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+// exa 4.8 Pg 112
+clc;clear;close;
+
+// Given Data
+Sut=500;//MPa
+Syt=300;//MPa
+R=90/100;// reliability
+n=2;// factor of safety
+Tmin=-200;// N.m
+Tmax=500;// N.m
+
+Se_dash = 0.5*Sut;// MPa
+// for cold drawn steel
+ka=0.80;// surface finish factor
+kb=0.85;// size factor (assuming t<50 mm)
+kc=0.897;// reliability factor
+kd=1;// temperature factor
+ke=0.577;// load factor
+
+Ses=ka*kb*kc*kd*ke*Se_dash;// MPa( Endurance limit)
+Sys=ke*Syt;// MPa
+Tm=(Tmax+Tmin)/2;// N.m
+Ta=(Tmax-Tmin)/2;// N.m
+theta=atand(Ta/Tm);// degree
+Sms=Ses/tand(theta);//MPa
+Sas=Ses;//MPa
+tau_da=Sas/n;//MPa
+//tua_da=16*Ta/%pi/d**3
+d=(16*Ta*1000/%pi/tau_da)**(1/3);//mm
+printf('\n diameter of shaft = %.f mm',d)