-->//(Threaded Joints) Example 7.21
 
-->//Maximum internal pressure MAXP (MPa)
 
-->MAXP = 2
 MAXP  =
 
    2.  
 
-->//Minimum internal pressure MINP (MPa)
 
-->MINP = 0
 MINP  =
 
    0.  
 
-->//Diameter of the circle on which pressure acts D (mm)
 
-->D = 400
 D  =
 
    400.  
 
-->//Assume the stiffness of the bolts to be 1N/mm kb
 
-->kb = 1
 kb  =
 
    1.  
 
-->//Calculate the stiffness of the parts kc (N/mm)
 
-->kc = 4 * kb
 kc  =
 
    4.  
 
-->//Ultimate tensile strength Sut (N/mm2)
 
-->Sut = 900
 Sut  =
 
    900.  
 
-->//Yield strength Syt (N/mm2)
 
-->Syt = 700
 Syt  =
 
    700.  
 
-->//Endurance limit in bending Sdash (N/mm2)
 
-->Sdash = 300
 Sdash  =
 
    300.  
 
-->//Fatigue stress concentration factor Kf
 
-->Kf = 2.2
 Kf  =
 
    2.2  
 
-->//Factor of safety fs
 
-->fs = 1.5
 fs  =
 
    1.5  
 
-->//Number of bolts N
 
-->N = 8
 N  =
 
    8.  
 
-->//Assume expected reliability (%)
 
-->reliability = 90
 reliability  =
 
    90.  
 
-->//Assume diameter of the bolt to be less than 7.5mm for Kb to be 1
 
-->d = 1
 d  =
 
    1.  
 
-->//As Ka is incorporated into Kf, assume the assembly to be ground
 
-->//This is just to obtain a random value of Ka
 
-->op = 1
 op  =
 
    1.  
 

Core cross-section area of the bolt(A) = 85.172067 mm2