bree = axisym.BreeProblem([Ri, Ro], [mat], [n],
lambda r, t: 0.0,
p_int,
p_ext=p_ext)
bree.step(1.0)
print("Bree problem:")
print("'Hoop' stress")
print("\tModel\t\t%f" % bree.stresses[-1][0])
print("\tAnalytic\t%f" % ((pi * Ri - po * Ro) / (Ro - Ri)))
print("\n")
axi = axisym.AxisymmetricProblem([Ri, Ro], [mat], [n],
lambda r, t: 0.0,
p_int,
p_ext=p_ext)
axi.step(1.0)
s_inner = axi.stresses[-1][0][0]
s_outer = axi.stresses[-1][-1][0]
s_theta = lambda r: ((pi * Ri**2.0) / (Ro**2.0 - Ri**2.0) *
(1.0 + Ro**2.0 / r**2.0) - (po * Ro**2.0) /
(Ro**2.0 - Ri**2.0) * (1.0 + Ri**2.0 / r**2.0))
s_radial = lambda r: (pi * Ri**2.0 / (Ro**2.0 - Ri**2.0) *
(1.0 - Ro**2.0 / r**2.0) - po * Ro**2.0 /
(Ro**2.0 - Ri**2.0) * (1.0 - Ri**2.0 / r**2.0))
s_axial = lambda r: pi * Ri**2.0 / (Ro**2.0 - Ri**2.0) - po * Ro**2.0 / (
Ro**2.0 - Ri**2.0)
Ri,
T1,
T2,
Tdot_hot,
thold,
Tdot_cold=Tdot_cold,
delay=tramp)
def pressure(t):
if t < tramp:
return p / tramp * t
else:
return p
amodel = axisym.AxisymmetricProblem(
[Ri, Ri + tclad, Ro], [clad, base],
[int(tclad / msize), int((t - tclad) / msize)], gradient, pressure)
ts_period = np.concatenate(
(np.linspace(0, theat,
num=nheat), np.linspace(theat, theat + thold, num=nhold),
np.linspace(theat + thold, theat + thold + tcool, num=ncool)))
ts_ramp = np.linspace(0, tramp, nramp)
times = [ts_ramp]
for i in range(ncycles):
times.append(ts_period + times[-1][-1])
times = np.concatenate(times)
E = 100000.0
nu = 0.3
cte = 1.0e-3
base = gen_material(E, nu, cte)
Ro = 1750.0
t = 50.0
T1 = 0.0
T2 = 100.0
time = 100.0
def temperature(r, t):
return T1 + (T2-T1)/time * t
def pressure(t):
return 0.0
times = np.linspace(0, time, 51)
amodel = axisym.AxisymmetricProblem([Ro-t,Ro], [base],
[25], temperature, pressure, constrained = True)
for t in times[1:]:
amodel.step(t)
stresses = np.array(amodel.stresses)
print(np.mean(stresses[-1,:,0,2]))
print(-(T2-T1) * E * cte)