Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Дек. 28, 2024
This
study
explores
the
impact
of
metallic
shells
by
electroforming
method
on
mechanical
behavior
thermoplastic
polyurethane
(TPU)-based
lattice
structures.
First,
TPU
structures
were
printed
additive
manufacturing
technique.
Then
layers
Ni
and
Cu
as
a
thin
shell
dressed
in
baths
solutions.
Finally,
uniaxial
compression
tests
achieved
samples.
Results
demonstrated
substantial
enhancements
performance
attributable
to
these
coatings.
Notably,
Ni-coated
structure
(Ni-LS)
exhibited
peak
yield
strength
4.55
MPa,
marking
1.08-fold
improvement
over
Ni-Cu-LS
1.35-fold
increase
relative
Ni-Cu-Ni-LS
variant.
Furthermore,
energy
absorption
density
coated
was
elevated
nearly
sixfold
compared
uncoated
lattice,
with
multi-layer
coatings
providing
additional
gains.
These
results
underscore
potential
Cu-coated
lattices
deliver
exceptional
strength-to-weight
ratios
enhanced
capabilities.
Sensors,
Год журнала:
2025,
Номер
25(5), С. 1463 - 1463
Опубликована: Фев. 27, 2025
This
paper
proposes
a
switchable
and
tunable
terahertz
metamaterial
absorber
utilizing
graphene-VO2
layered
structure.
The
design
employs
reconfigurable
seven-layer
architecture
from
top
to
bottom
as
(topaz/VO2/topaz/Si/graphene/topaz/Au).
CST
software
2018
was
used
simulate
the
absorption
properties
of
waves
(0–14
THz).
proposed
exhibits
dual
functionalities
depending
on
VO2
phase
state.
In
insulating
state,
achieves
tri-band
response
with
distinct
peaks
at
3.12
THz,
5.65
7.24
THz.
Conversely,
VO2’s
conducting
state
enables
ultra-broadband
2.52
THz
11.62
Extensive
simulations
were
conducted
demonstrate
tunability
absorption:
Simulated
spectra
obtained
for
broadband
multi-band
states.
Electric
field
distributions
analyzed
resonance
frequencies
both
impact
studied
conductivity,
loss
tangent,
graphene’s
chemical
potential
absorption.
influence
investigated
topaz
layer
thickness
spectrum.
Absorption
behavior
examined
under
different
states
configurations.
Variations
frequency,
polarization
angle,
incident
angle.
detection
cervical
breast
cancer
sensitivity
is
about
0.2489
THz/RIU.
holds
significant
promise
real-world
applications
due
its
reconfigurability.
allows
tailoring
across
broad
range,
making
it
suitable
advanced
devices
like
filters,
modulators,
perfect
absorbers.
Journal of the Mechanics and Physics of Solids,
Год журнала:
2024,
Номер
187, С. 105626 - 105626
Опубликована: Март 23, 2024
We
propose
a
design
strategy
for
creating
origami-like
mechanical
metamaterials
with
diverse
non-linear
properties
and
capable
of
remote
actuation.
The
proposed
triangulated
cylindrical
origami
(TCO)-inspired
enable
the
highly
desirable
strain-softening/hardening
snap-through
behaviors
via
multi-material
deformable
hinge
design.
Moreover,
we
couple
these
novel
TCO
origami-inspired
transformative
ability
hard-magnetic
active
materials,
allowing
untethered
shape-
property-actuation
in
developed
metamaterials.
develop
mathematical
modeling
framework
metamaterials,
building
on
approximating
hinges
as
combination
longitudinal
rotational
springs.
validate
accuracy
approach
by
comparing
analytically
predicted
compressive
response
unit
cell
structure
corresponding
numerical
experimental
results.
Using
framework,
investigate
magnetic
field-induced
large
deformation
superimposed
solitary
wave
propagation
metamaterial
system.
show
that
allows
us
to
tune
key
characteristics
enabled
waves,
including
their
characteristic
width
amplitude.
readily
manufacturable
systems
paves
path
practical
engineering
applications.
Our
studies
also
underscore
potential
magneto-mechanical
interaction
reconfigurable
superior
elastic
properties.
Journal of Applied Mechanics,
Год журнала:
2024,
Номер
91(10)
Опубликована: Июль 9, 2024
Abstract
Hard-magnetic
soft
materials,
which
exhibit
finite
deformation
under
magnetic
loading,
have
emerged
as
a
promising
class
of
active
materials
for
the
development
phononic
structures
with
tunable
elastic
wave
band
gap
characteristics.
