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+//Example 12.5
+//Infinite Life Design
+//Page No. 422
+clc;clear;close;
+
+Kt=1.68;               //no unit
+q=0.9;                 //no unit
+sigma_ed=42000;         //in psi
+Cs=0.9;                 //no unit
+Cf=0.75;               //no unit
+Cz=0.81;                //no unit
+Kf=q*(Kt-1)+1;
+sigma_e=sigma_ed*Cs*Cf*Cz;
+sigma_en=sigma_e/Kf;
+printf('\nFatigue Limit = %g psi',sigma_en);