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clear
//
//Given
//Variable declaration
Dc=15 //Diameter of copper rod in mm
Di_s=20 //Internal diameter of steel in mm
De_s=30 //External diameter of steel in mm
T1=10 //Initial temperature in degree celsius
T2=200 //Raised temperature in degree celsius
Es=2.1e5 //Youngs modulus of steel in N/sq.mm
Ec=1e5 //Youngs modulus of copper in N/sq.mm
alpha_s=11e-6 //Co-efficient of linear expansion of steel in per degree celsius
alpha_c=18e-6 //Co-efficient of linear expansion of copper in per degree celsius
//Calculation
Ac=(%pi/4)*Dc**2 //Area of copper tube in sq.mm
As=(%pi/4)*(De_s**2-Di_s**2) //Area of steel rod in sq.mm
T=T2-T1 //Rise of temperature in degree celsius
sigmas=(((alpha_c-alpha_s)*T)/(((As/Ac)/Ec)+(1/Es)))
sigmac=(sigmas*(As/Ac))
//Result
printf("\n NOTE: The answers in the book for stresses are wrong.The correct answers are,")
printf("\n Stress in steel = %0.3f N/mm^2",sigmas)
printf("\n Stress in copper = %0.3f N/mm^2",sigmac)
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