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solid_mechanics_model_cohesive_inline_impl.cc
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/**
* @file solid_mechanics_model_cohesive_inline_impl.cc
*
* @author Mauro Corrado <mauro.corrado@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Fri Jan 18 2013
* @date last modification: Thu Jan 14 2016
*
* @brief Implementation of inline functions for the Cohesive element model
*
* @section LICENSE
*
* Copyright (©) 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 <algorithm>
#include "material_cohesive.hh"
#ifndef __AKANTU_SOLID_MECHANICS_MODEL_COHESIVE_INLINE_IMPL_CC__
#define __AKANTU_SOLID_MECHANICS_MODEL_COHESIVE_INLINE_IMPL_CC__
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
template<SolveConvergenceMethod cmethod, SolveConvergenceCriteria criteria>
bool SolidMechanicsModelCohesive::solveStepCohesive(Real tolerance,
Real & error,
UInt max_iteration,
bool load_reduction,
Real tol_increase_factor,
bool do_not_factorize) {
EventManager::sendEvent(SolidMechanicsModelEvent::BeforeSolveStepEvent(method));
this->implicitPred();
bool insertion_new_element = true;
bool converged = false;
Array<Real> * displacement_tmp = NULL;
Array<Real> * velocity_tmp = NULL;
Array<Real> * acceleration_tmp = NULL;
StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();
Int prank = comm.whoAmI();
/// Loop for the insertion of new cohesive elements
while (insertion_new_element) {
if (is_extrinsic) {
/// If in extrinsic the solution of the previous incremental
/// step is saved in temporary arrays created for displacements,
/// velocities and accelerations. Such arrays are used to find
/// the solution with the Newton-Raphson scheme (this is done by
/// pointing the pointer "displacement" to displacement_tmp). In
/// this way, inside the array "displacement" is kept the
/// solution of the previous incremental step, and in
/// "displacement_tmp" is saved the current solution.
Array<Real> * tmp_swap;
if(!displacement_tmp) {
displacement_tmp = new Array<Real>(*(this->displacement));
} else {
displacement_tmp->resize(this->displacement->getSize());
displacement_tmp->copy(*(this->displacement));
}
tmp_swap = displacement_tmp;
displacement_tmp = this->displacement;
this->displacement = tmp_swap;
if(!velocity_tmp) {
velocity_tmp = new Array<Real>(*(this->velocity));
} else {
velocity_tmp->resize(this->velocity->getSize());
velocity_tmp->copy(*(this->velocity));
}
tmp_swap = velocity_tmp;
velocity_tmp = this->velocity;
this->velocity = tmp_swap;
if(!acceleration_tmp) {
acceleration_tmp = new Array<Real>(*(this->acceleration));
} else {
acceleration_tmp->resize(this->acceleration->getSize());
acceleration_tmp->copy(*(this->acceleration));
}
tmp_swap = acceleration_tmp;
acceleration_tmp = this->acceleration;
this->acceleration = tmp_swap;
}
this->updateResidual();
AKANTU_DEBUG_ASSERT(stiffness_matrix != NULL,
"You should first initialize the implicit solver and assemble the stiffness matrix");
bool need_factorize = !do_not_factorize;
if (method ==_implicit_dynamic) {
AKANTU_DEBUG_ASSERT(mass_matrix != NULL,
"You should first initialize the implicit solver and assemble the mass matrix");
}
switch (cmethod) {
case _scm_newton_raphson_tangent:
case _scm_newton_raphson_tangent_not_computed:
break;
case _scm_newton_raphson_tangent_modified:
this->assembleStiffnessMatrix();
break;
default:
AKANTU_DEBUG_ERROR("The resolution method " << cmethod << " has not been implemented!");
}
UInt iter = 0;
converged = false;
error = 0.;
if(criteria == _scc_residual) {
converged = this->testConvergence<criteria> (tolerance, error);
if(converged) return converged;
}
/// Loop to solve the nonlinear system
do {
if (cmethod == _scm_newton_raphson_tangent)
this->assembleStiffnessMatrix();
solve<NewmarkBeta::_displacement_corrector> (*increment, 1., need_factorize);
this->implicitCorr();
this->updateResidual();
converged = this->testConvergence<criteria> (tolerance, error);
iter++;
AKANTU_DEBUG_INFO("[" << criteria << "] Convergence iteration "
<< std::setw(std::log10(max_iteration)) << iter
<< ": error " << error << (converged ? " < " : " > ") << tolerance);
switch (cmethod) {
case _scm_newton_raphson_tangent:
need_factorize = true;
break;
case _scm_newton_raphson_tangent_not_computed:
case _scm_newton_raphson_tangent_modified:
need_factorize = false;
break;
default:
AKANTU_DEBUG_ERROR("The resolution method " << cmethod << " has not been implemented!");
}
} while (!converged && iter < max_iteration);
/// This is to save the obtained result and proceed with the
/// simulation even if the error is higher than the pre-fixed
/// tolerance. This is done only after loading reduction
/// (load_reduction = true).
