Chapter 8: Failure

Example 8.1 Page no 217

In [3]:
sigma=40*10**6    # in Pa  Tensile stress
E=69*10**9        #Modulus of elaticity  in pa
Ys=0.3            #Specific surface energy  in N/m**2

a=2*E*Ys/(math.pi*sigma**2)

print"Maximum lemgth of a surface flaw without fracture is ",round(a*10**6,1),"micro m"

Maximum lemgth of a surface flaw without fracture is  8.2 micro m

Design Example 8.2 Page no 242

In [16]:
T=800.0+273.0      # Temperature in K

import math
L_M=24*10**3
t=math.pow(10,(L_M/T)-20)
    
print"Time to rupture is ",round(t,0),"h"

Time to rupture is  233.0 h
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