_quad_points;
++contact_traction_it, ++contact_opening_it, ++q) {
contact_energy(q) = .5 * contact_traction_it->dot(*contact_opening_it);
}
econ += fem_cohesive.integrate(contact_energy, type, _not_ghost, el_filter);
}
AKANTU_DEBUG_OUT();
return econ;
}
/* -------------------------------------------------------------------------- */
Real MaterialCohesive::getEnergy(std::string type) {
AKANTU_DEBUG_IN();
if (type == "reversible")
return getReversibleEnergy();
else if (type == "dissipated")
return getDissipatedEnergy();
else if (type == "cohesive contact")
return getContactEnergy();
AKANTU_DEBUG_OUT();
return 0.;
}
/* -------------------------------------------------------------------------- */
} // namespace akantu
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