Mechanics Based Design of Structures and Machines,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 20
Published: Dec. 8, 2024
The
lightweight
design
of
thin-walled
curved
structures
as
spherical
shells
are
frequently
implemented
in
architecture,
aerospace,
mechanical,
automotive,
nuclear,
and
defense
structures.
Under
the
transverse
loads,
may
largely
deform
hence
snap
from
one
equilibrium
position
to
other.
Thus,
this
work
aims
develop
a
mathematical
model
computational
solution
investigate
nonlinear
bending
snap-through
behavior
doubly
auxetic
metamaterial
shell
subjected
transversal
loading,
for
first
time.
is
composed
several
layers
through
thickness,
each
layer
manufactured
copper
(Cu)
matrix
reinforced
with
specified
weight
fraction
graphene
origami
(GOAM).
mechanical
properties
GOAM
panel
presented
described
by
functions
volume
folding
degree.
Three
types
GOAM-distributions
considered,
which
U-type,
X-type,
O-type.
theoretical
framework
Kirchhoff–Love
hypotheses
thin
von
Karman
type
nonlinearity
used
derive
governing
equations.
differential
quadrature
method
(DQM)
discretize
space
domain
convert
partial
equation
algebraic
equations
terms
displacement
field.
An
efficient
incremental
iterative
procedure
developed
solve
predict
behavior.
A
conversion
validation
isotropic
considered.
Several
numerical
results
conducted
considering
effects
changing
content,
distribution
pattern,
degree,
curvature
thickness.
For
panels
exhibiting
behavior,
increasing
leads
higher
limiting
load;
however,
instability
gap
enlarged.
Kufa Journal of Engineering,
Journal Year:
2025,
Volume and Issue:
16(1), P. 177 - 199
Published: Feb. 4, 2025
The
purpose
of
the
current
research
is
to
determine
effect
fiber
type,
volume
ratio,
and
matrix
type
on
vibration
properties
sandwich
beams
made
composite
face
sheet
core.
typical
structure
consists
three
layers:
sheets,
core,
adhesive
bonding,
in
this
research,
layer
between
sheets
core
was
abolished
by
preparing
overall
mold
with
fibers
inside
casting
resin
fill
parts.
are
from
a
polyester
or
epoxy
reinforced
glass
fiber,
carbon
hybrid
honeycomb
consisting
random
immersed
(polyester
epoxy).
22
were
constructed
conduct
testing.
results
obtained
experimentally
compared
ANSYS
R1
2022
software,
very
good
agreement.
Hybrid
achieved
highest
values
natural
frequency
for
(clamped-clamped)
boundary
conditions,
where
value
reached
(2037
Hz)
at
fraction
(23.14%)
(1804.5
(21.95%)
simply
supported
condition.
ZAMM ‐ Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik,
Journal Year:
2025,
Volume and Issue:
105(3)
Published: March 1, 2025
Abstract
A
coupled
thermal‐structural
dynamic
model
of
a
beam
under
non‐Fourier
thermal
shock
and
its
approximate
solution
are
developed
in
the
present
study.
Meanwhile,
analytical
for
thermally
induced
vibration
(TIV)
without
structural
coupling
effects
is
also
derived.
The
relaxation
ratio
(i.e.,
time
to
characteristic
structure)
introduced
represent
effect.
inertia
parameter,
rotational
parameter
on
TIV
behaviors
studied.
Results
indicate
that
with
specific
will
exhibit
unique
“resonance”
phenomenon,
where
frequencies
close
bending
moment
variation.
Furthermore,
influencing
factors
flutter
(TF)
explored,
including
ratio,
heat
flux
incident
angle,
uncouple
absolute
rotation
boundary
conditions.
It
found
TF
stability
not
related
larger
difference
between
angle
quasi‐static
implies
better
stability.
This
work
enhances
understanding
effect
role
behaviors,
extending
beyond
Fourier‐based
models.
