Calculate Strain in a Structure

I have an ultrasonic transducer in which I calculate the following

calc
     disp
     strs
     eqep total
     pres acoustic
     max aprs * pmax
     end

Then, I use the following code to calculate these three tensors

proc plot save
exec $nexec2

data
out ydsp
out sgyy
out sgxx
out eqte
end

end$ proc

I can see the change in the values of stress either sgyy or sgxx but not eqte. 

I don't see a change in eqte with time like I see for sgyy or sgxx even if I reduce the min and max range.