if (load_reduction && (error < tolerance * tol_increase_factor)) converged = true;
if (converged) {
// EventManager::sendEvent(SolidMechanicsModelEvent::AfterSolveStepEvent(method));
// !!! add sendEvent to call computeCauchyStress !!!!
if (prank==0){
std::cout << "Error after convergence: " << error << std::endl;
std::cout << "no. of iterations: " << iter << std::endl;
}
} else if(iter == max_iteration) {
if (prank==0){
AKANTU_DEBUG_WARNING("[" << criteria << "] Convergence not reached after "
<< std::setw(std::log10(max_iteration)) << iter <<
" iteration" << (iter == 1 ? "" : "s") << "!" << std::endl);
std::cout << "Error after NON convergence: " << error << std::endl;
}
}
if (is_extrinsic) {
/// If is extrinsic the pointer "displacement" is moved back to
/// the array displacement. In this way, the array displacement
/// is correctly resized during the checkCohesiveStress function
/// (in case new cohesive elements are added). This is possible
/// because the procedure called by checkCohesiveStress does not
/// use the displacement field (the correct one is now stored in
/// displacement_tmp), but directly the stress field that is
/// already computed.
Array<Real> * tmp_swap;
tmp_swap = displacement_tmp;
displacement_tmp = this->displacement;
this->displacement = tmp_swap;
tmp_swap = velocity_tmp;
velocity_tmp = this->velocity;
this->velocity = tmp_swap;
tmp_swap = acceleration_tmp;
acceleration_tmp = this->acceleration;
this->acceleration = tmp_swap;
/// If convergence is reached, call checkCohesiveStress in order
/// to check if cohesive elements have to be introduced
if (converged){
UInt new_cohesive_elements = checkCohesiveStress();
if(new_cohesive_elements == 0){
insertion_new_element = false;
} else {
insertion_new_element = true;
if (prank==0)
std::cout << "No. cohesive elements inserted = " << new_cohesive_elements << std::endl;
}
}
}
if (!converged && load_reduction)
insertion_new_element = false;
/// If convergence is not reached, there is the possibility to
/// return back to the main file and reduce the load. Before doing
/// this, a pre-fixed value as to be defined for the parameter
/// delta_max of the cohesive elements introduced in the current
/// incremental step. This is done by calling the function
/// checkDeltaMax.
if (!converged) {
insertion_new_element = false;
for (UInt m = 0; m < materials.size(); ++m) {
try {
MaterialCohesive & mat = dynamic_cast<MaterialCohesive &>(*materials[m]);
mat.checkDeltaMax(_not_ghost);
} catch(std::bad_cast&) { }
}
}
} //end loop for the insertion of new cohesive elements
/// When the solution to the current incremental step is computed
/// (no more cohesive elements have to be introduced), call the
/// function to compute the energies.
if ((is_extrinsic && converged)) {
for(UInt m = 0; m < materials.size(); ++m) {
try {
MaterialCohesive & mat = dynamic_cast<MaterialCohesive &>(*materials[m]);
mat.computeEnergies();
} catch (std::bad_cast & bce) { }
}
EventManager::sendEvent(SolidMechanicsModelEvent::AfterSolveStepEvent(method));
/// The function resetVariables is necessary to correctly set a
/// variable that permit to decrease locally the penalty parameter
/// for compression.
for (UInt m = 0; m < materials.size(); ++m) {
try {
MaterialCohesive & mat = dynamic_cast<MaterialCohesive &>(*materials[m]);
mat.resetVariables(_not_ghost);
} catch(std::bad_cast&) { }
}
/// The correct solution is saved
this->displacement->copy(*displacement_tmp);
this->velocity ->copy(*velocity_tmp);
this->acceleration->copy(*acceleration_tmp);
delete displacement_tmp;
delete velocity_tmp;
delete acceleration_tmp;
}
return insertion_new_element;
}
__END_AKANTU__
#if defined (AKANTU_PARALLEL_COHESIVE_ELEMENT)
# include "solid_mechanics_model_cohesive_parallel_inline_impl.cc"
#endif
#endif /* __AKANTU_SOLID_MECHANICS_MODEL_COHESIVE_INLINE_IMPL_CC__ */

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