Mechanics Based Design of Structures and Machines,
Journal Year:
2023,
Volume and Issue:
52(6), P. 3011 - 3037
Published: April 11, 2023
This
paper
presents
a
generalized
vibration-based
multiple
breathing
crack
localization
technique
in
beams
with
an
unknown
number
of
cracks
based
on
Singular
Spectrum
Analysis
(SSA).
Localization
is
highly
challenging
inverse
problem,
as
all
these
(more
than
two)
might
be
similar
state
(either
opening
or
closing
state)
at
any
particular
time
instant
contrasting
states
(while
some
are
opening,
others
during
vibration.
The
level
nonlinearity
vibration
response
strongly
dependent
not
only
each
size,
and
location
but
also
the
application
driving
force
along
cracked
beam.
concept
varied
input
frequency
excitation
sources
employed
present
work
for
identification
over
tedious
traditional
approach
varying
positions.
major
advantage
using
singular
spectrum
analysis
that
it
can
reliably
isolate
extract
very
low-amplitude
nonlinear
sensitive
components
(super
harmonics
intermodulation)
being
buried
total
pairwise
eigenvalue
property
harmonic
components.
Investigations
have
been
carried
out
by
number,
spatial
locations,
intensities
cracks.
Sensitivities
associated
measurement
noise
limited
sensors
investigated.
results
both
numerical
experimental
investigations
this
concluded
proposed
SSA
effectively
localize
closely
spaced
sparsely
(i.e.,,
spatially
far
apart)
data-driven,
works
sensors,
does
need
reference
healthy
measurements.
Frontiers in Materials,
Journal Year:
2022,
Volume and Issue:
9
Published: Nov. 21, 2022
In
this
research
work,
different
combinations
of
normal
strength
concrete
(NSC),
ultra-high-performance
(UHPC),
and
steel
fiber-reinforced
UHPC
(SFR-UHPC)
with
re-bars
conventional
carbon
polymer
(C-FRP)
are
used
in
a
two-way
square
slab
size
1000mm
x
75mm
subjected
to
2500
mm
free-fall
impact
loading.
Experimental
arrangement
consisting
105
kg
dropping
weight
the
circular
flat
impacting
face
40
diameter
for
carrying
out
test
is
modeled
using
high-fidelity
physics-based
finite
element
computer
code,
ABAQUS/Explicit-v.6.15.
After
validating
experimental
results
NSC
bars,
analyses
extended
by
replacing
bars
UHPC/SFR-UHPC
C-FRP
respectively,
under
same
weight.
Only
remote
(tension
face)
slabs
provided
re-bars.
Widely
employed
available
ABAQUS,
Concrete
Damage
Plasticity
model
strain-rate
effects
has
been
entrusted
simulating
plastic
response.
Re-bars
idealized
Johnson-Cook
plasticity
damage
model.
defined
classical
following
elastic-plastic
constitutive
laws.
The
responses
NSC/UHPC/SFR-UHPC
steel,
considered
discussed
compared.
Slabs
made
found
offer
promising
combination
materials
withstand
low-velocity
load
little
extraordinary
performance.
International Journal Of Engineering & Applied Sciences,
Journal Year:
2025,
Volume and Issue:
17(1), P. 61 - 72
Published: May 1, 2025
In
this
research
article,
a
free
vibration
analysis
study
of
nanorings
using
nonlocal
elasticity
has
been
attempted.
Nanorings
are
involved
in
many
areas
our
lives.
It
is
seen
that
frequently
used,
especially
technological
tools.
study,
firstly
the
studies
carried
out
by
scientists
on
discussed
comprehensively.
particular,
these
related
to
theory
and
nanorings.
context,
after
literature
review,
an
attempt
was
made
express
elasticity.
By
simplest
equations
theory,
main
equation
obtained.
While
obtaining
equation,
number
mathematical
functions
used
from
equations.
obtained
for
studies.
After
elasticity,
discussed.
Here,
environment
embedded
elastic
soil.
addition,
new
crated
taking
''"k"
_"m"
''
value
zero
order
get
rid
environment,
is,
ground
effect.
dimensionless
frequency
As
result,
regarding
derived.
