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rAKA/ntn_contact/friction_laws/ntn_friction_linear_slip_weakening.cc
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ntn_friction_linear_slip_weakening.cc
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/**
* @file ntn_friction_linear_slip_weakening.cc
* @author David Kammer <david.kammer@epfl.ch>
* @date Tue Nov 20 15:02:59 2012
*
* @brief
*
* @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 "ntn_friction_linear_slip_weakening.hh"
__BEGIN_SIMTOOLS__
/* -------------------------------------------------------------------------- */
NTNFrictionLinearSlipWeakening::NTNFrictionLinearSlipWeakening(NTNContact & contact,
const FrictionID & id,
const MemoryID & memory_id) :
NTNFrictionCoulomb(contact,id,memory_id),
weakening_length(0,1,0.,id+":weakening_length",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"),
slip(0,1,0.,id+":slip",0.,"slip") {
AKANTU_DEBUG_IN();
NTNFrictionCoulomb::registerSynchronizedArray(this->weakening_length);
NTNFrictionCoulomb::registerSynchronizedArray(this->mu_s);
NTNFrictionCoulomb::registerSynchronizedArray(this->mu_k);
NTNFrictionCoulomb::registerSynchronizedArray(this->slip);
// set increment flag of solid mechanics model on
contact.getModel().setIncrementFlagOn();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::computeFrictionCoefficient() {
AKANTU_DEBUG_IN();
SolidMechanicsModel & model = this->contact.getModel();
UInt dim = model.getSpatialDimension();
UInt nb_ntn_pairs = this->contact.getNbContactNodes();
// compute tangential gap
Array<Real> rel_tan_incr(0,dim);
this->contact.computeRelativeTangentialField(model.getIncrement(),
rel_tan_incr);
AKANTU_DEBUG_ASSERT(rel_tan_incr.getSize() == nb_ntn_pairs,
"computeRelativeNormalField does not give back arrays "
<< "size == nb_ntn_pairs. nb_ntn_pairs = " << nb_ntn_pairs
<< " | array size = " << rel_tan_incr.getSize());
Real * rel_tan_incr_p = rel_tan_incr.storage();
for (UInt n=0; n<nb_ntn_pairs; ++n) {
if (this->is_sticking(n)) {
// reset tangential gap to zero
this->slip(n) = 0.;
this->mu(n) = this->mu_s(n);
}
else {
Real abs_incr = Math::norm(dim, &(rel_tan_incr_p[n*dim]));
this->slip(n) += abs_incr;
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 NTNFrictionLinearSlipWeakening::computeFrictionalStrength() {
AKANTU_DEBUG_IN();
computeFrictionCoefficient();
NTNFrictionCoulomb::computeFrictionalStrength();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::registerSynchronizedArray(SynchronizedArrayBase & array) {
AKANTU_DEBUG_IN();
this->weakening_length.registerDependingArray(array);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::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);
this->slip.dumpRestartFile(file_name);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::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);
this->slip.readRestartFile(file_name);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::setMuS(Real mu) {
AKANTU_DEBUG_IN();
NTNFriction::setInternalArray(this->mu_s, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::setMuS(UInt node, Real mu) {
AKANTU_DEBUG_IN();
NTNFriction::setInternalArray(this->mu_s, node, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::setMuK(Real mu) {
AKANTU_DEBUG_IN();
NTNFriction::setInternalArray(this->mu_k, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::setMuK(UInt node, Real mu) {
AKANTU_DEBUG_IN();
NTNFriction::setInternalArray(this->mu_k, node, mu);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::setWeakeningLength(Real length) {
AKANTU_DEBUG_IN();
NTNFriction::setInternalArray(this->weakening_length, length);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::setWeakeningLength(UInt node, Real length) {
AKANTU_DEBUG_IN();
NTNFriction::setInternalArray(this->weakening_length, node, length);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTNFrictionLinearSlipWeakening::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 << "NTNFrictionLinearSlipWeakening [" << std::endl;
NTNFrictionCoulomb::printself(stream, indent+1);
stream << space << this->mu_s << std::endl;
stream << space << this->mu_k << std::endl;
stream << space << "]" << std::endl;
AKANTU_DEBUG_OUT();
}
__END_SIMTOOLS__
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