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material_cohesive_linear_inline_impl.hh
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rAKA akantu
material_cohesive_linear_inline_impl.hh
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/**
* @file material_cohesive_linear_inline_impl.hh
*
* @author Mauro Corrado <mauro.corrado@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Wed Apr 22 2015
* @date last modification: Thu Jan 14 2021
*
* @brief Inline functions of the MaterialCohesiveLinear
*
*
* @section LICENSE
*
* Copyright (©) 2015-2021 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 "material_cohesive_linear.hh"
#include "solid_mechanics_model_cohesive.hh"
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_MATERIAL_COHESIVE_LINEAR_INLINE_IMPL_HH_
#define AKANTU_MATERIAL_COHESIVE_LINEAR_INLINE_IMPL_HH_
/* -------------------------------------------------------------------------- */
namespace
akantu
{
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
inline
Real
MaterialCohesiveLinear
<
dim
>::
computeEffectiveNorm
(
const
Matrix
<
Real
>
&
stress
,
const
Vector
<
Real
>
&
normal
,
const
Vector
<
Real
>
&
tangent
,
Vector
<
Real
>
&
normal_traction
)
const
{
normal_traction
.
mul
<
false
>
(
stress
,
normal
);
Real
normal_contrib
=
normal_traction
.
dot
(
normal
);
/// in 3D tangential components must be summed
Real
tangent_contrib
=
0
;
if
(
dim
==
2
)
{
Real
tangent_contrib_tmp
=
normal_traction
.
dot
(
tangent
);
tangent_contrib
+=
tangent_contrib_tmp
*
tangent_contrib_tmp
;
}
else
if
(
dim
==
3
)
{
for
(
UInt
s
=
0
;
s
<
dim
-
1
;
++
s
)
{
const
Vector
<
Real
>
tangent_v
(
tangent
.
storage
()
+
s
*
dim
,
dim
);
Real
tangent_contrib_tmp
=
normal_traction
.
dot
(
tangent_v
);
tangent_contrib
+=
tangent_contrib_tmp
*
tangent_contrib_tmp
;
}
}
tangent_contrib
=
std
::
sqrt
(
tangent_contrib
);
normal_contrib
=
std
::
max
(
Real
(
0.
),
normal_contrib
);
return
std
::
sqrt
(
normal_contrib
*
normal_contrib
+
tangent_contrib
*
tangent_contrib
*
beta2_inv
);
}
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
inline
void
MaterialCohesiveLinear
<
dim
>::
computeTractionOnQuad
(
Vector
<
Real
>
&
traction
,
Vector
<
Real
>
&
opening
,
const
Vector
<
Real
>
&
normal
,
Real
&
delta_max
,
const
Real
&
delta_c
,
const
Vector
<
Real
>
&
insertion_stress
,
const
Real
&
sigma_c
,
Vector
<
Real
>
&
normal_opening
,
Vector
<
Real
>
&
tangential_opening
,
Real
&
normal_opening_norm
,
Real
&
tangential_opening_norm
,
Real
&
damage
,
bool
&
penetration
,
Vector
<
Real
>
&
contact_traction
,
Vector
<
Real
>
&
contact_opening
)
{
/// compute normal and tangential opening vectors
normal_opening_norm
=
opening
.
dot
(
normal
);
normal_opening
=
normal
;
normal_opening
*=
normal_opening_norm
;
tangential_opening
=
opening
;
tangential_opening
-=
normal_opening
;
tangential_opening_norm
=
tangential_opening
.
norm
();
/**
* compute effective opening displacement
* @f$ \delta = \sqrt{
* \frac{\beta^2}{\kappa^2} \Delta_t^2 + \Delta_n^2 } @f$
*/
Real
delta
=
tangential_opening_norm
*
tangential_opening_norm
*
this
->
beta2_kappa2
;
penetration
=
normal_opening_norm
/
delta_c
<
-
Math
::
getTolerance
();
// penetration = normal_opening_norm < 0.;
if
(
not
this
->
contact_after_breaking
and
Math
::
are_float_equal
(
damage
,
1.
))
{
penetration
=
false
;
}
if
(
penetration
)
{
/// use penalty coefficient in case of penetration
contact_traction
=
normal_opening
;
contact_traction
*=
this
->
penalty
;
contact_opening
=
normal_opening
;
/// don't consider penetration contribution for delta
opening
=
tangential_opening
;
normal_opening
.
zero
();
}
else
{
delta
+=
normal_opening_norm
*
normal_opening_norm
;
contact_traction
.
zero
();
contact_opening
.
zero
();
}
delta
=
std
::
sqrt
(
delta
);
/// update maximum displacement and damage
delta_max
=
std
::
max
(
delta_max
,
delta
);
damage
=
std
::
min
(
delta_max
/
delta_c
,
Real
(
1.
));
/**
* Compute traction @f$ \mathbf{T} = \left(
* \frac{\beta^2}{\kappa} \Delta_t \mathbf{t} + \Delta_n
* \mathbf{n} \right) \frac{\sigma_c}{\delta} \left( 1-
* \frac{\delta}{\delta_c} \right)@f$
*/
if
(
Math
::
are_float_equal
(
damage
,
1.
