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+//(Threaded Joints) Example 7.19
+//Maximum external force Pmax (kN)
+Pmax = 10
+//Minimum external force Pmin (kN)
+Pmin = 0
+//Assume the stiffness of the bolts to be 1N/mm kb
+kb = 1
+//Calculate the stiffness of the parts kc
+kc = 3 * kb
+//Overload percentage load (%)
+load = 50
+//Yield tensile strength of 50C4 Syt (N/mm2)
+Syt = 460
+//Ultimate tensile strength of 50C4 Sut (N/mm2)
+Sut = 660
+//Fatigue stress concentration factor Kf 
+Kf = 2.2
+//Expected reliability (%)
+reliability = 90
+//Factor of safety fs
+fs = 2
+//Assume diameter of the bolt to be less than 7.5mm for Kb to be 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