Mathematics and Mechanics of Solids,
Год журнала:
2024,
Номер
29(5), С. 881 - 903
Опубликована: Янв. 23, 2024
We
propose
a
topology
optimisation
approach
that
can
effectively
account
for
the
size
effect
of
periodic
composite
plates
to
determine
optimal
material
distribution
achieving
largest
bandgap
width.
The
is
based
on
modified
couple
stress
continuum
and
uses
relative
width
as
objective
function,
with
volume
constraints
defined
constraint
function.
properties
are
represented
by
solid
isotropic
penalisation
(SIMP)
interpolation
model,
optimality
criteria
(OC)
algorithm
employed
update
design
variables.
To
address
significant
microplate
structure,
we
use
model
dynamic
behaviour
unit
cell.
Melosh–Zienkiewicz–Cheung
(MZC)
finite
element
ensure
nodal
[Formula:
see
text]
continuity
achieve
high-order
elasticity
respect
inter-element
continuity.
Our
results
demonstrate
proposed
methodology
capable
designing
cell
configurations
significantly
improve
also
investigate
impact
thickness
limitations
optimised
configuration.
obtained
suggest
framework
promising
geometries
effect.
Mechanics Research Communications,
Год журнала:
2023,
Номер
128, С. 104045 - 104045
Опубликована: Янв. 9, 2023
In
this
work,
the
wave
propagation
properties
of
lightened
bioinspired
composite
materials
are
investigated.
A
new
nacre-like
microstructure
is
proposed
demonstrating
that
incorporation
hollow
platelets
inside
soft
matrix
and
application
specific
prestress
states
represent
a
viable
way
for
tuning
complete
band
gaps
range
without
varying
geometry
length
scale
also
improving
mechanical
in
terms
homogenized
tangent
moduli.
The
dispersion
relations
obtained
by
adopting
Bloch-Floquet
theory
to
investigate
appearance
several
geometrical
material
parameters
(platelets
aspect
ratio,
joints
thickness,
void
volume
fraction,
shear
modulus
contrast).
results
reveal
combinations
which
excellent
absorption
capabilities
periodic
thanks
may
provide
opportunities
microstructural
design
3D
printed
metamaterials.
Defence Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 1, 2024
Inspired
by
nature's
self-similar
designs,
novel
honeycomb-spiderweb
based
hybrid
cellular
structures
are
proposed
here
for
efficient
energy
absorption
in
impact
applications.
The
is
enhanced
optimizing
the
geometry
and
topology
a
given
mass.
structure
arrived
after
thorough
analysis
of
topologically
structures.
optimized
cell
designs
rigorously
tested
considering
dynamic
loads
involving
crush
high-velocity
bullet
impact.
Furthermore,
influence
thickness,
radial
connectivity,
order
patterning
at
unit
level
also
investigated.
maximum
crushing
efficiency
attained
found
to
be
more
than
95%,
which
significantly
higher
most
existing
traditional
designs.
Later
on,
first
second-order
hierarchical
developed
during
used
prepare
cores
sandwich
Impact
tests
performed
on
using
standard
9-mm
parabellum.
multistaging
resistance
investigated
maintaining
constant
total
thickness
mass
structure.
Moreover,
avoid
layer-wise
weak
zones
hence,
attain
uniform
out-of-plane
strength,
off-setting
each
stage
proposed.
with
observed
withstand
velocities
as
high
170
m/s
270
m/s,
respectively.
Materials,
Год журнала:
2024,
Номер
17(3), С. 705 - 705
Опубликована: Фев. 1, 2024
Recent
studies
have
shown
that
the
mechanical
properties
of
bioinspired
periodic
composite
materials
can
be
strongly
influenced
by
finite
deformation
effects,
leading
to
highly
nonlinear
static
and
dynamic
behaviors
at
multiple
length
scales.
For
instance,
in
porous
nacre-like
microstructures,
microscopic
macroscopic
instabilities
may
occur
for
a
given
uniaxial
loading
process
and,
as
consequence,
wave
attenuation
evolve
function
microstructural
evolution,
designating
it
metamaterials.
The
numerical
outcomes
provide
new
opportunities
design
bioinspired,
soft
metamaterials
characterized
high
deformability
enhanced
elastic
capabilities
insertion
voids
lead
cores.
