Page 75 - Kutnar, Andreja, et al., eds., 2015. Proceedings of the 1st COST Action FP1307 International Conference - Life Cycle Assessment, EPDs, and modified wood. University of Primorska Press, Koper.
P. 75
racterization
of
cracked
wood
under
thermo-‐hydro-‐mechanical
and
viscoelastic
behaviour
Seif
Eddine
Hamdi1,2,
Rostand
Moutou
Pitti1,2,3
1
Université
Clermont
Auvergne,
Université
Blaise
Pascal,
Institut
Pascal,
BP
10448,
63000,
Clermont-‐Ferrand,
France,
email:
rostand.moutou_pitti@univ-‐bpclermont.fr,
Seif_Eddine.HAMDI@univ-‐bpclermont.fr
2
CNRS,
UMR
6602,
Institut
Pascal,
63171,
Aubière,
France
3
IRT,
CENAREST,
BP-‐14070
Libreville,
Gabon,
email:
rostand.moutou_pitti@univ-‐
bpclermont.fr
Keywords:
Crack,
wood
modification,
moisture
content,
independent
integral,
finite
element
Cracks
in
wood
and
timber
structures
are
due
to
mechanical
loading,
but
also
to
environmental
effects
such
as
temperature
and
humidity.
In
this
case,
controlling
the
shrinkage
or
the
swelling
during
the
wood
life
are
one
of
the
challenges
of
the
scientists
and
the
engineering
community
in
order
to
limit
the
apparition
of
micro-‐cracks
at
their
propagation
(Moutou
Pitti
et
al.
2013).
In
addition,
the
effects
of
moisture
content
variation
coupled
with
viscoelasticity
effect
generate
more
deformations
detrimental
to
timber
structures
in
service
(Moutou
Pitti
et
al.
2014).
This
work
examines
crack
propagation
in
wood
due
to
mechanical
and
moisture
content
variation.
The
crack
extension
is
introduced
by
the
non-‐dependent
integral
!
(Riahi
et
al.
2015)
combining
real
and
virtual
fields
in
viscoelastic
material
introduced
by
a
generalized
Kelvin
Voigt
model.
The
mixed
Mode
Crack
Growth
(MMCG)
specimen
subjected
to
moisture
variation,
as
depicted
in
Fig.1,
is
used
in
order
to
obtain
the
mixed
mode
configuration
during
the
crack
growth
process.
(a) (b) (c)
Figure
1:
Wood
specimen
in
Exx
(a)
Eyy
(b)
directions.
(c)
Real
MMCG
specimen
63
of
cracked
wood
under
thermo-‐hydro-‐mechanical
and
viscoelastic
behaviour
Seif
Eddine
Hamdi1,2,
Rostand
Moutou
Pitti1,2,3
1
Université
Clermont
Auvergne,
Université
Blaise
Pascal,
Institut
Pascal,
BP
10448,
63000,
Clermont-‐Ferrand,
France,
email:
rostand.moutou_pitti@univ-‐bpclermont.fr,
Seif_Eddine.HAMDI@univ-‐bpclermont.fr
2
CNRS,
UMR
6602,
Institut
Pascal,
63171,
Aubière,
France
3
IRT,
CENAREST,
BP-‐14070
Libreville,
Gabon,
email:
rostand.moutou_pitti@univ-‐
bpclermont.fr
Keywords:
Crack,
wood
modification,
moisture
content,
independent
integral,
finite
element
Cracks
in
wood
and
timber
structures
are
due
to
mechanical
loading,
but
also
to
environmental
effects
such
as
temperature
and
humidity.
In
this
case,
controlling
the
shrinkage
or
the
swelling
during
the
wood
life
are
one
of
the
challenges
of
the
scientists
and
the
engineering
community
in
order
to
limit
the
apparition
of
micro-‐cracks
at
their
propagation
(Moutou
Pitti
et
al.
2013).
In
addition,
the
effects
of
moisture
content
variation
coupled
with
viscoelasticity
effect
generate
more
deformations
detrimental
to
timber
structures
in
service
(Moutou
Pitti
et
al.
2014).
This
work
examines
crack
propagation
in
wood
due
to
mechanical
and
moisture
content
variation.
The
crack
extension
is
introduced
by
the
non-‐dependent
integral
!
(Riahi
et
al.
2015)
combining
real
and
virtual
fields
in
viscoelastic
material
introduced
by
a
generalized
Kelvin
Voigt
model.
The
mixed
Mode
Crack
Growth
(MMCG)
specimen
subjected
to
moisture
variation,
as
depicted
in
Fig.1,
is
used
in
order
to
obtain
the
mixed
mode
configuration
during
the
crack
growth
process.
(a) (b) (c)
Figure
1:
Wood
specimen
in
Exx
(a)
Eyy
(b)
directions.
(c)
Real
MMCG
specimen
63
