Fatigue & Fracture of Engineering Materials & Structures,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 9, 2024
ABSTRACT
Current
research
on
frost
heave‐induced
cracking
in
fractures
of
rock
masses
cold
regions
typically
assumes
that
are
fully
saturated.
However,
actual
engineering
practice,
mass
often
an
unsaturated
state.
Upon
freezing,
the
fracture
surfaces
subjected
to
a
complex
combination
gas
pressure,
freezing
and
ice
friction
forces.
This
study
investigates
crack
initiation
mechanisms
with
asymmetric
edge
cracks
under
gas‐ice
pressure
conditions.
Assuming
small
yield
range,
we
derive
calculation
formulas
for
after
stress
intensity
factor,
angle,
based
variable
function
elastic‐plastic
mechanics
theory.
Additionally,
improved
phase‐field
model
is
proposed
calculating
dynamic
propagation
mixed‐mode
I‐II
fractures,
key
parameters
analyzed
discussed.
The
results
demonstrate
that:
By
comparing
analytical
solutions
numerical
calculations,
validity
verified.
During
process,
will
exhibit
bifurcation.
At
higher
water
saturation
levels,
shows
pattern
initial
bifurcation
followed
by
subsequent
merging.
Computer Methods in Applied Mechanics and Engineering,
Год журнала:
2023,
Номер
414, С. 116169 - 116169
Опубликована: Июнь 26, 2023
This
paper
deals
with
the
numerical
simulation
of
initiation
and
propagation
mixed
mode
fracture
in
rocks.
A
bond-level
energy-based
peridynamic
model
is
developed
by
introducing
a
dilatation
function
to
capture
both
volumetric
deviatoric
deformations.
We
proceed
define
nonlocal
stresses
obtain
isotropic
forces
commensurate
then
come
up
new
failure
link
computational
peridynamics
some
phenomenological
criteria,
which
highly
relevant
for
brittle
quasi-brittle
Finally,
several
examples
mixed-mode
fractures
are
presented
show
performance
our
model.
