initial commit / add all books

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+// exa 4.16 Pg 122
+clc;clear;close;
+
+// Given Data
+Pmin=-15;// kN
+Pmax=25;// kN
+Se_dash=360;// MPa
+Sy=400;// MPa
+Ki=1.25;// impact factor
+n=2.25;// factor of safety
+ka=0.88;// surface finish factor
+Kt=2.25;// stress concentration factor
+Pm=(Pmax+Pmin)/2;// kN
+Pa=(Pmax-Pmin)/2;// kN
+q=0.8;// sensitivity factor
+
+// sigma_m=4*Pm/%pi/d**2
+sigma_m_into_d_sq = 4*Pm*1000/%pi;
+sigma_a_into_d_sq = 4*Pa*1000/%pi;
+Kf=1+q*(Kt-1);// fatigue strength factor
+kf=1/Kf ;// fatigue strength reduction factor
+kb=0.85;// size factor
+ke=0.9;//load factor
+ki=1/Ki;// reverse impact factor
+Se=ka*kb*ke*kf*ki*Se_dash;// MPa
+//soderburg failure equation - sigma_m/Sy+sigma_a/Se=1/n
+d=sqrt((sigma_m_into_d_sq/Sy+sigma_a_into_d_sq/Se)*n)
+printf('\n Size of piston rod, d = %.f mm',d)