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Sat, Aug 31, 14:52
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rAKA akantu
friction.hh
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/**
* @file friction.hh
*
* @author Alejandro M. Aragón <alejandro.aragon@epfl.ch>
*
* @date creation: Fri Jan 04 2013
* @date last modification: Sun Oct 19 2014
*
* @brief contact friction classes
*
* @section LICENSE
*
* Copyright (©) 2014, 2015 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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