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+//CHAPTER 4_ Motion and Dimensional Measurement

+//Caption : Strain gage

+// Example 3// Page 176

+disp("Rg=120")

+disp("Sg=2;")

+disp("Rs=120000")

+Rg=120;    // given

+Sg=2;  // gage factor

+Rs=120000   //('enter the value of shunt resistor=:')

+disp("The input bridge excitation is represented by Eex")

+A=10   //('enter the amplifier gain=:')

+// The shunt resistance has to be very large since we intend to measure only very small change in resistanc

+eo=30*10^-3    //('enter the unbalanced bridge voltage=:')

+dR=Rg/(Rg+Rs);

+r=1;//ratio of resistances of adjacent arms

+Eex=eo*(1+r)^2/(r*dR*A);

+printf('The input excitation voltage is %fd V\n',Eex)

+p1=2 *(1+v) // bridge factor

+Eo=.5   //('enter the voltmeter reading when shunt is removed=:')

+E_axial=Eo*(1+r)^2/(r*Sg*p1*Eex*A);

+printf(' Axial strain is %fd\n ',E_axial)

+E_trans=E_axial*v;

+printf('The transverse strain is -%fd',E_trans)