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rAKA/ntrf_contact/friction_laws/ntrf_friction_linear_slip_weakening.cc
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ntrf_friction_linear_slip_weakening.cc
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/**
* @file ntrf_friction_linear_slip_weakening.cc
* @author David Kammer <david.kammer@epfl.ch>
* @date Mon May 13 17:12:09 2013
*
* @brief implementation of linear slip weakening ntrf friction
*
* @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/>.
*
*/
/* -------------------------------------------------------------------------- */
// simtools
#include "ntrf_friction_linear_slip_weakening.hh"
__BEGIN_SIMTOOLS__
/* -------------------------------------------------------------------------- */
NTRFFrictionLinearSlipWeakening::NTRFFrictionLinearSlipWeakening(NTRFContact & contact,
const FrictionID & id,
const MemoryID & memory_id) :
NTRFFrictionRegularizedCoulomb(contact,id,memory_id),
weakening_length(0,1,0.,id+":weakening_lingth",0.,"weakening_length"),
mu_s(0,1,0.,id+":mu_s",0.,"mu_s"),
mu_k(0,1,0.,id+":mu_k",0.,"mu_k") {
AKANTU_DEBUG_IN();
NTRFFrictionRegularizedCoulomb::registerSynchronizedArray(this->weakening_length);
NTRFFrictionRegularizedCoulomb::registerSynchronizedArray(this->mu_s);
NTRFFrictionRegularizedCoulomb::registerSynchronizedArray(this->mu_k);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::computeFrictionCoefficient() {
AKANTU_DEBUG_IN();
SolidMechanicsModel & model = this->contact.getModel();
UInt dim = model.getSpatialDimension();
UInt nb_ntn_pairs = this->contact.getNbContactNodes();
for (UInt n=0; n<nb_ntn_pairs; ++n) {
if (this->is_sticking(n)) {
this->mu(n) = this->mu_s(n);
}
else {
if (this->slip(n) >= this->weakening_length(n)) {
this->mu(n) = this->mu_k(n);
}
else {
// mu = mu_k + (1 - delta / Dc) * (mu_s - mu_k)
Real delta = this->slip(n) - this->weakening_length(n);
delta /= this->weakening_length(n);
this->mu(n) = this->mu_k(n) + (1 - delta) * (this->mu_s(n) - this->mu_k(n));
}
}
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::computeFrictionalStrength() {
AKANTU_DEBUG_IN();
computeFrictionCoefficient();
NTRFFrictionRegularizedCoulomb::computeFrictionalStrength();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::registerSynchronizedArray(SynchronizedArrayBase & array) {
AKANTU_DEBUG_IN();
this->weakening_length.registerDependingArray(array);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::dumpRestart(const std::string & file_name) const {
AKANTU_DEBUG_IN();
this->weakening_length.dumpRestartFile(file_name);
this->mu_s.dumpRestartFile(file_name);
this->mu_k.dumpRestartFile(file_name);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::readRestart(const std::string & file_name) {
AKANTU_DEBUG_IN();
this->weakening_length.readRestartFile(file_name);
this->mu_s.readRestartFile(file_name);
this->mu_k.readRestartFile(file_name);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::setMuS(Real mu) {
AKANTU_DEBUG_IN();
NTRFFriction::setInternalArray(this->mu_s, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::setMuS(UInt node, Real mu) {
AKANTU_DEBUG_IN();
NTRFFriction::setInternalArray(this->mu_s, node, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::setMuK(Real mu) {
AKANTU_DEBUG_IN();
NTRFFriction::setInternalArray(this->mu_k, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::setMuK(UInt node, Real mu) {
AKANTU_DEBUG_IN();
NTRFFriction::setInternalArray(this->mu_k, node, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::setWeakeningLength(Real length) {
AKANTU_DEBUG_IN();
NTRFFriction::setInternalArray(this->weakening_length, length);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::setWeakeningLength(UInt node, Real length) {
AKANTU_DEBUG_IN();
NTRFFriction::setInternalArray(this->weakening_length, node, length);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::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 << "NTRFFrictionLinearSlipWeakening [" << std::endl;
NTRFFrictionRegularizedCoulomb::printself(stream, indent+1);
stream << space << this->weakening_length << std::endl;
stream << space << this->mu_s << std::endl;
stream << space << this->mu_k << std::endl;
stream << space << "]" << std::endl;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFFrictionLinearSlipWeakening::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 == "mu_static") {
this->internalAddDumpFieldToDumper(dumper_name,
field_id,
new DumperIOHelper::NodalField<Real>(this->mu_s.getArray()));
}
else if(field_id == "mu_kinetic") {
this->internalAddDumpFieldToDumper(dumper_name,
field_id,
new DumperIOHelper::NodalField<Real>(this->mu_k.getArray()));
}
else if(field_id == "weakening_length") {
this->internalAddDumpFieldToDumper(dumper_name,
field_id,
new DumperIOHelper::NodalField<Real>(this->weakening_length.getArray()));
}
else {
NTRFFrictionRegularizedCoulomb::addDumpFieldToDumper(dumper_name, field_id);
}
#endif
AKANTU_DEBUG_OUT();
}
__END_SIMTOOLS__
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