Journal of Intelligent Material Systems and Structures,
Journal Year:
2024,
Volume and Issue:
35(13), P. 1101 - 1118
Published: July 25, 2024
The
vibration
responses
of
a
sandwich
beam
with
partially
covered
by
shear
thickening
fluid
(STF)
layer
under
an
impact
load
are
investigated.
nonlinear
governing
equations
the
flexural
derived
based
on
extended
Hamilton’s
principle
and
solved
finite
difference
method.
model
is
then
validated
used
to
develop
complete
parametric
study
beams
STF-filled
core
properly
design
place
STF
patch.
It
found
that,
for
first
mode,
maximum
damping,
smallest
change
in
natural
frequency
achieved
when
coverage
length
partial
patch
exceeds
50%
center
positioned
at
56.25%
from
left
edge.
For
second
37.5%
located
75%
edge
beam.
Additionally,
it
has
been
observed
that
maintaining
thickness
ratio
0.75
between
constraining
base
leads
increased
while
simultaneously
minimizing
alterations
original
results
can
be
structural
STF.
International Journal of Engineering Science,
Journal Year:
2024,
Volume and Issue:
203, P. 104123 - 104123
Published: July 27, 2024
Although
auxetic
metamaterials
exhibit
unique
and
unusual
mechanical
properties,
such
as
a
negative
Poisson's
ratio,
their
mechanics
remains
poorly
understood.
In
this
study,
we
model
graded
beam
fabricated
from
graphene
origami-enabled
investigate
its
dynamics
the
perspective
of
different
shear
deformation
theories.
The
metamaterial
is
composed
multiple
layers
metamaterials,
where
content
origami
varies
through
layered
thickness;
both
property
other
properties
are
varied
in
manner,
which
effectively
be
approximated
via
micromechanical
models.
Euler-Bernoulli,
third-order,
higher-order
deformable
refined
theories
adopted
to
continuous
system.
Following
this,
governing
motion
equations
derived
using
Hamiltonian
principle
then
numerically
solved
weighted
residual
method.
obtained
results
provide
comprehensive
understanding
how
distribution
pattern,
folding
degree,
utilisation
influence
dynamic
behaviour
beam.
Composite Structures,
Journal Year:
2024,
Volume and Issue:
334, P. 117969 - 117969
Published: Feb. 15, 2024
In
the
current
investigation,
for
first
time,
changes
in
limit
loads
and
equilibrium
branches
associated
with
nonlinear
in-plane
stability
characteristics
of
curved
microbeams
are
explored
presence
different
microstructural
gradient
tensors.
this
regard,
multiple
microsize-dependent
equilibria
analyzed
relevant
to
thermomechanical
loaded
small-curved,
medium-curved,
large-curved
made
functionally
graded
porous
(FGP)
metal
reinforced
nanofillers
possessing
clamped
end
supports.
To
purpose,
based
upon
strain
elasticity
within
framework
third-order
shear
flexible
beam
model,
isogeometric
collocation
formulations
incorporating
Greville
abscissae
constructed
resulting
higher-continuity
characters
as
well
remarkable
accuracy
higher-order
approximations.
It
is
deduced
that
small-curved
FGP
microbeam,
no
load
can
be
found
due
absence
buckling
phenomenon,
but
after
rising
temperature
by
an
enough
amount,
initial
instability
mode
appears.
However,
medium-curved
occurs
which
results
normalized
upper
equal
0.7161
on
classical
theory
0.7606
(6.21%
enhancement).
Also,
it
lower
0.3060
0.3521
(15.07%
On
other
hand,
bifurcation
1.0494
1.1358
(8.23%
0.2225
0.2513
(12.94%
