International Journal of Mechanical Sciences,
Год журнала:
2024,
Номер
275, С. 109364 - 109364
Опубликована: Май 6, 2024
A
novel
highly
compressible
auxetic
cementitious
composite
(ACC)
is
developed
in
this
work.
Contrary
to
conventional
materials,
such
as
plain
concrete
and
fiber
reinforced
concrete,
the
ACC
shows
strain-hardening
behavior
under
uniaxial
compression:
stress
continuously
increases
with
strain
up
approximately
40%
strain.
On
one
hand,
early
compression
stage,
exhibit
recoverable
deformability
of
10%
cyclic
loading
(20
times
higher
than
constituent
material).
In
addition,
fatigue
damage
until
stiffness/strength
energy
dissipation
plateau
values
are
reached
after
500
cycles.
At
2.5%
amplitude,
120
MPa/3
MPa,
while
these
only
25
MPa/1.2
MPa
at
5%
amplitude.
contrast,
independent
from
amplitude
remains
0.05J/cm3.
other
due
behavior,
exhibits
significantly
improved
capacity
compared
both
materials
frame.
This
achieved
by
a
tailored
action:
integrating
mortar
3D
printed
thermoplastic
polyurethane
(TPU)
rotating-square
mechanism
was
designed
for
TPU
frame
achieve
cracking
behavior.
The
horizontal
cells
enable
large
enlarging
crack
width
confinement
frame,
vertical
work
stiffening
phase
ensure
load
resistance.
Owing
outstanding
mechanical
properties,
great
potential
be
applied
engineering
practice
where
high
compressive
required,
instance
yielding
elements
squeezing
tunnel
linings.
Progress in Aerospace Sciences,
Год журнала:
2024,
Номер
149, С. 101021 - 101021
Опубликована: Июль 17, 2024
Lattice
structures,
produced
by
repeated
unit
cells
in
the
particular
pattern,
offer
a
high
strength-to-weight
ratio.
The
current
advancement
Additive
manufacturing
(AM)
technology,
creating
complex
geometries
like
lattice
structures
has
revolutionized
production
across
various
industries.
While
several
reviews
have
focused
on
different
specific
aspects
of
comprehensive
overview
recent
advancements
aerospace
structural
applications
is
lacking.
Therefore,
review
used
lightweight
manufactured
through
AM
presented
here.
Basic
classification
structure
followed
detailed
study
factors
influencing
mechanical
properties
crucial
for
application.
Current
trends
technologies
are
analyzed
detail
with
identification
capabilities
and
limitations.
Furthermore,
literature
optimization
techniques
engineering
lightweight,
along
fabrication
processes
involved,
challenges
future
research
directions
reported.
By
providing
insights
into
directions,
this
serves
as
valuable
resource
researchers
engineers
involved
design
development
structures.
It
lays
groundwork
exploration
new
innovative
tailored
to
meet
evolving
needs
industry.
International Journal of Mechanical Sciences,
Год журнала:
2024,
Номер
268, С. 109010 - 109010
Опубликована: Янв. 4, 2024
Collapse
mechanisms
of
sandwich
panels
with
Miura-ori
cores
are
analysed
and
classification
the
deformation
regimes
under
three-point
bending
is
proposed.
It
revealed
that
homogenisation
approach
to
core
material
properties
not
applicable
relatively
strong
origami
due
immediate
simultaneous
local
deformations
face
sheets.
To
describe
this
regime,
an
analytical
model
based
on
development
new
stationary
hinge
lines
in
cells
rigid
motion
rotation
adjacent
planes
The
pertains
a
single
degree-of-freedom
governed
by
global
angle
panel.
On
other
hand,
proved
be
analysis
soft
cores.
This
used
analytically
obtain
collapse
load
related
several
modes.
Parametric
FE
conducted
further
explore
different
sheet
thicknesses.
Experiments
were
validate
finite
element
studies
models.
A
good
agreement
between
predicted
forces
those
obtained
simulations
shown.
Deformation
mode
maps
constructed
analyses
terms
thicknesses
strength.
brief
comparison
strength
PVC
honeycomb
presented,
demonstrating
superiority
loaded
out-of-plane
direction.
possibility
high
shear
strains
metallic
without
damage
gives
them
advantages
compared
low
density
foam
