Materials,
Год журнала:
2024,
Номер
18(1), С. 29 - 29
Опубликована: Дек. 25, 2024
The
stress
distribution
within
the
struts
of
lattice
metamaterials
is
non-uniform
under
compressive
loads,
with
concentrations
typically
occurring
at
node
regions.
Inspired
by
bamboo,
this
study
proposes
a
type
body-centered
cubic
(BCC)
metamaterial
tapered
prism
(BCCT).
behavior,
deformation
modes,
mechanical
properties,
and
failure
mechanisms
BCCT
are
systematically
analyzed
using
finite
element
methods
validated
through
compression
tests.
Parametric
analysis
conducted
to
investigate
effects
key
design
parameters,
including
volume
fraction,
shape
parameter,
material
properties.
results
reveal
that
effectively
eliminate
concentration
nodes
redistributing
toward
center
struts.
This
redistribution
changes
mode
from
shear
band
layer
collapse,
while
maintain
bending-dominated
mechanism
compression.
properties
significantly
influenced
factor.
Furthermore,
different
fractions
materials
consistently
superior
BCC
ones,
which
verifies
effectiveness
adaptability
taper
prismatic
for
potential
lightweight
applications.
Fatigue & Fracture of Engineering Materials & Structures,
Год журнала:
2024,
Номер
47(8), С. 2823 - 2840
Опубликована: Май 13, 2024
Abstract
The
pyramid
lattice
sandwich
structure,
characterized
by
high
load‐bearing
capacity,
lightweight
nature,
and
fully
open
internal
space,
is
considered
an
extremely
promising
super‐strong
structure.
Stereolithography
technology
was
utilized
to
achieve
the
monolithic
formation
of
single‐layer
multi‐cell
pyramidal
structures.
Quasi‐static
compression
tests
finite
element
simulations
were
conducted
characterize
compressive
properties
failure
modes.
Results
indicate
that
strength,
modulus,
specific
stiffness
structure
increase
as
relative
density
increases.
Moreover,
fracture
observed
in
structures
with
various
densities.
Additionally,
multi‐layer
gradient
investigated.
Experimental
numerical
findings
optimal
scheme
for
ZCMLG
I‐III‐II,
resulting
a
peak
force
342.14%
288.55%
higher
than
ZAMLG
ZBMLG
structures,
respectively.
Mechanical
metamaterials
with
multi-level
dynamic
crushing
effects
(MM-MLs)
are
designed
in
this
study
through
coordinate
transformation
and
mirror
arrays.
The
mechanical
of
the
diameter
length
ratio
struts
connecting
rods,
Euler
angles,
cell
numbers
on
properties
investigated
separately.
MM-ML
can
exhibit
significant
two-level
platform
stress,
local
cells
first
stress
stage
undergo
rotational
motion,
while
second
mainly
involves
collapse
compression
bending.
Although
increasing
rods
increase
range
Poisson's
ratio,
it
will
reduce
level
energy
absorption.
Increasing
angle
strain
interval
improve
absorption
capacity.
In
addition,
number
maintaining
a
constant
relative
density
effectively
enhance
has
parameter
controllability,
achieve
different
regions,
ranges
ratios,
requirements
according
to
application
scenario,
demonstrate
functional
diversity
compared
existing
research.
design
scheme
provide
ideas
for
adaptive
protection
requirements.
