def test_woehler_elementary_only_one_load_level():
data = pd.DataFrame(np.array([[350.0, 1e7], [350.0, 1e6]]),
columns=['load', 'cycles'])
fd = woehler.determine_fractures(data, 1e7).fatigue_data
with pytest.raises(
ValueError,
match=r"Need at least two load levels to do a Wöhler analysis."):
woehler.Elementary(fd).analyze().sort_index()
def test_woehler_probit_one_runout_load_level():
fd = woehler.determine_fractures(data_one_runout_load_level,
1e7).fatigue_data
expected = woehler.Elementary(fd).analyze()
with pytest.warns(
UserWarning,
match=
r"Probit needs at least two runout load levels. Falling back to Elementary."
):
wc = woehler.Probit(fd).analyze()
pd.testing.assert_series_equal(wc, expected)
def test_woehler_elementary_initialize_with_pandas_dataframe():
expected = pd.Series({
'SD_50': 362.5,
'k_1': 7.0,
'ND_50': 3e5,
'1/TN': 5.3,
'1/TS': 1.27
}).sort_index()
wc = woehler.Elementary(data).analyze().sort_index()
pd.testing.assert_index_equal(wc.index, expected.index)
np.testing.assert_allclose(wc.to_numpy(), expected.to_numpy(), rtol=1e-1)
def test_woehler_elementary_no_runouts():
expected = pd.Series({
'SD_50': 0.0,
'k_1': 7.0,
'1/TN': 5.3,
'1/TS': 1.27
}).sort_index()
fd = woehler.determine_fractures(data_no_runouts, 1e7).fatigue_data
wc = woehler.Elementary(fd).analyze().sort_index().drop('ND_50')
pd.testing.assert_index_equal(wc.index, expected.index)
np.testing.assert_allclose(wc.to_numpy(), expected.to_numpy(), rtol=1e-1)
def test_woehler_elementary_initialize_with_determined_fractures():
expected = pd.Series({
'SD_50': 362.5,
'k_1': 7.0,
'ND_50': 3e5,
'1/TN': 5.3,
'1/TS': 1.27
}).sort_index()
fd = woehler.determine_fractures(data, 1e7)
wc = woehler.Elementary(fd).analyze().sort_index()
pd.testing.assert_index_equal(wc.index, expected.index)
np.testing.assert_allclose(wc.to_numpy(), expected.to_numpy(), rtol=1e-1)