Advanced Materials,
Год журнала:
2023,
Номер
35(42)
Опубликована: Июль 12, 2023
Auxetic
materials
are
appealing
due
to
their
unique
characteristics
of
transverse
expansion
while
being
axially
stretched.
Nevertheless,
current
auxetic
often
produced
by
the
introduction
diverse
geometric
structures
through
cutting
or
other
pore-making
processes,
which
heavily
weaken
mechanical
performance.
Inspired
skeleton-matrix
in
natural
organisms,
this
study
reports
an
integrated
elastomer
(IAE)
composed
high-modulus
cross-linked
poly(urethane-urea)
as
a
skeleton
and
low-modulus
non-cross-linked
complementary-shape
matrix.
Benefiting
from
disulfide
bonds
hydrogen-bond-promoted
dual
dynamic
interfacial
healing,
resulting
IAE
is
flat,
void-free,
has
no
sharp
soft-to-hard
interface.
Its
fracture
strength
elongation
at
break
increased
400%
150%,
respectively,
values
corrugated
re-entrant
alone,
negative
Poisson's
ratio
(NPR)
reserves
within
strain
range
0%-104%.
In
addition,
advantageous
properties
further
confirmed
finite
element
analysis.
The
concept
combining
two
dissimilar
polymers
into
hybrid
material
solves
problem
deterioration
performance
after
subtractive
manufacturing,
preserves
NPR
effect
large
deformation,
provides
promising
approach
robust
for
engineering
applications.
Chemical Society Reviews,
Год журнала:
2024,
Номер
53(11), С. 5956 - 6010
Опубликована: Янв. 1, 2024
Soft
actuators,
pivotal
for
converting
external
energy
into
mechanical
motion,
have
become
increasingly
vital
in
a
wide
range
of
applications,
from
the
subtle
engineering
soft
robotics
to
demanding
environments
aerospace
exploration.
Among
these,
electrochemically-driven
actuators
(EC
actuators),
are
particularly
distinguished
by
their
operation
through
ion
diffusion
or
intercalation-induced
volume
changes.
These
feature
notable
advantages,
including
precise
deformation
control
under
electrical
stimuli,
freedom
Carnot
efficiency
limitations,
and
ability
maintain
actuated
state
with
minimal
use,
akin
latching
skeletal
muscles.
This
review
extensively
examines
EC
emphasizing
classification
based
on
diverse
material
types,
driving
mechanisms,
actuator
configurations,
potential
applications.
It
aims
illuminate
complicated
mechanisms
different
categories,
uncover
underlying
connections,
reveal
interdependencies
among
materials,
performances.
We
conduct
an
in-depth
analysis
both
conventional
emerging
casting
forward-looking
lens
trajectories
pinpointing
areas
ready
innovation
performance
enhancement
strategies.
also
navigate
challenges
opportunities
within
field,
optimizing
current
exploring
new
scaling
up
production
processes.
Overall,
this
provide
scientifically
robust
narrative
that
captures
sets
trajectory
future
rapidly
advancing
field.
Theoretical and Applied Mechanics Letters,
Год журнала:
2024,
Номер
14(2), С. 100508 - 100508
Опубликована: Март 1, 2024
In
this
paper,
a
liquid-solid
origami
composite
design
is
proposed
for
the
improvement
of
impact
resistance.
Employing
strategy,
Kresling
structures
with
different
fillings
were
designed
and
fabricated,
namely
air,
water,
shear
thickening
fluid
(STF).
Quasi-static
compression
drop-weight
experiments
carried
out
to
compare
reveal
static
dynamic
mechanical
behavior
these
structures.
The
results
from
demonstrated
that
solid-liquid
exhibited
superior
yield
strength
reduced
peak
force
when
compared
their
empty
counterparts.
Notably,
filled
STF
significantly
heightened
force.
For
example,
at
an
velocity
3
m/s,
single-layer
STF-filled
increased
by
772.7%
decreased
68.6%.
This
holds
potential
advance
application
in
critical
areas
such
as
aerospace,
intelligent
protection
other
important
fields.
improvements
resistance
underscore
practical
viability
approach
enhancing
structural
performance
range
applications.
Advanced Materials,
Год журнала:
2023,
Номер
35(42)
Опубликована: Июль 12, 2023
Auxetic
materials
are
appealing
due
to
their
unique
characteristics
of
transverse
expansion
while
being
axially
stretched.
Nevertheless,
current
auxetic
often
produced
by
the
introduction
diverse
geometric
structures
through
cutting
or
other
pore-making
processes,
which
heavily
weaken
mechanical
performance.
Inspired
skeleton-matrix
in
natural
organisms,
this
study
reports
an
integrated
elastomer
(IAE)
composed
high-modulus
cross-linked
poly(urethane-urea)
as
a
skeleton
and
low-modulus
non-cross-linked
complementary-shape
matrix.
Benefiting
from
disulfide
bonds
hydrogen-bond-promoted
dual
dynamic
interfacial
healing,
resulting
IAE
is
flat,
void-free,
has
no
sharp
soft-to-hard
interface.
Its
fracture
strength
elongation
at
break
increased
400%
150%,
respectively,
values
corrugated
re-entrant
alone,
negative
Poisson's
ratio
(NPR)
reserves
within
strain
range
0%-104%.
In
addition,
advantageous
properties
further
confirmed
finite
element
analysis.
The
concept
combining
two
dissimilar
polymers
into
hybrid
material
solves
problem
deterioration
performance
after
subtractive
manufacturing,
preserves
NPR
effect
large
deformation,
provides
promising
approach
robust
for
engineering
applications.
