def e55_damage_element_size():
w_max = 0.1
po = PullOutModel(n_e_x=80, k_max=1000, w_max=w_max)
po.tline.step = 0.01
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.cross_section.set(A_f=16.67, P_b=1.0, A_m=1540.0)
po.material.set(K=100000.0, gamma=-0.0, tau_bar=45.0)
po.material.omega_fn.set(alpha_1=1.0, alpha_2=1000.0, plot_max=0.01)
po.geometry.L_x = 200.0
import pylab
n_e_array = [20, 40, 60, 80, 100]
for n_e_x in n_e_array:
po.n_e_x = n_e_x
po.run()
P = po.get_P_t()
w0, wL = po.get_w_t()
pylab.subplot(2, 2, 1)
pylab.plot(wL, P, label='n_e=%d' % n_e_x)
ax = pylab.subplot(2, 1, 2)
po.plot_sf(ax, 1.0)
pylab.legend()
pylab.show()
def e51_isotropic_negative_hardening():
'''Show the effect of strain softening represented
by kinematic or isotripic hardening.
'''
po = PullOutModel(n_e_x=100, k_max=500, w_max=0.1)
po.tline.step = 0.005
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.cross_section.set(A_f=16.67, P_b=1.0, A_m=1540.0)
po.geometry.L_x = 200.0
po.material.set(gamma=0.0, K=-100.0, tau_bar=10.0)
po.material.omega_fn.set(alpha_1=0.0, alpha_2=1.0, plot_max=10.0)
po.run()
show(po)
def e53_damage_softening():
'''Show the effect of strain softening represented
by negative kinematic hardening.
@todo: motivate fracture energy.
'''
po = PullOutModel(n_e_x=100, k_max=1000, w_max=0.62)
po.tline.step = 0.01
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.geometry.L_x = 100.0
po.cross_section.set(A_f=16.67, P_b=1.0, A_m=1540.0)
po.material.set(K=100000.0, gamma=0.0, tau_bar=45.0)
po.material.omega_fn.set(alpha_1=1.0, alpha_2=50.0, plot_max=0.62)
po.run()
show(po)
def e52_frp_lap_joint_test():
'''Show the effect of strain softening represented
by negative kinematic hardening.
The parameters were taken from
[Baena e. al. 2009]
'''
po = PullOutModel(n_e_x=100, k_max=1000, w_max=25.0)
po.tline.step = 0.01
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.geometry.L_x = 45.0
po.cross_section.set(A_f=64.0, P_b=28.0, A_m=28000.0)
po.material.set(K=-0.2, gamma=0.0, tau_bar=13.137)
po.material.set(E_m=35000.0, E_f=170000.0, E_b=6700.0)
po.material.omega_fn.set(alpha_1=0.0, alpha_2=1.0, plot_max=0.01)
po.run()
show(po)
def e54_damage_length_dependency():
w_max = 2.0
po = PullOutModel(n_e_x=100, k_max=1000, w_max=w_max)
po.tline.step = 0.01
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.geometry.L_x = 100.0
po.cross_section.set(A_f=16.67, P_b=1.0, A_m=1540.0)
po.material.set(K=100000.0, gamma=0.0, tau_bar=45.0)
po.material.omega_fn.set(alpha_1=1.0, alpha_2=50.0, plot_max=0.62)
sig_f_max = 2400.00
A_f = po.cross_section.A_f
P_f_max = A_f * sig_f_max
import pylab
L_max = np.log10(350.0)
L_array = np.logspace(0, L_max, 4)
for L in L_array:
po.geometry.L_x = L
po.run()
P = po.get_P_t()
w0, wL = po.get_w_t()
pylab.subplot(2, 1, 1)
pylab.plot(wL, P, label='L=%f' % L)
dG_bar = po.get_dG_t()
pylab.subplot(2, 1, 2)
pylab.plot(wL, dG_bar, label='L=%f' % L)
pylab.subplot(2, 1, 1)
pylab.plot([0.0, w_max], [P_f_max, P_f_max], label='yarn strength')
pylab.legend()
pylab.show()
show(po)
def e52_kinematic_hardening():
'''Show the effect of strain softening represented
by negative kinematic hardening.
@todo - fix - the values of stress upon loading should not
go to negative range.
'''
po = PullOutModel(n_e_x=10, k_max=50, w_max=0.05)
po.tline.step = 0.01
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.geometry.L_x = 1.0
po.cross_section.set(A_f=16.67, P_b=1.0, A_m=1540.0)
po.material.set(K=0.0, gamma=-5000.0, tau_bar=45.0)
po.material.omega_fn.set(alpha_1=0.0, alpha_2=1.0, plot_max=10.0)
po.run()
show(po)
def get_pullout_model_carbon_concrete(u_f0_max=5.0):
'''Helper method to get the constructing the default
configuration of the pullout model.
'''
'''Helper method to get the constructing the default
configuration of the pullout model.
'''
po = PullOutModel(n_e_x=100, k_max=1000, u_f0_max=u_f0_max)
po.tline.step = 0.01
po.loading_scenario.set(loading_type='cyclic')
po.loading_scenario.set(number_of_cycles=1)
po.geometry.L_x = 100.0
po.cross_section.set(A_f=16.67, P_b=1.0, A_m=1540.0)
po.material.set(K=100000.0, gamma=0.0, tau_bar=45.0)
po.material.omega_fn.set(alpha_1=1.0, alpha_2=50.0, plot_max=0.62)
return po
def get_pullout_model_carbon_concrete(u_f0_max=5.0):
'''Helper method to get the constructing the default
configuration of the pullout model.
'''
'''Helper method to get the constructing the default
configuration of the pullout model.
'''
po = PullOutModel(n_e_x=200, k_max=500, u_f0_max=u_f0_max)
po.tline.step = 0.005
po.loading_scenario.set(loading_type='cyclic',
amplitude_type='constant',
loading_range='non-symmetric'
)
po.loading_scenario.set(number_of_cycles=1,
unloading_ratio=0.98,
)
po.geometry.L_x = 100.0
po.cross_section.set(A_f=16.67, P_b=9.0, A_m=1540.0)
po.mats_eval.set(E_m=28480, E_f=170000)
po.mats_eval.set(gamma=1.5, K=0.0, tau_bar=5.0)
po.mats_eval.omega_fn.set(alpha_1=1.0, alpha_2=1, plot_max=2.8)
return po