9: Photoelasticity

Example number 9.1, Page number 10

In [1]:
#importing modules
import math
from __future__ import division

#Variable declaration
alpha1_alpha2=10*10**8;   #difference between pincipal stress(N/m**2)
c=1*10**-12;    #stress optic coefficient(m**2/N)

#Calculation
N=c*alpha1_alpha2;   #difference between refractive indices

#Result
print "difference between refractive indices is",N

difference between refractive indices is 0.001

Example number 9.2, Page number 10

In [3]:
#importing modules
import math
from __future__ import division

#Variable declaration
alpha1=405*10**6;    #principal stress(N/m**2)
alpha2=-105*10**6;   #principal stress(N/m**2)

#Calculation
tow_max=(alpha1-alpha2)/2;   #maximum shearing stress(N/m**2)

#Result
print "maximum shearing stress is",tow_max*10**-6,"*10**6 N/m**2"

maximum shearing stress is 255.0 *10**6 N/m**2