Procedia Structural Integrity,
Год журнала:
2023,
Номер
47, С. 469 - 477
Опубликована: Янв. 1, 2023
The
present
study
investigates
the
crack-induced
degradation
of
vibration
characteristics
in
FRP-strengthened
reinforced
concrete
elements.
Specifically,
an
innovative
numerical
method,
based
on
combination
inter-element
fracture
approach
and
embedded
truss
model,
has
been
implemented
into
a
2D
finite
element
framework
to
evaluate
progressive
variation
static
dynamic
properties
as
damage
level
increases.
obtained
results
have
compared
with
those
from
structural
analysis
performed
beam
without
FRP
system
(denoted
control
beam).
comparison
highlights
reliability
proposed
model
determining
both
response,
terms
load-deflection
curve,
natural
frequencies,
for
levels.
Moreover,
"Modal
Assurance
Criterion"
(MAC)
evaluated
indicator
compute
correlation
between
modal
shapes
damaged
configurations
undamaged
ones.
Buildings,
Год журнала:
2023,
Номер
13(5), С. 1139 - 1139
Опубликована: Апрель 24, 2023
The
ability
to
manipulate
concrete-based
and
composite
materials
at
the
nanoscale
represents
an
innovative
approach
improving
their
mechanical
properties
designing
high-performance
building
structures.
In
this
context,
a
numerical
investigation
of
reinforcing
effect
nano-modified
epoxy
resin
on
structural
response
fiber-reinforced
polymer
(FRP)-plated
reinforced
concrete
(RC)
components
has
been
proposed.
detail,
integrated
model,
based
cohesive
crack
approach,
is
employed
in
combination
with
bond–slip
model
perform
failure
analysis
strengthened
particular,
proposed
consists
elements
located
physical
interface
between
FRP
systems
equipped
appropriate
law
able
describe
induced
by
incorporation
nanomaterials
bonding
resin.
Preliminary
analyses,
performed
prisms,
highlight
increment
28%
bond
strength
system,
offered
embedded
adhesive
layer
respect
standard
one.
Moreover,
numerically
predicted
FRP-plated
beam
shows
around
5.5%
load
reduction
slip
plate
76%,
without
nanomaterial
incorporation.
Finally,
good
agreement
experimental
results,
taken
from
literature,
highlights
excellent
capability
simulate
behavior
such
types
structures,
emphasizing
beneficial
effects
nano-enhanced
systems.
Materials,
Год журнала:
2024,
Номер
17(3), С. 705 - 705
Опубликована: Фев. 1, 2024
Recent
studies
have
shown
that
the
mechanical
properties
of
bioinspired
periodic
composite
materials
can
be
strongly
influenced
by
finite
deformation
effects,
leading
to
highly
nonlinear
static
and
dynamic
behaviors
at
multiple
length
scales.
For
instance,
in
porous
nacre-like
microstructures,
microscopic
macroscopic
instabilities
may
occur
for
a
given
uniaxial
loading
process
and,
as
consequence,
wave
attenuation
evolve
function
microstructural
evolution,
designating
it
metamaterials.
The
numerical
outcomes
provide
new
opportunities
design
bioinspired,
soft
metamaterials
characterized
high
deformability
enhanced
elastic
capabilities
insertion
voids
lead
cores.
Materials & Design,
Год журнала:
2024,
Номер
243, С. 113024 - 113024
Опубликована: Май 15, 2024
In
recent
years,
the
design
and
development
of
negative-stiffness
metamaterials
metastructures
have
been
considered
a
research
field
with
great
potential
for
applications
such
as
energy
absorption
vibration
isolation.
As
particular
example,
it
is
known
that
reaction
force
typical
honeycomb
(NSH)
metastructure
under
compression
will
not
monotonically
increase
displacement,
but
manifests
successive
local
extremums.
This
makes
an
attractive
choice
concept
energy-absorbing
applications,
especially
recurrent
low-velocity
collision
scenarios.
Here,
we
analytically
derive
equations
piecewise-defined
force–displacement
functions
general
case
NSH
two-dimensional
lattice
followed
by
finding
optimal
geometric
parameters.
Using
analytical
methods,
demonstrate
there
fundamental
upper
limit
5/6
to
efficiency
metastructures.
The
obtained
theoretical
results
are
validated
finite-element
numerical
simulations
experimental
tests.
findings
this
study
enable
designers
identify
geometries
different
practical
requirements
on
maximum
displacement.
Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences,
Год журнала:
2024,
Номер
382(2278)
Опубликована: Июль 29, 2024
Predicting
failure
initiation
in
nonlinear
composite
materials,
often
referred
to
as
metamaterials,
is
a
fundamental
challenge
solid
mechanics.
Microstructural
mechanisms
encompass
fracture,
decohesion,
cavitation,
compression-induced
contact
and
instabilities,
affecting
their
unconventional
static
dynamic
performances.
To
fully
take
advantage
of
these
especially
extreme
applications,
it
imperative
predict
behaviour
using
reliable,
accurate
computationally
efficient
numerical
methodologies.
This
study
presents
an
innovative
homogenization-based
theoretical
framework
for
characterizing
the
periodic
reinforced
hyperelastic
composites
induced
by
reinforcement/matrix
decohesion
interaction
between
microscopic
instabilities.
Debonding
unilateral
different
phases
are
incorporated
employing
enhanced
cohesive/contact
model,
which
features
special
interface
constitutive
law
formulation
within
context
finite
strain
continuum
The
demonstrated
periodically
layered
subjected
macroscopic
compressive
loading
conditions
along
lamination
direction.
Numerical
results
illustrate
ways
debonding
phenomena,
conjunction
with
fibre
microbuckling,
may
influence
critical
loads
examined
solid.
sensitivity
obtained
through
proposed
contact–cohesive
model
at
respect
its
implementation
also
explored.
article
part
theme
issue
‘Current
developments
elastic
acoustic
metamaterials
science
(Part
1)’.
Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials,
Год журнала:
2024,
Номер
152, С. 106435 - 106435
Acta Acustica,
Год журнала:
2025,
Номер
9, С. 24 - 24
Опубликована: Янв. 1, 2025
Since
World
War
II,
there
have
been
many
efforts
worldwide
to
design
hull
coatings
for
naval
and
underwater
defense
applications
in
order
reduce
either
noise
radiated
from
the
(discretion)
or
acoustic
reflection
(stealth).
This
paper
presents
a
non-exhaustive
review
of
concepts
that
emerged
since
iconic
Alberich
coating
highlights
new
trends
promising
candidates,
such
as
metamaterials,
improve
discretion
stealth
performance
systems.
The
need
materials
is
first
explained,
along
with
some
specific
requirements
coatings.
Two
technologies,
called
micro-inclusion
macro-inclusion
coatings,
are
then
successively
reviewed.
New
also
presented
following
section.
concludes
by
introducing
frame
threats
industries
well
other
non-naval
areas,
opening
possibilities
their
design.