))
{
traction
.
zero
();
}
else
if
(
Math
::
are_float_equal
(
damage
,
0.
))
{
if
(
penetration
)
{
traction
.
zero
();
}
else
{
traction
=
insertion_stress
;
}
}
else
{
traction
=
tangential_opening
;
traction
*=
this
->
beta2_kappa
;
traction
+=
normal_opening
;
AKANTU_DEBUG_ASSERT
(
delta_max
!=
0.
,
"Division by zero, tolerance might be too low"
);
traction
*=
sigma_c
/
delta_max
*
(
1.
-
damage
);
}
}
/* -------------------------------------------------------------------------- */
template
<
UInt
dim
>
inline
void
MaterialCohesiveLinear
<
dim
>::
computeTangentTractionOnQuad
(
Matrix
<
Real
>
&
tangent
,
Real
&
delta_max
,
const
Real
&
delta_c
,
const
Real
&
sigma_c
,
Vector
<
Real
>
&
opening
,
const
Vector
<
Real
>
&
normal
,
Vector
<
Real
>
&
normal_opening
,
Vector
<
Real
>
&
tangential_opening
,
Real
&
normal_opening_norm
,
Real
&
tangential_opening_norm
,
Real
&
damage
,
bool
&
penetration
,
Vector
<
Real
>
&
contact_opening
)
{
/**
* During the update of the residual the interpenetrations are
* stored in the array "contact_opening", therefore, in the case
* of penetration, in the array "opening" there are only the
* tangential components.
*/
opening
+=
contact_opening
;
/// compute normal and tangential opening vectors
normal_opening_norm
=
opening
.
dot
(
normal
);
normal_opening
=
normal
;
normal_opening
*=
normal_opening_norm
;
tangential_opening
=
opening
;
tangential_opening
-=
normal_opening
;
tangential_opening_norm
=
tangential_opening
.
norm
();
Real
delta
=
tangential_opening_norm
*
tangential_opening_norm
*
this
->
beta2_kappa2
;
penetration
=
normal_opening_norm
<
0.0
;
if
(
not
this
->
contact_after_breaking
and
Math
::
are_float_equal
(
damage
,
1.
))
{
penetration
=
false
;
}
Real
derivative
=
0
;
// derivative = d(t/delta)/ddelta
Real
t
=
0
;
Matrix
<
Real
>
n_outer_n
(
spatial_dimension
,
spatial_dimension
);
n_outer_n
.
outerProduct
(
normal
,
normal
);
if
(
penetration
)
{
/// stiffness in compression given by the penalty parameter
tangent
+=
n_outer_n
;
tangent
*=
penalty
;
opening
=
tangential_opening
;
normal_opening_norm
=
opening
.
dot
(
normal
);
normal_opening
=
normal
;
normal_opening
*=
normal_opening_norm
;
}
else
{
delta
+=
normal_opening_norm
*
normal_opening_norm
;
}
delta
=
std
::
sqrt
(
delta
);
/**
* Delta has to be different from 0 to have finite values of
* tangential stiffness. At the element insertion, delta =
* 0. Therefore, a fictictious value is defined, for the
* evaluation of the first value of K.
*/
if
(
delta
<
Math
::
getTolerance
())
{
delta
=
delta_c
/
1000.
;
}
if
(
delta
>=
delta_max
)
{
if
(
delta
<=
delta_c
)
{
derivative
=
-
sigma_c
/
(
delta
*
delta
);
t
=
sigma_c
*
(
1
-
delta
/
delta_c
);
}
else
{
derivative
=
0.
;
t
=
0.
;
}
}
else
if
(
delta
<
delta_max
)
{
Real
tmax
=
sigma_c
*
(
1
-
delta_max
/
delta_c
);
t
=
tmax
/
delta_max
*
delta
;
}
/// computation of the derivative of the constitutive law (dT/ddelta)
Matrix
<
Real
>
I
(
spatial_dimension
,
spatial_dimension
);
I
.
eye
(
this
->
beta2_kappa
);
Matrix
<
Real
>
nn
(
n_outer_n
);
nn
*=
(
1.
-
this
->
beta2_kappa
);
nn
+=
I
;
nn
*=
t
/
delta
;
Vector
<
Real
>
t_tilde
(
normal_opening
);
t_tilde
*=
(
1.
-
this
->
beta2_kappa2
);
Vector
<
Real
>
mm
(
opening
);
mm
*=
this
->
beta2_kappa2
;
t_tilde
+=
mm
;
Vector
<
Real
>
t_hat
(
normal_opening
);
t_hat
+=
this
->
beta2_kappa
*
tangential_opening
;
Matrix
<
Real
>
prov
(
spatial_dimension
,
spatial_dimension
);
prov
.
outerProduct
(
t_hat
,
t_tilde
);
prov
*=
derivative
/
delta
;
prov
+=
nn
;
Matrix
<
Real
>
prov_t
=
prov
.
transpose
();
tangent
+=
prov_t
;
}
/* -------------------------------------------------------------------------- */
}
// namespace akantu
/* -------------------------------------------------------------------------- */
#endif
// AKANTU_MATERIAL_COHESIVE_LINEAR_INLINE_IMPL_HH_
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