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plate.py
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Created
Tue, Aug 27, 19:02
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3 KB
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text/x-python
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Thu, Aug 29, 19:02 (2 d)
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blob
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rAKA akantu
plate.py
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#!/usr/bin/env python3
__copyright__
=
(
"Copyright (©) 2019-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)"
"Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)"
)
__license__
=
"LGPLv3"
import
akantu
as
aka
import
numpy
as
np
def
initialize_model
(
model
):
"""Initialize the model."""
cohesive_selector
=
aka
.
MaterialCohesiveRulesSelector
(
model
,
{
(
"Top"
,
"Bottom"
):
"tough"
,
(
"Top"
,
"Top"
):
"soft"
,
(
"Bottom"
,
"Bottom"
):
"soft"
,
})
model
.
setMaterialSelector
(
cohesive_selector
)
model
.
initFull
(
_analysis_method
=
aka
.
_static
,
_is_extrinsic
=
True
)
model
.
initNewSolver
(
aka
.
_explicit_lumped_mass
)
def
set_dumpers
(
model
):
"""Set the dumpers."""
model
.
setBaseName
(
"plate"
)
model
.
addDumpFieldVector
(
"displacement"
)
model
.
addDumpFieldVector
(
"external_force"
)
model
.
addDumpField
(
"strain"
)
model
.
addDumpField
(
"stress"
)
model
.
addDumpField
(
"blocked_dofs"
)
model
.
setBaseNameToDumper
(
"cohesive elements"
,
"cohesive"
)
model
.
addDumpFieldVectorToDumper
(
"cohesive elements"
,
"displacement"
)
model
.
addDumpFieldToDumper
(
"cohesive elements"
,
"damage"
)
model
.
addDumpFieldVectorToDumper
(
"cohesive elements"
,
"tractions"
)
model
.
addDumpFieldVectorToDumper
(
"cohesive elements"
,
"opening"
)
def
do_static_step
(
model
):
"""Do a static step."""
solver
=
model
.
getNonLinearSolver
(
"static"
)
solver
.
set
(
"max_iterations"
,
100
)
solver
.
set
(
"threshold"
,
1e-10
)
solver
.
set
(
"convergence_type"
,
aka
.
SolveConvergenceCriteria
.
residual
)
model
.
solveStep
(
"static"
)
model
.
dump
()
model
.
dump
(
"cohesive elements"
)
def
solve
(
material_file
,
mesh_file
,
traction
):
"""Define the main problem."""
aka
.
parseInput
(
material_file
)
spatial_dimension
=
2
# -------------------------------------------------------------------------
# Initialization
# -------------------------------------------------------------------------
mesh
=
aka
.
Mesh
(
spatial_dimension
)
mesh
.
read
(
mesh_file
)
model
=
aka
.
SolidMechanicsModelCohesive
(
mesh
)
initialize_model
(
model
)
set_dumpers
(
model
)
# -------------------------------------------------------------------------
# Boundary conditions
# -------------------------------------------------------------------------
model
.
applyBC
(
aka
.
FixedValue
(
0.0
,
aka
.
_x
),
"XBlocked"
)
model
.
applyBC
(
aka
.
FixedValue
(
0.0
,
aka
.
_y
),
"YBlocked"
)
trac
=
np
.
zeros
(
spatial_dimension
)
trac
[
int
(
aka
.
_y
)]
=
traction
print
(
"Solve for traction "
,
traction
)
model
.
getExternalForce
()[:]
=
0
model
.
applyBC
(
aka
.
FromTraction
(
trac
),
"Traction"
)
do_static_step
(
model
)
model
.
setTimeStep
(
model
.
getStableTimeStep
()
*
0.1
)
maxsteps
=
1000
for
i
in
range
(
0
,
maxsteps
):
print
(
"{0}/{1}"
.
format
(
i
,
maxsteps
))
model
.
checkCohesiveStress
()
model
.
solveStep
(
"explicit_lumped"
)
if
i
%
10
==
0
:
model
.
dump
()
model
.
dump
(
"cohesive elements"
)
# -----------------------------------------------------------------------------
if
__name__
==
"__main__"
:
mesh_file
=
"plate.msh"
material_file
=
"material.dat"
traction
=
0.095
solve
(
material_file
,
mesh_file
,
traction
)
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