def test_bladestiff2d_lb():
print('Testing linear buckling with BladeStiff2D')
spb = StiffPanelBay()
spb.a = 2.
spb.b = 1.
spb.stack = [0, +45, -45, 90, -45, +45]
spb.plyt = 1e-3 * 0.125
spb.laminaprop = (142.5e9, 8.7e9, 0.28, 5.1e9, 5.1e9, 5.1e9)
spb.model = 'plate_clt_donnell_bardell'
spb.m = 17
spb.n = 16
Nxx = -50.
spb.add_panel(y1=0, y2=spb.b / 2., plyt=spb.plyt, Nxx=Nxx)
spb.add_panel(y1=spb.b / 2., y2=spb.b, plyt=spb.plyt, Nxx=Nxx)
bb = spb.b / 5.
bf = bb
stiff = spb.add_bladestiff2d(ys=spb.b / 2.,
bf=bf,
bb=bb,
fstack=[0, 90, 90, 0] * 8,
fplyt=spb.plyt * 1.,
flaminaprop=spb.laminaprop,
bstack=[0, 90, 90, 0] * 4,
bplyt=spb.plyt * 1.,
blaminaprop=spb.laminaprop,
mf=17,
nf=16)
spb.calc_k0()
spb.calc_kG0()
eigvals, eigvecs = lb(spb.k0, spb.kG0, silent=True)
spb.plot_skin(eigvecs[:, 0],
filename='tmp_test_bladestiff2d_lb_skin.png',
colorbar=True)
spb.plot_stiffener(eigvecs[:, 0],
si=0,
region='flange',
filename='tmp_test_bladestiff2d_lb_stiff_flange.png',
colorbar=True)
calc = eigvals[0] * Nxx
spb.plot_skin(eigvecs[:, 0],
filename='tmp_test_bladestiff2d_lb_skin.png',
colorbar=True,
vec='w',
clean=False)
assert np.isclose(calc, -759.05689868085778, atol=0.0001, rtol=0.001)
def test_lb_Stiffener2D():
print('Testing linear buckling for StiffPanelBay with a 2D Stiffener')
spb = StiffPanelBay()
spb.a = 1.
spb.b = 0.5
spb.stack = [0, 90, 90, 0]
spb.plyt = 1e-3*0.125
spb.laminaprop = (142.5e9, 8.7e9, 0.28, 5.1e9, 5.1e9, 5.1e9)
spb.model = 'plate_clt_donnell_bardell'
spb.mu = 1.3e3
spb.m = 15
spb.n = 16
spb.add_panel(y1=0, y2=spb.b/2., plyt=spb.plyt, Nxx=-1.)
spb.add_panel(y1=spb.b/2., y2=spb.b, plyt=spb.plyt, Nxx_cte=1000.)
spb.add_bladestiff2d(ys=spb.b/2., m1=14, n1=11, bf=0.05,
fstack=[0, 90, 90, 0],
fplyt=spb.plyt, flaminaprop=spb.laminaprop)
k0 = spb.calc_k0(silent=True)
kG = spb.calc_kG0(silent=True)
eigvals, eigvecs = lb(k0, kG, silent=True)
assert np.isclose(eigvals[0].real, 301.0825234, atol=0.1, rtol=0)
def test_lb_Stiffener2D():
print('Testing linear buckling for StiffPanelBay with a 2D Stiffener')
spb = StiffPanelBay()
spb.a = 1.
spb.b = 0.5
spb.stack = [0, 90, 90, 0]
spb.plyt = 1e-3 * 0.125
spb.laminaprop = (142.5e9, 8.7e9, 0.28, 5.1e9, 5.1e9, 5.1e9)
spb.model = 'plate_clt_donnell_bardell'
spb.mu = 1.3e3
spb.m = 15
spb.n = 16
spb.add_panel(y1=0, y2=spb.b / 2., plyt=spb.plyt, Nxx=-1.)
spb.add_panel(y1=spb.b / 2., y2=spb.b, plyt=spb.plyt, Nxx_cte=1000.)
