Materials,
Год журнала:
2024,
Номер
17(17), С. 4407 - 4407
Опубликована: Сен. 6, 2024
This
article
addresses
manufacturing
structures
made
via
injection
molding
from
biodegradable
materials.
The
mentioned
can
be
successfully
used
as
energy-absorbing
liners
of
all
kinds
sports
helmets,
replacing
the
previously
expanded
polystyrene.
paper
is
focused
on
technological
tests
and
tensile
(in
quasi-static
dynamic
conditions)
several
composites
based
a
PLA
matrix
with
addition
other
softening
agents,
such
PBAT
TPS
(the
blends
were
prepared
melt
blending
using
screw
extruder
mass
compositions
50:50,
30:70,
15:85).
Tensile
showed
positive
strain
rate
sensitivity
mixtures
dependence
increase
in
ratio
to
static
yield
stress
share
plastic
component
mixture.
Technological
that
increasing
amount
plasticizing
additive
by
35%
(from
50%
85%)
results
decrease
minimal
thickness
thin-walled
element
molded
about
32%
case
PLA/PBAT
0.22
mm
0.15
mm)
26%
PLA/TPS
0.23
0.17
mm).
Next,
elements
(dimensions
55
×
20
manufactured
evaluated
spring-loaded
drop
hammer.
60
J
impact
energy
was
tested
accordance
EN
1078
standard.
crushing
test
included
checking
influence
materials'
temperature
(-20,
0,
20,
40
°C)
velocity.
It
proven
maximum
deflection
increases
material
an
PLA15PBAT85
blend
selected
most
effective
terms
its
use
liner
for
sport
helmets.
Johnson-Cook
Cowper-Symonds
models
constructed.
Their
during
FE
simulation
provided
good
agreement
those
conducted
experiment.
Materials Testing,
Год журнала:
2024,
Номер
66(10), С. 1728 - 1738
Опубликована: Авг. 26, 2024
Abstract
3D-printed
truss
structures
have
remarkable
potential
in
the
aerospace
and
weight-critical
technologies
fields.
However,
design
parameters
need
to
be
carefully
considered.
A
low
overhang
angle
or
diameter
can
result
discrepancies.
This
research
presents
an
approach
by
examining
effect
of
strut
radius
on
mechanical
properties
3-,
4-
6-strut
lattice
under
compressive
loading.
1.6-
2.4-mm
struts
were
designed
with
45°,
50°,
55°
60°
lattices.
Experiments
simulated
compared
test
results
for
each
parameter.
Even
if
joint
regions
little
specimens’
density,
it
has
a
specimen.
To
simulate
this,
many
studies
investigated
regions.
The
study’s
goal
is
deepen
understanding
how
variations
influence
their
energy-absorbing
characteristic
behavior,
using
combination
static
tests
finite
element
analysis
validation.
insight
crucial
optimizing
balance
weight,
strength,
capacity
effectively.
experimental
numerical
showed
rather
good
agreement.
It
observed
that
regions,
angle,
diameters
main
affecting
behavior.
Materials,
Год журнала:
2024,
Номер
17(17), С. 4407 - 4407
Опубликована: Сен. 6, 2024
This
article
addresses
manufacturing
structures
made
via
injection
molding
from
biodegradable
materials.
The
mentioned
can
be
successfully
used
as
energy-absorbing
liners
of
all
kinds
sports
helmets,
replacing
the
previously
expanded
polystyrene.
paper
is
focused
on
technological
tests
and
tensile
(in
quasi-static
dynamic
conditions)
several
composites
based
a
PLA
matrix
with
addition
other
softening
agents,
such
PBAT
TPS
(the
blends
were
prepared
melt
blending
using
screw
extruder
mass
compositions
50:50,
30:70,
15:85).
Tensile
showed
positive
strain
rate
sensitivity
mixtures
dependence
increase
in
ratio
to
static
yield
stress
share
plastic
component
mixture.
Technological
that
increasing
amount
plasticizing
additive
by
35%
(from
50%
85%)
results
decrease
minimal
thickness
thin-walled
element
molded
about
32%
case
PLA/PBAT
0.22
mm
0.15
mm)
26%
PLA/TPS
0.23
0.17
mm).
Next,
elements
(dimensions
55
×
20
manufactured
evaluated
spring-loaded
drop
hammer.
60
J
impact
energy
was
tested
accordance
EN
1078
standard.
crushing
test
included
checking
influence
materials'
temperature
(-20,
0,
20,
40
°C)
velocity.
It
proven
maximum
deflection
increases
material
an
PLA15PBAT85
blend
selected
most
effective
terms
its
use
liner
for
sport
helmets.
Johnson-Cook
Cowper-Symonds
models
constructed.
Their
during
FE
simulation
provided
good
agreement
those
conducted
experiment.
