International Journal of Plasticity,
Год журнала:
2023,
Номер
171, С. 103824 - 103824
Опубликована: Ноя. 23, 2023
This
study
unveils
the
presence
of
size
effect
not
only
in
plastic
regime
but
also
elastic
under
strain
gradient.
discovery
emerges
from
a
comprehensive
set
experiments
encompassing
micro-cantilever
bending
and
micro-pillar
compression
tests.
Subsequent
finite
element
analysis
serves
to
expose
limitation
classical
continuum
theory
effectively
demonstrate
enhanced
predictive
capabilities
couple
stress
both
effects.
To
incorporate
theory,
systematic
rigorous
analysis-based
optimization
was
devised
determine
length
scale
parameters,
which
are
additional
material
properties
theory.
The
resulting
parameters
for
polycrystalline
copper
were
found
be
0.536
0.669μm
regimes,
respectively.
explores
physical
interpretation
these
regimes.
International Journal of Engineering Science,
Год журнала:
2023,
Номер
193, С. 103966 - 103966
Опубликована: Окт. 13, 2023
Smart
composites
(SCs)
are
utilized
in
electro-mechanical
systems
such
as
actuators
and
energy
harvesters.
Typically,
thin-walled
components
beams,
plates,
shells
employed
structural
elements
to
achieve
the
mechanical
behavior
desired
these
composites.
SCs
exhibit
various
advanced
properties,
ranging
from
lower
order
phenomena
like
piezoelectricity
piezomagneticity,
higher
effects
including
flexoelectricity
flexomagneticity.
The
recently
discovered
flexomagneticity
smart
has
been
investigated
under
limited
conditions.
A
review
of
existing
literature
indicates
a
lack
evaluation
three-dimensional
(3D)
elasticity
analysis
when
flexomagnetic
effect
(FM)
exists.
To
address
this
issue,
governing
equations
will
incorporate
term
∂/∂z,
where
z
represents
thickness
coordinate.
variational
technique
guide
us
further
developing
equations.
By
using
hypotheses
theories
3D
beam
model,
von
Kármán's
strain
nonlinearity,
Hamilton's
principle,
well-established
direct
converse
FM
models,
we
derive
constitutive
for
thick
composite
beam.
Conducting
implies
that
gradient
tensors
must
be
expressed
forms.
inclusion
∂/∂z
necessitates
construction
different
model.
It
should
noted
current
commercial
finite
element
codes
not
equipped
accurately
adequately
handle
micro-
nano-sized
solids,
thus
making
it
impractical
model
structure
programs.
Therefore,
transform
derived
characteristic
linear
bending
into
semi-analytical
Polynomial
domain
obtain
numerical
results.
This
study
demonstrates
importance
conducting
analyses
explore
coupling
multiple
physical
structures.
Mathematical and Computational Applications,
Год журнала:
2025,
Номер
30(1), С. 5 - 5
Опубликована: Янв. 7, 2025
This
paper
explores
the
vibration
behaviour
of
an
elastically
constrained
graphene
origami-enabled
auxetic
metamaterial
beam
subject
to
a
harmonic
external
force.
The
effective
mechanical
properties
are
approximated
using
micromechanical
model
trained
via
genetic
algorithm
provided
in
literature.
three
coupled
equations
motion
solved
numerically;
set
trigonometric
functions
is
used
approximate
displacement
components.
accuracy
proposed
confirmed
by
comparing
it
with
natural
frequencies
simplified
non-metamaterial
structure
available
Following
this
validation,
investigation
extends
investigate
forced
response
beam,
examining
influence
origami
distribution
pattern
and
content,
folding
degree,
linear
shear
layer
stiffness,
geometrical
parameters
on
dynamic
structure.
results
generally
highlight
considerable
effect
layer,
modelled
as
Pasternak
foundation,
beams.
Mechanics Based Design of Structures and Machines,
Год журнала:
2023,
Номер
52(6), С. 3229 - 3251
Опубликована: Апрель 12, 2023
In
the
present
exploration,
unconventional
tensors
of
nonlocal
stress
and
couple
are
incorporated
simultaneously
in
in-plane
nonlinear
stability
analysis
functionally
graded
(FG)
multilayer
shallow
micro/nano-arches
under
thermomechanical
loading
conditions.
For
this
purpose,
(NCS)
mechanics
continuum
is
implemented
into
third-order
shear
flexible
arch
theory
incorporating
von
Karman
kinematical
nonlinearity.
The
nanocomposite
material
FG
reinforced
with
graphene
nanofillers
accordance
different
patterns
lamination.
generalized
differential
quadrature
numerical
strategy
conjunction
pseudo
arc-length
continuation
procedure
employed
to
deduce
roles
NCS-based
paths
loaded
micro/nano-arches.
It
found
that
for
all
lamination,
contributions
associated
nonlocality
small
scale
effects
on
value
upper
limit
as
well
first
bifurcation
compressive
loads
less
than
those
lower
second
ones.
Also,
it
demonstrated
by
combining
a
temperature
rise
applied
lateral
load,
load
increases,
while
one
decreases.
Furthermore,
seen
applying
rise,
an
initial
deflection
induced
micro/nano-arch
before
load.
