def test_calc_moisture_forces_invalid_input_errors(self):
"""Sends invalid inputs to the function, expects the proper error"""
(valid_lam, valid_mat_list) = assemble_valid_laminate()
valid_Z = clt.assemble_Z(valid_lam)
self.assertRaises(
clt.LaminateLayupError,
clt.calc_moisture_forces,
valid_mat_list,
valid_lam,
None # Tests for invalid Z_vector
)
self.assertRaises(
clt.LaminateLayupError,
clt.calc_moisture_forces,
valid_mat_list,
None, # Tests for invalid lam
valid_Z)
self.assertRaises(
clt.LaminateLayupError,
clt.calc_moisture_forces,
None, # Tests for invalid mat_list
valid_mat_list,
valid_Z)
def test_assemble_ABD_invalid_input_errors(self):
"""Sends invalid inputs to the function, expects the proper error"""
valid_mat_list = [
{
'X': 1
},
]
(valid_lam, _) = assemble_valid_laminate()
valid_Z = clt.assemble_Z(valid_lam)
self.assertRaises(
clt.LaminateLayupError,
clt.assemble_ABD,
valid_mat_list,
valid_lam,
None # Tests for invalid Z_vector
)
self.assertRaises(
clt.LaminateLayupError,
clt.assemble_ABD,
valid_mat_list,
None, # Tests for invalid lam
valid_Z)
self.assertRaises(
clt.LaminateLayupError,
clt.assemble_ABD,
None, # Tests for invalid mat_list
valid_mat_list,
valid_Z)
def test_known_layup_returns_expected_Z_vector(self):
"""Sends a lam with known correct Z_vector and compares to returned"""
(lam, _) = assemble_valid_laminate()
Z_vector = clt.assemble_Z(lam)
Z_vector = [round(z, 6) for z in Z_vector]
expected_Z_vector = [
-5e-04, -4e-04, -3e-04, -2e-04, -1e-04, 0, 1e-04, 2e-04, 3e-04,
4e-04, 5e-04
]
self.assertEqual(Z_vector, expected_Z_vector)
def test_assemble_ABD_known_input_returns_correct_result(self):
"""Sends known input to the function and expects a known output,
allowing for 0.1% error.
Values come from Nasa Mechanics of Laminated Composite Plates
Page 38 - Example 2"""
mat1 = {
"E1": 20010000.0,
"E2": 1301000.0,
"n12": 0.3,
"G12": 1001000.0,
}
mat_list = (mat1, )
# Initializes dictionary of the laminate layup configurations
# thk is thickness; ang is angle; mat_id is material id
lam = {"thk": [], "ang": [], "mat_id": []}
# Ply 1
lam['thk'].append(0.005)
lam['ang'].append(45)
lam['mat_id'].append(0)
# Ply 2
lam['thk'].append(0.005)
lam['ang'].append(0)
lam['mat_id'].append(0)
Z = clt.assemble_Z(lam)
expected_A = numpy.array([[133420, 24735,
23523], [24735, 39325, 23523],
[23523, 23523, 30819]])
expected_B = numpy.array([[169.6, -52.02, -58.80],
[-52.02, -65.59, -58.80],
[-58.80, -58.80, -52.02]])
expected_D = numpy.array([[1.1118, 0.2061, 0.1960],
[0.2061, 0.3277, 0.1960],
[0.1960, 0.1960, 0.2568]])
expected_ABD = numpy.zeros((6, 6))
expected_ABD[:3, :3] = expected_A
expected_ABD[:3, 3:6] = expected_ABD[3:6, :3] = expected_B
expected_ABD[3:6, 3:6] = expected_D
returned_ABD = clt.assemble_ABD(mat_list, lam, Z)
for rABD, eABD in zip(numpy.nditer(returned_ABD),
numpy.nditer(expected_ABD)):
if rABD == 0 or eABD == 0:
continue
else:
error = rABD / eABD
self.assertTrue(0.999 < error < 1.001)
def test_calc_moistures_forces_known_input_returns_expected_result(self):
"""Sends known input to the function and expects a known output,
allowing for 0.1% error.
