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+// exa 4.4 Pg 105
+clc;clear;close;
+
+// Given Data
+Sut=440;//MPa
+w=60;//mm
+d=12;// mm
+P=20;// kN
+q=0.8;// sensitivity factor
+R=90/100;// reliability
+n=2;// factor of safety
+
+Kt=2.52;// stress concentration factor
+Se_dash = 0.5*Sut;// MPa
+// for hot rollednormalized condition
+ka=0.67;// surface finish factor
+kb=0.85;// size factor (assuming t<50 mm)
+kc=0.897;// reliability factor
+kd=1;// temperature factor
+ke=0.9;// load factor
+dBYw=d/w; //(for circular hole)
+
+Kf=1+q*(Kt-1);// fatigue strength factor
+kf=1/Kf ;// fatigue strength reduction factor
+Se=ka*kb*kc*kd*ke*kf*Se_dash;// (MPa) Endurance limit
+sigma_d=Se/n;// MPa (design stress)
+// sigma_max=P/(w-d)/t
+sigma_max_into_t = P*1000/(w-d);
+// putting sigma_max=sigma_d
+t=sigma_max_into_t/sigma_d;// mm
+printf('\n Thickness of plate = %.2f mm or 20 mm',t)
+
+