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+//CHAPTER 10 ILLUSRTATION 6 PAGE NO 272

+//TITLE:Brakes and Dynamometers

+clc

+clear

+//===========================================================================================

+//INPUT DATA

+d=0.5;//Drum diamter in m

+U=0.3;//Coefficient of friction

+q=250;//Angle of contact in degree

+P=750;//Force in N

+a=0.1;//Band width in m

+b=0.8;//Distance in m

+ft=(70*10^6);//Tensile stress in Pa

+f=(60*10^6);//Stress in Pa

+b1=0.1;//Distance in m

+

+T=exp(U*(q*(3.14/180)));//Tensions ratio

+T2=(P*b*10)/(T+1);//Tension in N

+T1=(T*T2);//Tension in N

+TB=(T1-T2)*(d/2);//Torque in N.m

+t=(max(T1,T2)/(ft*a))*1000;//Thickness in mm

+M=(P*b);//bending moment at fulcrum in Nm

+X=(M/((1/6)*f));//Value of th^2

+//t varies from 10mm to 15 mm. Taking t=15mm,

+h=sqrt(X/(0.015))*1000;//Section of the lever in m

+

+printf('Torque required is %3.2f N.m \nThickness necessary to limit the tensile stress to 70 MPa is %3.3f mm \n Section of the lever taking stress to 60 MPa is %3.1f mm',TB,t,h)