Materials & Design,
Journal Year:
2021,
Volume and Issue:
209, P. 109990 - 109990
Published: July 17, 2021
Metamaterials
have
been
extensively
investigated
owing
to
their
unusual
properties.
However,
the
design
of
multifunctional
metamaterials
requires
further
investigation.
This
study
focused
on
three-dimensional
(3D)
achieve
tunable
negative
thermal
expansion
and
phononic
bandgap
First,
independent
continuous
mapping
(ICM)
topology
optimisation
method
was
applied
create
metamaterial
microstructures
with
properties
based
multi-scale
asymptotic
homogenisation
theory.
Secondly,
conceptual
structure
from
reconstructed
parameterized
desired
widths
under
expansion,
using
a
surrogate
model-based
method.
Both
coefficient
bandgaps
were
verified
through
numerical
simulations.
The
results
reveal
that,
by
selecting
appropriate
parameters,
designed
can
both
maximum
width
ratio.
proposed
provides
an
important
reference
for
rational
metamaterials.
Mechanics of Advanced Materials and Structures,
Journal Year:
2024,
Volume and Issue:
31(30), P. 12885 - 12897
Published: March 18, 2024
Sandwich
plates
are
extensively
utilized
across
various
fields,
encompassing
building
engineering,
mechanical
and
aerospace
owing
to
their
exceptional
stiffness-to-weight
ratio.
However,
effectively
attenuating
the
low-frequency
broadband
vibrations
of
these
poses
a
significant
challenge.
This
paper
proposes
new
type
metamaterial
sandwich
plate
that
incorporates
two-degree
freedom
inertial
amplified
resonators
(IA-MSPDF2),
attain
two
band
gaps
(BGs)
achieve
vibration
attenuation.
The
dispersion
relation
IA-MSPDF2
is
calculated
based
on
Bloch-Floquet
theorem,
generation
mechanism
BGs
analyzed
through
eigenmodes.
Both
numerical
experimental
studies
conducted
substantiate
advantages
associated
with
presence
in
design.
results
show
enhanced
coupling
effect
between
primary
secondary
leads
local
resonance
shifts
lower
frequencies,
resulting
Bragg
scattering
BG
arises
above
locally
resonant
BG.
Compared
one-degree
(IA-MSPDF1)
equal
mass,
exhibits
an
increased
relative
bandwidth
by
15%.
Increasing
damping
resonator
causes
attenuation
zones
widen
merge
into
wider
zone.
proposed
can
robustly
attenuate
small
mass
cost,
contributing
further
exploration
utilization
engineering
applications.