In
this
paper,
we
present
gradient-based
topology
optimization
framework
designing
hard-magnetic
materials-based
two-phase
wide
and
magnetically
anti-plane
shear
gaps.
The
incompressible
Gent
hyperelastic
material
model,
along
ideal
is
used
to
characterize
constitutive
behavior
structure
phases.
To
extract
dispersion
curves,
an
in-house
element
model
in
conjunction
Bloch’s
theorem
employed.
method
moving
asymptotes
iteratively
update
design
variables
obtain
optimal
distribution
phases
within
unit
cell.
Analytical
sensitivity
analysis
performed
evaluate
gradient
maximization
function
respect
each
one
variables.
Numerical
results
show
that
optimized
width
comparison
standard
central
circular
inclusion,
demonstrating
effectiveness
proposed
numerical
framework.
presented
study,
derived
conclusions,
can
serve
valuable
guide
futuristic
manipulators.
Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences,
Год журнала:
2024,
Номер
382(2278)
Опубликована: Июль 29, 2024
Owing
to
the
architected
void-filled
low-density
configurations,
metamaterials
are
prone
defects
during
complex
manufacturing
process,
or
damages
under
operational
conditions.
Recently
mechanical
cloaking
has
been
proposed
shield
effect
of
such
disorders
in
terms
homogenized
responses.
The
major
drawback
these
studies
that
damage
location
should
be
known
a
priori
,
and
cloak
is
designed
around
damaged
zone
before
manufacturing.
Such
postulation
does
not
allow
unsupervised
resilience
service
life
by
active
reconfiguration
stress
field
depending
on
random
unpredictable
evolution
damage.
Here,
we
propose
radically
different
approach
introducing
piezoelectric
lattices
where
appearance
any
single
multiple
with
shapes,
sizes
distributions
can
shielded
through
multi-physically
controlled
cloaks
voltage-dependent
modulation
fields
within
region.
Notably,
this
achieved
without
breaking
periodicity
additional
material
region
unlike
earlier
concerning
cloaks.
class
elastic
will
bring
step-change
on-demand
performance
critically
important
structural
components
for
enhanced
durability
sustainability.
This
article
part
theme
issue
‘Current
developments
acoustic
science
(Part
1)’.
Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences,
Год журнала:
2025,
Номер
481(2305)
Опубликована: Янв. 1, 2025
Wave
invisibility
has
received
increasing
attention
due
to
its
great
theoretical
value
and
application
aerospace,
military
other
fields.
In
this
work,
the
invisible
flexural
cloak
for
double
hole
targets
in
an
elastic
thick
plate
is
proposed
proportional
integral
derivative
(PID)
active
control
applied.
Based
on
Mindlin
theory
wave
function
expansion
method,
equation
derived
scattering
mode
coefficients
are
obtained.
The
influences
of
structural
material
parameters
dynamic
stress
concentration,
amplitude
cross
section
(SCS)
investigated.
With
consideration
specific
targets,
cloaking
configuration
includes
cloaks
1
2
consists
periodically
arranged
piezoelectric
(PZT)
patches.
Every
PZT
patch
attached
circuit
with
PID
function.
experimental
results
illustrate
that
can
achieve
within
multiple
frequency
regions.
On
hand,
reduce
SCS
plate.
Different
from
original
structure
without
control,
effective
range
be
widely
extended.
Advanced Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 17, 2025
Abstract
Wires
designed
to
carry
loads
through
uniaxial
tensile
forces
are
particularly
useful
in
creating
large‐span,
yet
lightweight,
structures
of
diverse
shapes
and
functions.
Incorporating
self‐oscillation
capabilities
within
the
wires
could
be
a
promising
approach
enhance
autonomous
dynamic
functions
these
structures.
However,
self‐oscillation,
which
usually
appears
biological
organisms
active
materials,
requires
complex
feedback
interactions
between
activity
elasticity,
hindering
their
application
self‐oscillating
wires.
Here,
simple
strategy
is
suggested
by
extending
Willis
elasticity
Willis‐type
viscosity
an
irreversible
coupling
strain
rate
body
force.
A
class
equipped
with
electro‐magneto‐mechanically
coupled
feedforward
loops
realize
coupling.
Numerical
experiments
show
that
wire
hosts
biased
limit‐cycle
where
oscillation
amplitudes
amplified
linearly
along
one
direction.
Using
continuum
models,
linear
amplification
interpreted
as
force
equilibrium
caused
asymmetric
viscosity.
In
design,
mode
shape
can
tailored
independently
frequency,
supports
standing
propagating
transition.
The
design
model
benefit
development
materials
for
large‐span
