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friction.hh
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/**
* @file friction.hh
* @author Alejandro M. Aragón <alejandro.aragon@epfl.ch>
* @date Mon Jan 23 09:00:00 2012
*
* @brief contact friction classes
*
* @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 __AKANTU_FRICTION_HH__
#define __AKANTU_FRICTION_HH__
#include <iostream>
#include <cmath>
#include "aka_common.hh"
__BEGIN_AKANTU__
using std::cout;
using std::endl;
enum Friction_type { Coulomb_t, Prakash_Clifton_t, Rate_state_t, Rice_t };
// base class for all contract friction concrete classes,
// used so that friction classes can be stored in a container
// if needed
struct Contact_friction_base {};
template <int>
class Contact_friction;
// partial template specialization for Coulomb friction
template <>
class Contact_friction<Coulomb_t> : public Contact_friction_base {
typedef Contact_friction_base base_type;
typedef Real value_type;
protected:
value_type mu_; // coefficient of friction
public:
Contact_friction() : base_type(), mu_() {}
Contact_friction(value_type mu) : base_type(), mu_(mu) {}
void setFriction(value_type mu)
{ mu_ = mu; }
value_type friction() const
{ return mu_; }
value_type computeForceMagnitude(value_type Pn)
{ return mu_*Pn; }
template <class vector_type>
value_type computeForceMagnitude(const vector_type& P) {
value_type norm = value_type();
for (int i=0; i<P.size(); ++i)
norm += pow(mu_*P[i], 2.);
return sqrt(norm);
}
};
__END_AKANTU__
#endif /* __AKANTU_FRICTION_HH__ */

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