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diff --git a/3864/CH6/EX6.18/Ex6_18.sce b/3864/CH6/EX6.18/Ex6_18.sce
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+clear
+//
+//
+
+//Initilization of Variables
+
+d1=60 //mm //External Diameter of aluminium Tube
+d2=40 //mm //Internal Diameter of aluminium Tube
+d=40  //mm //Diameter of steel tube
+q_a=60 //N/mm**2 //Permissible stress in aluminium
+q_s=100 //N/mm**2 //Permissible stress in steel tube
+G_a=27*10**3 //N/mm**2 
+G_s=80*10**3 //N/mm**2 
+
+//Calculations
+
+//Polar modulus of aluminium Tube
+J_a=%pi*32**-1*(d1**4-d2**4) //mm**4
+
+//Polar Modulus of steel Tube
+J_s=%pi*32**-1*d**4 //mm**4
+
+//Now the angle of twist of steel tube = angle of twist of aluminium tube
+//T_s*L_s*(J_s*theta_s)**-1=T_a*L_a*(J_a*theta_a)**-1
+//After substituting values in above Equation and Further simplifyin we get
+//T_s=0.7293*T_a   .....................(1)
+
+//If steel Governs the resisting capacity
+T_s1=q_s*J_s*(d*2**-1)**-1 //N-mm
+T_a1=T_s1*0.7293**-1  //N-mm
+T1=(T_s1+T_a1)*10**-6 //KN-m //Total Torque in steel Tube
+
+//If aluminium Governs the resisting capacity 
+T_a2=q_a*J_a*(d1*2**-1) //N-mm
+T_s2=T_a2*0.7293 //N-mm
+T2=(T_s2+T_a2)*10**-6 //KN-m //Total Torque in aluminium tube
+
+//Result
+printf("\n Steel Governs the torque carrying capacity %0.2f  KN-m",T1)