IOP Conference Series Materials Science and Engineering,
Journal Year:
2024,
Volume and Issue:
1319(1), P. 012027 - 012027
Published: Oct. 1, 2024
Abstract
Additive
manufacturing
is
in
continuous
development,
and
the
obtained
components
still
have
some
shortcomings.
The
vast
majority
of
mechanical
characterizations
are
performed
on
polymer
materials,
using
particular
material
extrusion
process,
while
metallic
face
not
negligible
deficiencies.
This
paper
presents
an
experimental
investigation
vibration
behaviour
selective
laser
melting
(SLM)
3D
printed
specimens.
specimens
were
“on-edge”
from
AlSi10Mg
aluminium
alloys
subjected
to
fatigue
tests.
By
electrodynamic
shaker,
controller,
acceleration
transducer,
vibrometer,
tests
been
data
analysed.
After
tests,
a
correlation
was
by
finite
element
analysis
(FEA).
damping
coefficients
(alpha
beta)
data.
These
then
used
check
accuracy
each
FEA
model.
results
reveal
between
structural
anisotropy
additive
specimens,
their
impact
high-cycle
performance.
Theoretical and Applied Fracture Mechanics,
Journal Year:
2024,
Volume and Issue:
132, P. 104478 - 104478
Published: May 22, 2024
Due
to
the
continuous
development
of
material
extrusion-additive
manufacturing
(MEX-AM)
technology,
fracture
behavior
polymeric
parts,
and
especially
their
associated
composites,
presents
some
shortcomings
but
also
a
challenge
in
field.
In
this
paper,
properties
non-reinforced
(NR)
reinforced
Polylactic
Acid
(PLA)
samples
manufactured
by
MEX-AM
process
are
investigated
through
tensile,
flexural
mechanics
tests.
The
with
glass
fibers
(GF-PLA),
carbon
(CF-PLA)
bronze
particles
(BP-PLA),
tested
parallel
(named
FLAT
for
all
tests)
normal
UPRIGHT
tensile
test,
ON-EDGE
layer
growth
(LG).
It
was
found
that
regardless
type
LG
significantly
influence
mechanical
collapse
modes
MEX-printed
samples.
obtained
parallel-LG
load
is
favorable
tests,
normal-LG
Overall,
NR-PLA
gives
best
strength,
strain
energy
absorption
properties,
CF-PLA
stands
out
as
stiffest
material,
while
BP-PLA
minimum
performances
almost
properties.
macroscopic
analyzes
fractured
clearly
highlight
distinct
failure
mechanisms
each
LG.
From
analysis
macrostructural
images,
identified
most
brittle
ductile.
Journal of Materials Research and Technology,
Journal Year:
2024,
Volume and Issue:
30, P. 1470 - 1481
Published: March 25, 2024
The
advent
of
Additive
Manufacturing
(AM)
for
producing
components
or
parts
made
thermoplastic
polymers
have
increased
the
necessity
a
deep
knowledge
their
mechanical
properties.
In
particular,
performance
under
impact
loads
is
still
not
fully
investigated
and
requires
thorough
knowledge.
this
paper,
polylactic
acid
(PLA)
samples
were
produced
by
material
extrusion
(MEX)
technology
subjected
to
low
velocity
(LVI)
tests
using
different
impactors'
geometries
energies.
Initially,
PLA
filament
MEX-printed
physico-chemical
evaluation
through
TG,
DSC
FTIR
analyses.
analyzes
highlighted
phase
transitions
specific
semicrystalline
polymer,
while
TG
analysis
showed
that
used
printing
temperature
(220
°C)
does
affect
thermal
behavior
filament.
assessment
consisted
single
repeated
LVI
on
same
sample
until
total
penetration
failure
reached.
analyzed
digital
radiography
detect
internal
damage
mechanisms.
impactor
shape
has
strong
effect
strength
tested
samples.
