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/**
* @file simplified_dieterich_fric_coef.hh
* @author David Kammer <david.kammer@epfl.ch>
* @date Fri Mar 4 14:51:28 2011
*
* @brief implementation of a friction coefficient based on the simpliefied dieterich law \mu = \mu_0 + A \ln\left( \frac{V}{V^*} + 1\right) + B \ln \left( \frac{\theta}{\theta^*} + 1 \right) (see Dieterich & Kilgore 1994)
*
* @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_SIMPLIFIED_DIETERICH_FRIC_COEF_HH__
#define __AKANTU_SIMPLIFIED_DIETERICH_FRIC_COEF_HH__
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "contact_rigid.hh"
#include "friction_coefficient.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_AKANTU__
class SimplifiedDieterichFricCoef : public FrictionCoefficient {
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
SimplifiedDieterichFricCoef(ContactRigid & contact,
const Surface & master_surface);
virtual ~SimplifiedDieterichFricCoef();
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
virtual void setParam(const std::string & key, const std::string & value);
/// compute the relative sliding velocity
virtual void initializeComputeFricCoef();
/// implementation of the friction coefficient formula
inline Real computeFricCoef(UInt impactor_node_index);
/// function to print the contain of the class
//virtual void printself(std::ostream & stream, int indent = 0) const;
private:
// computes the tangential velocity of the master element
void computeTangentialMasterVelocity(UInt impactor_index,
ContactRigid::ImpactorInformationPerMaster * impactor_info,
Real * tangential_master_velocity);
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected:
/// spatial dimension of contact
Real spatial_dimension;
/// /mu_0, the reference friction coefficient
Real mu_zero;
/// A, the factor of the rate term
Real a_factor;
/// B, the factor of the state term
Real b_factor;
/// The velocity normalizing constant
Real v_normalizer;
/// The state normalizing constant
Real theta_normalizer;
/// relative sliding velocities for each active impactor node
Vector<Real> * relative_sliding_velocities;
/// state for each active impactor node
Vector<Real> * theta_state_variables;
};
/* -------------------------------------------------------------------------- */
/* inline functions */
/* -------------------------------------------------------------------------- */
#include "simplified_dieterich_fric_coef_inline_impl.cc"
/*
/// standard output stream operator
inline std::ostream & operator <<(std::ostream & stream, const SimplifiedDieterichFricCoef & _this)
{
_this.printself(stream);
return stream;
}
*/
__END_AKANTU__
#endif /* __AKANTU_SIMPLIFIED_DIETERICH_FRIC_COEF_HH__ */
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