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ntn_friction.hh
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ntn_friction.hh
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/**
* @file ntn_friction.hh
* @author David Kammer <david.kammer@epfl.ch>
* @date Wed Feb 22 11:40:08 2012
*
* @brief implementation of friction for node to node contact
*
* @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/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef __AST_NTN_FRICTION_HH__
#define __AST_NTN_FRICTION_HH__
/* -------------------------------------------------------------------------- */
// simtools
#include "ntn_contact.hh"
__BEGIN_SIMTOOLS__
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
class NTNFriction : protected Memory {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
NTNFriction(NTNContact & contact,
const FrictionID & id = "friction",
const MemoryID & memory_id = 0);
virtual ~NTNFriction() {};
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
/// compute friction traction
virtual void computeFrictionTraction();
/// compute stick traction (friction traction needed to stick the nodes)
void computeStickTraction();
/// apply the friction force
void applyFrictionTraction();
/// register Syncronizedarrays for sync
virtual void registerSyncronizedArray(SyncronizedArrayBase & array);
/// dump restart file
virtual void dumpRestart(std::string file_name) const;
/// read restart file
virtual void readRestart(std::string file_name);
/// function to print the contain of the class
virtual void printself(std::ostream & stream, int indent = 0) const;
protected:
/// compute frictional strength according to friction law
virtual void computeFrictionalStrength() = 0;
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
AKANTU_GET_MACRO(Contact, contact, const NTNContact &)
AKANTU_GET_MACRO(IsSticking, is_sticking, const SyncronizedArray<bool> &)
AKANTU_GET_MACRO(FrictionalStrength, frictional_strength, const SyncronizedArray<Real> &)
AKANTU_GET_MACRO(FrictionTraction, friction_traction, const SyncronizedArray<Real> &)
// set friction coefficient to all nodes
//void setMu(Real mu);
// set friction coefficient only to node (global index)
//void setMu(UInt node, Real mu);
protected:
void setInternalArray(SyncronizedArray<Real> & array, Real value);
void setInternalArray(SyncronizedArray<Real> & array, UInt node, Real value);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
FrictionID id;
NTNContact & contact;
// if node is sticking
SyncronizedArray<bool> is_sticking;
// frictional strength
SyncronizedArray<Real> frictional_strength;
// friction force
SyncronizedArray<Real> friction_traction;
// friction coefficient
//SyncronizedArray<Real> mu;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
//#include "ntn_friction_inline_impl.cc"
/// standard output stream operator
inline std::ostream & operator <<(std::ostream & stream, const NTNFriction & _this)
{
_this.printself(stream);
return stream;
}
__END_SIMTOOLS__
#endif /* __AST_NTN_FRICTION_HH__ */

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