Journal of Marine Science and Engineering,
Journal Year:
2024,
Volume and Issue:
12(12), P. 2157 - 2157
Published: Nov. 26, 2024
This
paper
presents
numerical
investigations
into
the
free
vibration
properties
of
a
sandwich
composite
plate
with
two
fiber-reinforced
plastic
(FRP)
face
sheets
and
functionally
graded
carbon
nanotube-reinforced
(FG-CNTRC)
core
made
resting
on
Winkler/Pasternak
elastic
foundation.
The
material
FG-CNTRC
are
gradient
change
along
thickness
direction
four
distinct
nanotubes
reinforcement
distribution
patterns.
Hamilton
energy
concept
is
used
to
develop
equations
motion,
which
based
high-order
shear
deformation
theory
(HSDT).
Navier
method
then
obtain
solutions.
By
contrasting
acquired
results
those
using
finite
elements
previous
literature,
accuracy
present
approach
confirmed.
Moreover,
effects
modulus
elasticity,
nanotube
(CNT)
volume
fractions,
CNT
patterns,
index
p,
geometric
parameters
dimensionless
natural
frequencies’
basis
characteristics
examined.
show
that
has
higher
frequencies
than
(FGM)
or
plate.
And
fraction
other
factors
significantly
affect
frequency
Mechanics of Advanced Materials and Structures,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1 - 17
Published: Jan. 5, 2025
This
study
explores
free
vibration
of
a
rectangular
plate
composed
PU
closed-cell
foam
enhanced
with
GNPs
and
MWCNTs.
The
governing
motion
equations
are
derived
based
on
first
shear
deformation
theory
in
conjunction
Hamilton's
principle,
then
solved
by
finite
element
method.
Biot's
constitutive
law
for
poroelastic
behavior
is
utilized
place
conventional
Hooke's
to
consider
fluid-saturated
nature
pores.
In
contrast
majority
previous
studies
those
were
using
the
Halpin–Tsai
micromechanical
model,
which
presumes
an
unrealistic
ideal
uniform
distribution
nanofillers
within
matrix,
modified
model
used.
this
method,
leveraging
existing
experimental
data
employing
GA,
exponential
shape
factor
parameter
corresponding
different
GNP
MWCNT
ratios
determined
achieve
best
R-squared
fit
data.
Comprehensive
analysis
various
parameters
undertaken,
encompassing
geometric
parameters,
porosity
across
patterns
boundary
conditions.
Furthermore,
considers
influence
weight
fraction,
diverse
ratios,
reinforcement
pattern.
obtained
results
showed
that
increasing
coefficient
from
0
0.9,
natural
frequency
reduced
about
36.5%,
regardless
reinforcement.
addition,
Skempton
increased
5.3%.
Also,
caused
greatest
decrease
frequency,
dropping
36.3%
as
0.9.
Polymer Composites,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 12, 2025
Abstract
Damped
sandwich
composite
structures
are
increasingly
used
in
the
aerospace,
automotive
and
energy
sectors
due
to
their
high
damping
lightweight
properties.
Here,
a
novel
porous
fiber‐reinforced
structure
is
proposed,
by
punching
holes
fiber
cloth
with
impregnated
solution,
resin
flows
through
during
formation
of
structure,
connecting
upper
lower
prepreg
layers.
This
paper
focuses
on
theoretical
study
free
vibration
behavior
simply
supported
multilayer
arbitrary
delamination
angles.
The
vibrational
differential
equation
including
orientation
angle
was
established
solved
using
Rayleigh‐Ritz
method
Navier
method.
Subsequently,
Abaqus
finite
element
modal
test
analysis
were
evaluate
dynamic
performance
different
angles,
verify
proposed
model
solution
strategy,
perform
structural
optimization
based
genetic
algorithm.
results
show
that
panel
area
ratio
layer
94.854%
multiples
45°
has
excellent
performance.
significant
advantages
improving
stiffness
provides
basis
for
practical
engineering
applications.
Highlights
A
plate
established.
effect
studied.
An
experimental
platform
constructed
corroborate
accuracy.
Structural
conducted
influence
parameters
analyzed.
