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compression.py
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Wed, Nov 13, 08:36

compression.py
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#!/usr/bin/env python3
""" compression.py: Python contact mechanics example"""
__author__ = "Mohit Pundir"
__credits__ = [
"Mohit Pundir <mohit.pundir@epfl.ch>",
]
__copyright__ = "Copyright (©) 2018-2021 EPFL (Ecole Polytechnique Fédérale" \
" de Lausanne) Laboratory (LSMS - Laboratoire de Simulation" \
" en Mécanique des Solides)"
__license__ = "LGPLv3"
import akantu as aka
max_steps = 20000
max_displacement = 1e-2
damping_interval = 10
damping_ratio = 0.9
spatial_dimension = 2
aka.parseInput('compression.dat')
mesh = aka.Mesh(spatial_dimension)
mesh.read('compression.msh')
coupler = aka.CouplerSolidContact(mesh)
solid = coupler.getSolidMechanicsModel()
contact = coupler.getContactMechanicsModel()
material_selector = aka.MeshDataMaterialSelectorString("physical_names", solid)
solid.setMaterialSelector(material_selector)
coupler.initFull(_analysis_method=aka._explicit_lumped_mass)
surface_selector = aka.PhysicalSurfaceSelector(mesh)
detector = contact.getContactDetector()
detector.setSurfaceSelector(surface_selector)
solid.applyBC(aka.FixedValue(0.0, aka._x), "sides")
time_step = solid.getStableTimeStep()
time_step *= 0.1
coupler.setTimeStep(time_step)
coupler.setBaseName("compression")
coupler.addDumpFieldVector("displacement")
coupler.addDumpFieldVector("contact_force")
coupler.addDumpFieldVector("external_force")
coupler.addDumpFieldVector("internal_force")
coupler.addDumpField("gaps")
coupler.addDumpField("areas")
coupler.addDumpField("blocked_dofs")
coupler.addDumpField("grad_u")
coupler.addDumpField("stress")
coupler.dump()
velocity = solid.getVelocity()
increment = max_displacement / max_steps
for s in range(0, max_steps):
print("Step : ", s)
solid.applyBC(aka.IncrementValue(-increment, aka._y), "loading")
solid.applyBC(aka.IncrementValue(increment, aka._y), "fixed")
coupler.solveStep()
if s % damping_interval == 0:
velocity *= damping_ratio
if s % 100 == 0:
coupler.dump()

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