Values come from Nasa Mechanics of Laminated Composite Plates
Page 53 - Example 5"""
mat1 = {
"E1": 20010000.0,
"E2": 1301000.0,
"n12": 0.3,
"G12": 1001000.0,
"b1": 0.01,
"b2": 0.35,
}
mat_list = (mat1, )
# Initializes dictionary of the laminate layup configurations
# thk is thickness; ang is angle; mat_id is material id
lam = {"thk": [], "ang": [], "mat_id": []}
# Ply 1
lam['thk'].append(0.005)
lam['ang'].append(0)
lam['mat_id'].append(0)
# Ply 2
lam['thk'].append(0.005)
lam['ang'].append(45)
lam['mat_id'].append(0)
# Ply 3
lam['thk'].append(0.005)
lam['ang'].append(45)
lam['mat_id'].append(0)
# Ply 4
lam['thk'].append(0.005)
lam['ang'].append(0)
lam['mat_id'].append(0)
Z = clt.assemble_Z(lam)
returned_Nm = clt.calc_moisture_forces(mat_list, lam, Z, dM=0.007)
expected_Nm = numpy.array([51.7, 60.4, -4.3])
for rNm, eNm in zip(numpy.nditer(returned_Nm),
numpy.nditer(expected_Nm)):
if rNm == 0 or eNm == 0:
continue
else:
error = rNm / eNm
self.assertTrue(0.999 < error < 1.001)
def test_calc_thermal_forces_known_input_returns_expected_result(self):
"""Sends known input to the function and expects a known output,
allowing for 0.1% error.
Values come from Nasa Mechanics of Laminated Composite Plates
Page 51 - Example 4"""
mat1 = {
"E1": 20010000.0,
"E2": 1301000.0,
"n12": 0.3,
"G12": 1001000.0,
"a1": -0.04e-6,
"a2": 18e-6,
}
mat_list = (mat1, )
# Initializes dictionary of the laminate layup configurations
# thk is thickness; ang is angle; mat_id is material id
lam = {"thk": [], "ang": [], "mat_id": []}
# Ply 1
lam['thk'].append(0.005)
lam['ang'].append(0)
lam['mat_id'].append(0)
# Ply 2
lam['thk'].append(0.005)
lam['ang'].append(45)
lam['mat_id'].append(0)
# Ply 3
lam['thk'].append(0.005)
lam['ang'].append(45)
lam['mat_id'].append(0)
# Ply 4
lam['thk'].append(0.005)
lam['ang'].append(0)
lam['mat_id'].append(0)
Z = clt.assemble_Z(lam)
returned_Nt = clt.calc_thermal_forces(mat_list, lam, Z, dT=-155.6)
expected_Nt = numpy.array([-33.57, -60.42, 12.83])
for rNt, eNt in zip(numpy.nditer(returned_Nt),
numpy.nditer(expected_Nt)):
if rNt == 0 or eNt == 0:
continue
else:
error = rNt / eNt
self.assertTrue(0.999 < error < 1.001)
def Profile(self, coord_sys, axis, var, step):
""" Plots stress/strain in LCS or MCS against Z vector. """
# Sets plot dimension
fig = plt.figure()
#plt.figure(figsize=(10, 8))
Z = clt.assemble_Z(self.lam)
X = {
"inf": np.zeros((self.num_layers)),
"sup": np.zeros((self.num_layers))
}
Y = {
"inf": np.zeros((self.num_layers)),
"sup": np.zeros((self.num_layers))
}
P = np.zeros((self.num_layers * 2, 2))
# Sets the proper names
if coord_sys == "MCS":
if axis == 0:
axis_name = "1"
elif axis == 1:
axis_name = "2"
else:
axis_name = "6"
else:
if axis == 0:
axis_name = "x"
elif axis == 1:
axis_name = "y"
else:
axis_name = "xy"
# Formats the plot
plt.title('Profile ' + coord_sys + '-' + axis_name + ' ' + var)
plt.xlabel(var + ' (' + coord_sys + '-' + axis_name + ')')
plt.ticklabel_format(style='sci', axis='x', scilimits=(0, 0))
plt.ylabel('Z coordinate')
plt.grid(True)
# Iterates the layers, add data to plot
for layer in range(self.num_layers):
X["inf"][layer] = self.res[step][coord_sys][var]["inf"][axis][
layer]
Y["inf"][layer] = Z[layer]
X["sup"][layer] = self.res[step][coord_sys][var]["sup"][axis][
layer]
Y["sup"][layer] = Z[layer + 1]
P[layer * 2] = [X["inf"][layer], Y["inf"][layer]]
P[layer * 2 + 1] = [X["sup"][layer], Y["sup"][layer]]
plt.fill_betweenx([P[layer * 2, 1], P[layer * 2 + 1, 1]],
[P[layer * 2, 0], P[layer * 2 + 1, 0]],
hatch="//",
facecolor="none",
edgecolor="r",
lw=1.0)
# Adds main lines
plt.plot(P[:, 0], P[:, 1], color="r", lw=2.5)
plt.plot([0] * (self.num_layers + 1), Z, color="b", lw=2.5)
# Displays the plot
if self.display:
plt.show()
if self.save:
fig.savefig("plots/profile.png")
plt.close(fig)
"""
def test_valid_layup_to_assemble_Z_returns_valid_numpy_array(self):
"""Z_vector returned by the function must always be a np.ndarray"""
(lam, _) = assemble_valid_laminate()
Z_vector = clt.assemble_Z(lam)
self.assertTrue(isinstance(Z_vector, numpy.ndarray))
