1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Is constitutive equation for piezo wrong?

  1. Nov 21, 2012 #1
    the linear constitutive equation describes piezo behavior. See wiki. But I can find an example in which linear relationship may not satisfy. Given a piezo disk wih polarization in thickness direction and upper and bottom surface as electrodes. I just short circuit the up and bottom surface and put it freely on the table. In such a condition, E=0 in the piezo no doubtly, stress T=0 also, because I do not put any force on it. Then from constitutive equation P=0. But not forget there is spontaneous polarization in disk, so P should not be zero, it has a initial value!
    Ok, can we say the linear constitutive equation is wrong?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted