Vood strength analysis based on non destructive testing
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\Vood Strength Analysis Based on Non Destructive Testing
•
Lina Karlinasari, Surjono Surjokusumo,
Yusuf S. Hadi and N aresworo Nugroho
Department Forest Products, Faculty of Forestry, Bogor Agricultural University
Email: karlinasari@ipb.ac.id
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Strength wood analysis facilitates predicting residual strength. For the progress of
durability and service life of wooden constructions through appropriate maintenance, it
is important to detect deterioration, both physic and biology, of wooden constructions
members quantitati\'ely and precisely, and to accurately estimate/evaluate reductions in
mength. For this purpose. establishment of reliable and practical methods to evaluate
residual strength of wood is essential. These methods must be not only accurate but also
non destructi \e and practical.
The finite element method (FEM) with beam analysis was used successively to
simulate and model the fracture of wood (Launay, et aI., 2002; Vasic, Smith and Landis,
2005). The finite element method (FEM) is a numerical analysis technique used by
engineers. scientist. and mathematicians for solving which are described by partial
differential equation or can be formulated as functional minimization.
The objecti \e of this study is to obtain correlations between dynamic test by
ultrasonic (\10Ed) and static bending test (MOEs and MOR); and to analyze wood
strength obtained both non-destructi\'e and destructive testing through finite element
(FEM) approaches,
The pie-:es are boards, which is pattem as plank and small wood specimens. The
non-destructi\'c testing is developed through ultrasonic wave velocity measurement.
Determination of the mechanical propenies of wood by ultrasonic propagation is based
on the correlation bemeen the velocities of ultrasonic wave, the density and the MOE.
The ultrasonic yelocity is used to express the dynamic modulus of elasticity (MOEd).
Static bending test is done to determine the static modulus of elasticity (MOEs) and
modulus of rupture (\10R).
Relationship between MOEd and MOEs; MOEd and MOR are assessed to find
statistical correlation between statically and dynamically established moduli. Least
squares regression analyses are used in this study. Data from MOEd and MOEs are used
as input for stress analysis through FEM approaches. Bending stresses as a function of
design, can be assed. Beams
beam geometry and load location, which is useful for ｢ｾ｡ｭ＠
with v'lrious defect detected by ultrasonic velocity are modeled with the load present at
the center of the beam. The numerical model is used to analyze the effect inner
condition expressed by ultrasonic velocity on stresses. Some FEM software facilitates a
modeling of beam stress. such as Nastran and Abaqus software.
Key words: non-destructive testing, MOEd, MOEs, MOR, finite element method.
INTRODUCTORY P APER
Wood Strength Analysis Based on Non Destructive Testing
Lina Karlinasari, Surjono Surjokusumo, Yusuf .S. Hadi, Nareworo Nugroho
Department Forest Products, Faculty of Forestry, Bogor Agricultural University
Email: kllriinasariiai.ipb.ac.ig
I. INTRODUCTION
Background
Strength wood analysis facilitates predicting residual strength. For the
progress of durability and service life of wooden constructions through appropriate
maintenance, it is important to detect deterioration, both physic and biology, of
wooden constructions members quantitatively and precisely, and to accurately
estimate/evaluate reductions in strength. For this purpose, establishment of reliable
and practical methods to evaluate residual strength of wood is essential. These
methods must be not only accurate but also non destructive and practical.
The finite element method (FEM) with beam analysis was used successively
to simulate and model the fracture of wood (Launay, et aI., 2002; Vasic, Smith and
Landis, 2005). The finite element method (FEM) is a numerical analysis technique
used by engineers, scientist, and mathematicians for solving which are described by
partial differential equation or can be fonnulated as functional minimization. The
underlying premise of the method states that a complicated domain can be
ｳｵ｢ｾ＠
divided into a series of smaller regions in which the differential equations are
approximately solved. By assembling the set equations for each region, the behavior
over the entire problem domain is detennined (Nikishkov, 2004).
Objective
The objective of this study is to obtain correlations between dynamic test by
ultrasonic (MOEd) and static bending test (MOEs and MOR); and to analyze wood
strength obtained both non destructive and destructive testing through finite element
(FEM) approaches.
II. MATERIALS AND METHODS
Materials
The species studied are sengon (Paraseriathes !alcataria), durian (Durio
zibethinus Murr), and jati (Tectono grandis) representing low, medium and high
1
I'
INTRODUCTORY P APER
density. The pieces are boards which is pattern as plank and small wood specimens.
The dimension and geometry ofthe specimen is represented by Figure 1.
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. Wood Material
Towards
r.ClJIlOnn;
Harmolli;:atiol!
F urc.st Resources
\Vood Strength Analysis Based on Non Destructive Testing
•
Lina Karlinasari, Surjono Surjokusumo,
Yusuf S. Hadi and N aresworo Nugroho
Department Forest Products, Faculty of Forestry, Bogor Agricultural University
Email: karlinasari@ipb.ac.id
y
n
ｾｲ＠
e
4)
de
he
(5)
lre
rs.
(6)
(7)
to
the
lies
1 D.
(8)
we
. the
, the
, the
js is
that
1t of
Strength wood analysis facilitates predicting residual strength. For the progress of
durability and service life of wooden constructions through appropriate maintenance, it
is important to detect deterioration, both physic and biology, of wooden constructions
members quantitati\'ely and precisely, and to accurately estimate/evaluate reductions in
mength. For this purpose. establishment of reliable and practical methods to evaluate
residual strength of wood is essential. These methods must be not only accurate but also
non destructi \e and practical.
The finite element method (FEM) with beam analysis was used successively to
simulate and model the fracture of wood (Launay, et aI., 2002; Vasic, Smith and Landis,
2005). The finite element method (FEM) is a numerical analysis technique used by
engineers. scientist. and mathematicians for solving which are described by partial
differential equation or can be formulated as functional minimization.
The objecti \e of this study is to obtain correlations between dynamic test by
ultrasonic (\10Ed) and static bending test (MOEs and MOR); and to analyze wood
strength obtained both non-destructi\'e and destructive testing through finite element
(FEM) approaches,
The pie-:es are boards, which is pattem as plank and small wood specimens. The
non-destructi\'c testing is developed through ultrasonic wave velocity measurement.
Determination of the mechanical propenies of wood by ultrasonic propagation is based
on the correlation bemeen the velocities of ultrasonic wave, the density and the MOE.
The ultrasonic yelocity is used to express the dynamic modulus of elasticity (MOEd).
Static bending test is done to determine the static modulus of elasticity (MOEs) and
modulus of rupture (\10R).
Relationship between MOEd and MOEs; MOEd and MOR are assessed to find
statistical correlation between statically and dynamically established moduli. Least
squares regression analyses are used in this study. Data from MOEd and MOEs are used
as input for stress analysis through FEM approaches. Bending stresses as a function of
design, can be assed. Beams
beam geometry and load location, which is useful for ｢ｾ｡ｭ＠
with v'lrious defect detected by ultrasonic velocity are modeled with the load present at
the center of the beam. The numerical model is used to analyze the effect inner
condition expressed by ultrasonic velocity on stresses. Some FEM software facilitates a
modeling of beam stress. such as Nastran and Abaqus software.
Key words: non-destructive testing, MOEd, MOEs, MOR, finite element method.
INTRODUCTORY P APER
Wood Strength Analysis Based on Non Destructive Testing
Lina Karlinasari, Surjono Surjokusumo, Yusuf .S. Hadi, Nareworo Nugroho
Department Forest Products, Faculty of Forestry, Bogor Agricultural University
Email: kllriinasariiai.ipb.ac.ig
I. INTRODUCTION
Background
Strength wood analysis facilitates predicting residual strength. For the
progress of durability and service life of wooden constructions through appropriate
maintenance, it is important to detect deterioration, both physic and biology, of
wooden constructions members quantitatively and precisely, and to accurately
estimate/evaluate reductions in strength. For this purpose, establishment of reliable
and practical methods to evaluate residual strength of wood is essential. These
methods must be not only accurate but also non destructive and practical.
The finite element method (FEM) with beam analysis was used successively
to simulate and model the fracture of wood (Launay, et aI., 2002; Vasic, Smith and
Landis, 2005). The finite element method (FEM) is a numerical analysis technique
used by engineers, scientist, and mathematicians for solving which are described by
partial differential equation or can be fonnulated as functional minimization. The
underlying premise of the method states that a complicated domain can be
ｳｵ｢ｾ＠
divided into a series of smaller regions in which the differential equations are
approximately solved. By assembling the set equations for each region, the behavior
over the entire problem domain is detennined (Nikishkov, 2004).
Objective
The objective of this study is to obtain correlations between dynamic test by
ultrasonic (MOEd) and static bending test (MOEs and MOR); and to analyze wood
strength obtained both non destructive and destructive testing through finite element
(FEM) approaches.
II. MATERIALS AND METHODS
Materials
The species studied are sengon (Paraseriathes !alcataria), durian (Durio
zibethinus Murr), and jati (Tectono grandis) representing low, medium and high
1
I'
INTRODUCTORY P APER
density. The pieces are boards which is pattern as plank and small wood specimens.
The dimension and geometry ofthe specimen is represented by Figure 1.
..
L!
"
/I ..
..ｾ＠ . A
I..
tl
,
L
L
,
L
L
,
L
,
L
L
L
L
,
,
!
/'.
,. ,
1
/t
,,
I
,
','
,
\
Ｍｾ＠
8
em
/C::=::::> Cutting direction
A
,
..,. 30'CfIl..
'.'
>