spb.add_bladestiff2d(ys=spb.b / 2.,
m1=14,
n1=11,
bf=0.05,
fstack=[0, 90, 90, 0],
fplyt=spb.plyt,
flaminaprop=spb.laminaprop)
k0 = spb.calc_k0(silent=True)
kG = spb.calc_kG0(silent=True)
eigvals, eigvecs = lb(k0, kG, silent=True)
assert np.isclose(eigvals[0].real, 301.0825234, atol=0.1, rtol=0)
def test_tstiff2d_lb():
#NOTE reference values taken from
# compmech.panel.assembly.tstiff2d_1stiff_compression
a_b_list = [0.5, 2., 10.]
ref_values = [-152.607275551, -80.15391295315146, -79.39137361313862]
for a_b, ref_value in zip(a_b_list, ref_values):
print('Testing linear buckling')
spb = StiffPanelBay()
spb.b = 1.
spb.a = spb.b * a_b
spb.stack = [0, +45, -45, 90, -45, +45]
spb.plyt = 1e-3 * 0.125
spb.laminaprop = (142.5e9, 8.7e9, 0.28, 5.1e9, 5.1e9, 5.1e9)
spb.model = 'plate_clt_donnell_bardell'
spb.m = 12
spb.n = 13
Nxx = -10.
spb.add_panel(y1=0, y2=spb.b / 2., plyt=spb.plyt, Nxx=Nxx)
spb.add_panel(y1=spb.b / 2., y2=spb.b, plyt=spb.plyt, Nxx=Nxx)
bb = spb.b / 5.
if False:
stiff = spb.add_tstiff2d(ys=spb.b / 2.,
bf=bb / 2,
bb=bb,
fstack=[0, 90, 90, 0] * 8,
fplyt=spb.plyt * 1.,
flaminaprop=spb.laminaprop,
bstack=[0, 90, 90, 0] * 4,
bplyt=spb.plyt * 1.,
blaminaprop=spb.laminaprop,
mb=13,
nb=12,
mf=13,
nf=12,
Nxxf=Nxx)
spb.calc_k0()
spb.calc_kG0()
eigvals, eigvecs = lb(spb.k0, spb.kG0, silent=True)
calc = eigvals[0] * Nxx
assert np.isclose(calc, ref_value, rtol=0.05)
def test_tstiff2d_lb():
#NOTE reference values taken from
# compmech.panel.assembly.tstiff2d_1stiff_compression
a_b_list = [0.5, 2., 10.]
ref_values = [-152.607275551, -80.15391295315146, -79.39137361313862]
for a_b, ref_value in zip(a_b_list, ref_values):
print('Testing linear buckling')
spb = StiffPanelBay()
spb.b = 1.
spb.a = spb.b * a_b
spb.stack = [0, +45, -45, 90, -45, +45]
spb.plyt = 1e-3*0.125
spb.laminaprop = (142.5e9, 8.7e9, 0.28, 5.1e9, 5.1e9, 5.1e9)
spb.model = 'plate_clt_donnell_bardell'
spb.m = 12
spb.n = 13
Nxx = -10.
spb.add_panel(y1=0, y2=spb.b/2., plyt=spb.plyt, Nxx=Nxx)
spb.add_panel(y1=spb.b/2., y2=spb.b, plyt=spb.plyt, Nxx=Nxx)
bb = spb.b/5.
if False:
stiff = spb.add_tstiff2d(ys=spb.b/2., bf=bb/2, bb=bb,
fstack=[0, 90, 90, 0]*8,
fplyt=spb.plyt*1., flaminaprop=spb.laminaprop,
bstack=[0, 90, 90, 0]*4,
bplyt=spb.plyt*1., blaminaprop=spb.laminaprop,
mb=13, nb=12, mf=13, nf=12, Nxxf=Nxx)
spb.calc_k0()
spb.calc_kG0()
eigvals, eigvecs = lb(spb.k0, spb.kG0, silent=True)
calc = eigvals[0]*Nxx
assert np.isclose(calc, ref_value, rtol=0.05)
