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test_westergaard.py
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Tue, Apr 30, 13:20

test_westergaard.py
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# -*- coding: utf-8 -*-
#
# Copyright (©) 2016-2021 EPFL (École Polytechnique Fédérale de Lausanne),
# Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from __future__ import division, print_function
import tamaas as tm
import pytest
from conftest import pkridfn
from numpy.linalg import norm
@pytest.fixture(scope="module",
params=[tm.PolonskyKeerRey.pressure,
tm.PolonskyKeerRey.gap],
ids=pkridfn)
def pkr(westergaard, request):
loads = {
tm.PolonskyKeerRey.pressure: westergaard.load,
tm.PolonskyKeerRey.gap: 0.06697415181446396
}
model = tm.ModelFactory.createModel(tm.model_type.basic_1d, [1.],
[westergaard.n])
model.E, model.nu = westergaard.e_star, 0
solver = tm.PolonskyKeerRey(model, westergaard.surface, 1e-12,
request.param,
request.param)
solver.max_iter = 5000
solver.solve(loads[request.param])
return model, westergaard
def test_energy(pkr):
model, sol = pkr
traction, displacement = model['traction'], model['displacement']
error = norm((traction - sol.pressure)*(displacement - sol.displacement))
error /= norm(sol.pressure * sol.displacement)
assert error < 4e-6
@pytest.mark.xfail(tm.TamaasInfo.backend == 'tbb',
reason='TBB reductions are unstable?')
def test_pkr_multi(westergaard):
model_basic = tm.ModelFactory.createModel(tm.model_type.basic_1d, [1.],
[westergaard.n])
model_volume = tm.ModelFactory.createModel(tm.model_type.volume_1d,
[1., 1.],
[20, westergaard.n])
pressures = {}
for model in [model_basic, model_volume]:
print(model)
solver = tm.PolonskyKeerRey(model, westergaard.surface, 1e-12,
tm.PolonskyKeerRey.pressure,
tm.PolonskyKeerRey.pressure)
solver.solve(westergaard.load)
pressures[model] = model['traction']
error = norm(pressures[model_basic] - pressures[model_volume][:, 1])\
/ westergaard.load
assert error < 1e-16
if __name__ == "__main__":
print("Test is meant to run with pytest")

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