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rAKA/src/ntn_contact/friction_laws/ntn_friclaw_linear_cohesive_tmpl.hh
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ntn_friclaw_linear_cohesive_tmpl.hh
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/**
* @file ntn_friclaw_linear_cohesive_tmpl.hh
* @author David Kammer <david.kammer@epfl.ch>
* @date Thu Mar 20 15:23:39 2014
*
* @brief implementation of linear cohesive law
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 "dumper_text.hh"
__BEGIN_SIMTOOLS__
/* -------------------------------------------------------------------------- */
template <class Regularisation>
NTNFricLawLinearCohesive<Regularisation>::NTNFricLawLinearCohesive(NTNBaseContact * contact,
const FrictionID & id,
const MemoryID & memory_id) :
Regularisation(contact,id,memory_id),
G_c(0,1,0.,id+":G_c",0.,"G_c"),
tau_c(0,1,0.,id+":tau_c",0.,"tau_c"),
tau_r(0,1,0.,id+":tau_r",0.,"tau_r") {
AKANTU_DEBUG_IN();
Regularisation::registerSynchronizedArray(this->G_c);
Regularisation::registerSynchronizedArray(this->tau_c);
Regularisation::registerSynchronizedArray(this->tau_r);
this->registerParam("G_c", this->G_c, _pat_parsmod, "fracture energy");
this->registerParam("tau_c", this->tau_c, _pat_parsmod, "peak shear strength");
this->registerParam("tau_r", this->tau_r, _pat_parsmod, "residual shear strength");
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Regularisation>
void NTNFricLawLinearCohesive<Regularisation>::computeFrictionalStrength() {
AKANTU_DEBUG_IN();
SolidMechanicsModel & model = this->contact->getModel();
UInt dim = model.getSpatialDimension();
// get arrays
const SynchronizedArray<bool> & is_in_contact = this->internalGetIsInContact();
const SynchronizedArray<Real> & slip = this->internalGetSlip();
// array to fill
SynchronizedArray<Real> & strength = this->internalGetFrictionalStrength();
UInt nb_contact_nodes = this->contact->getNbContactNodes();
for (UInt n=0; n<nb_contact_nodes; ++n) {
// node pair is NOT in contact
if (!is_in_contact(n))
strength(n) = 0.;
// node pair is in contact
else {
if (this->G_c(n) == 0.) {
// strength(n) = 0.;
strength(n) = this->tau_r(n);
}
else {
Real slope = (this->tau_c(n) - this->tau_r(n)) * (this->tau_c(n) - this->tau_r(n)) / (2*this->G_c(n));
// no strength < tau_r
strength(n) = std::max(this->tau_c(n) - slope * slip(n), this->tau_r(n));
// strength(n) = std::max(this->tau_c(n) - slope * slip(n), 0.); // no negative strength
// if we want to keep strength loss after restick,
// we need to do min between new strength and previous strength
}
}
}
Regularisation::computeFrictionalStrength();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Regularisation>
void NTNFricLawLinearCohesive<Regularisation>::registerSynchronizedArray(SynchronizedArrayBase & array) {
AKANTU_DEBUG_IN();
this->G_c.registerDependingArray(array);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Regularisation>
void NTNFricLawLinearCohesive<Regularisation>::dumpRestart(const std::string & file_name) const {
AKANTU_DEBUG_IN();
this->G_c.dumpRestartFile(file_name);
this->tau_c.dumpRestartFile(file_name);
this->tau_r.dumpRestartFile(file_name);
Regularisation::dumpRestart(file_name);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Regularisation>
void NTNFricLawLinearCohesive<Regularisation>::readRestart(const std::string & file_name) {
AKANTU_DEBUG_IN();
this->G_c.readRestartFile(file_name);
this->tau_c.readRestartFile(file_name);
this->tau_r.readRestartFile(file_name);
Regularisation::readRestart(file_name);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Regularisation>
void NTNFricLawLinearCohesive<Regularisation>::printself(std::ostream & stream,
int indent) const {
AKANTU_DEBUG_IN();
std::string space;
for(Int i = 0; i < indent; i++, space += AKANTU_INDENT);
stream << space << "NTNFricLawLinearCohesive [" << std::endl;
Regularisation::printself(stream, ++indent);
stream << space << "]" << std::endl;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <class Regularisation>
void NTNFricLawLinearCohesive<Regularisation>::addDumpFieldToDumper(const std::string & dumper_name,
const std::string & field_id) {
AKANTU_DEBUG_IN();
#ifdef AKANTU_USE_IOHELPER
// const SynchronizedArray<UInt> * nodal_filter = &(this->contact->getSlaves());
if(field_id == "G_c") {
this->internalAddDumpFieldToDumper(dumper_name,
field_id,
new DumperIOHelper::NodalField<Real>(this->G_c.getArray()));
}
else if(field_id == "tau_c") {
this->internalAddDumpFieldToDumper(dumper_name,
field_id,
new DumperIOHelper::NodalField<Real>(this->tau_c.getArray()));
}
else if(field_id == "tau_r") {
this->internalAddDumpFieldToDumper(dumper_name,
field_id,
new DumperIOHelper::NodalField<Real>(this->tau_r.getArray()));
}
else {
Regularisation::addDumpFieldToDumper(dumper_name, field_id);
}
#endif
AKANTU_DEBUG_OUT();
}
__END_SIMTOOLS__
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