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rAKA/examples/python/plate-hole/plate.py
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plate.py
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#!/usr/bin/env python3
from __future__ import print_function
import akantu
import numpy as np
################################################################
# Dirichlet Boudary condition functor: fix the displacement
################################################################
class FixedValue(akantu.DirichletFunctor):
def __init__(self, value, axis):
super().__init__(axis)
self.value = value
self.axis = int(axis)
def __call__(self, node, flags, disp, coord):
# sets the displacement to the desired value in the desired axis
disp[self.axis] = self.value
# sets the blocked dofs vector to true in the desired axis
flags[self.axis] = True
################################################################
# Neumann Boudary condition functor: impose a traction
################################################################
class FromTraction(akantu.NeumannFunctor):
def __init__(self, traction):
super().__init__()
self.traction = traction
def __call__(self, quad_point, force, coord, normals):
# sets the force to the desired value in the desired axis
force[:] = self.traction
################################################################
def solve(material_file, mesh_file, traction):
akantu.parseInput(material_file)
spatial_dimension = 2
################################################################
# Initialization
################################################################
mesh = akantu.Mesh(spatial_dimension)
mesh.read(mesh_file)
model = akantu.SolidMechanicsModel(mesh)
model.initFull(akantu.SolidMechanicsModelOptions(akantu._static))
model.setBaseName("plate")
model.addDumpFieldVector("displacement")
model.addDumpFieldVector("external_force")
model.addDumpField("strain")
model.addDumpField("stress")
model.addDumpField("blocked_dofs")
################################################################
# Boundary conditions
################################################################
model.applyBC(FixedValue(0.0, akantu._x), "XBlocked")
model.applyBC(FixedValue(0.0, akantu._y), "YBlocked")
trac = np.zeros(spatial_dimension)
trac[1] = traction
print("Solve for traction ", traction)
model.getExternalForce()[:] = 0
model.applyBC(FromTraction(trac), "Traction")
solver = model.getNonLinearSolver()
solver.set("max_iterations", int(2))
solver.set("threshold", 1e-10)
solver.set("convergence_type", akantu._scc_residual)
model.solveStep()
model.dump()
################################################################
# main
################################################################
def main():
import os
mesh_file = 'plate.msh'
# if mesh was not created the calls gmsh to generate it
if not os.path.isfile(mesh_file):
import subprocess
ret = subprocess.call(
'gmsh -format msh2 -2 plate.geo {0}'.format(mesh_file), shell=True)
if not ret == 0:
raise Exception(
'execution of GMSH failed: do you have it installed ?')
material_file = 'material.dat'
traction = 1.
solve(material_file, mesh_file, traction)
################################################################
if __name__ == "__main__":
main()
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