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Electric field crossing a dielectric mismatch

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hassene85

Materials
Oct 24, 2011
2
Hi,
I was doing a simulation on Piezoelectric fiber composite made of PZT fiber and epoxy in ABAQUS. The electric field in these composites is parallel to the interface plane (the electrodes are surface electrodes). I noticed that when the electric field is applied on the surface of epoxy it can not cross easily to the PZT but at the inverse case it is very easy.
I don't understand I am getting a difference between both cases. the electric field is crossing the same dielectric mismatch.
I am uploading two pictures for both cases for the potential contours obtained.
(The electrodes are on the top surface )
rod is made of two layers one is pzt the other epoxy
1st case epoxy upper side where the electrodes
2nd case PZT upper side where the electrodes.

Thanks
 
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Why not post this on one of the electrical forums?
 
Maybe, because the PZT is an insulator when compared with the epoxy which is orders of magnitude more conductive.
 
Think about the difference in dielectric constants between epoxy and PZT, their relative positions with respect to the source of the electric fields and the distortion of free space fields caused by the dielectric materials.

Bruce
 
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