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+//Example 7.2
+//Fracture Stress
+//Page No. 246
+clc;clear;close;
+
+E=100;                        //in GPa
+E=E*10^9;                   //conversion to Pa
+Ys=1;                       //J/m^2
+a0=2.5*10^-10;                  //in m
+c=10^4*a0;
+sigma_f=(E*Ys/(4*c))^(1/2);
+sigma_f=sigma_f*10^-6;
+printf('Fracture Stress = %g MPa',sigma_f);