For
impacts,
peak
load
was
higher
20
mm
diameter
hemispherical
(H20),
lowest
value
experienced
with
10
(H10).
absorbed
energy
recorded
truncated
conical
(TC)
impactor.
multiple
H10
TC
impactors
it
possible
4
times,
respectively
2
times
H20
Engineering Failure Analysis,
Journal Year:
2024,
Volume and Issue:
161, P. 108335 - 108335
Published: April 17, 2024
Due
to
cyclic
loads,
additively
manufactured
(AM)
parts
can
collapse
at
lower
stress
values
than
the
strength
corresponding
static
loads.
To
date,
there
is
limited
research
on
fatigue
life
of
AM
polymers.
The
present
work
investigates
behavior
material
extrusion
(MEX)
printed
Polylactic
acid
(PLA)
parts.
In
this
regard,
low-cycle
(LCF)
domain
was
studied
and
a
compression-compression
test
setup
adopted.
Initially,
before
experimental
tests,
MEX-printed
samples
were
subjected
physical
assessments.
presented
high
accuracy
with
dimensional
relative
errors
below
0.04
%,
while
6.66
%
noted
as
their
mass
error.
Subsequently,
quasi-static
tests
performed
in
order
determine
mechanical
parts,
special
focus
S-N
(or
Wöhler)
curve.
compression
PLA
typical
cellular
materials,
highlighting
shear
band
failure
mechanism.
Five
load
levels
used
plot
curve
its
95
level
confidence
bands.
force-controlled
mode
asymmetry
ratio
R
=
0.1
frequency
f
10
Hz.
An
exponential
relationship
also
found
between
strain
break
number
cycles
until
failure.
occurred
suddenly.
Fatigue & Fracture of Engineering Materials & Structures,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 24, 2024
Abstract
PolyEther
Ether
Ketone
(PEEK)
is
a
leading
thermoplastic
biomaterial
renowned
for
its
exceptional
overall
properties
and
suitability
processing
via
Fused
Filament
Fabrication
(FFF)
Additive
Manufacturing
(AM).
Despite
widespread
use
in
industries,
fatigue
behavior
remains
critically
underexplored
aspect.
This
study
aims
to
investigate
the
of
FFF‐produced
PEEK,
considering
variations
infill
pattern
(triangular
or
rectilinear)
layer
height
(0.15
mm
0.25
mm).
Fatigue
tests
revealed
significant
influence
on
behavior,
with
rectilinear
outperforming
triangular
one.
Layer
had
negligible
effect
when
paired
infill.
Specimens
patterns
exhibited
superior
performance,
achieving
infinite
life
at
maximum
applied
stress
around
70%
ultimate
tensile
stress.
Surface
roughness
assessment
fracture
surface
analysis
scanning
electron
microscope
enhanced
interpretation
results.
pioneering
lays
groundwork
future
research
design
AM.
Physica Scripta,
Journal Year:
2024,
Volume and Issue:
99(12), P. 125955 - 125955
Published: Nov. 6, 2024
Abstract
This
study
explores
the
effect
of
key
process
parameters
on
tensile
strength
carbon-coated
PLA
(Polylactic
Acid)
material
using
additive
manufacturing.
The
problem
addressed
is
need
to
enhance
mechanical
properties
PLA,
a
widely
used
biodegradable
polymer,
by
optimizing
improve
its
when
coated
with
carbon.
investigated
include
infill
pattern,
printing
speed,
layer
thickness,
and
orientation.
A
response
surface
methodology
(RSM)
was
employed
design
experiments,
while
Minitab
15
software
analyze
data
through
analysis
variance
(ANOVA).
results
indicate
that
optimal
parameters,
linear
speed
20
mm
s
−1
,
thickness
150
μm,
Y-90
orientation,
yield
an
average
56.4
MPa.
regression
model
developed
predict
strength,
high
degree
accuracy
(R
2
=
0.97).
Confirmation
tests
verified
model’s
predictions,
contributing
development
high-performance
PLA-based
materials
for
demanding
applications.
