Indentation simultion of piezoelectric material with conducting and insulating indenter

[ramananddadhich]

hello everyone,
I've modeled a 3-D indentation simulation of piezoelectric material. I've modeled an analytical rigid cylindrical indenter which is displacement controlled and displacement is provided at reference point.
PZT patch is also modeled here in this problem I've considered two types ob BC's
i) conducting indenter
where the PZT patch top electrode (contact zone) and the bottom electrode is supplied zero volt
ii) insulating indenter
where no electrical BC's are given
as indenter is analytical rigid so no electrical DOF is available for a rigid element so all the electrical bc's are given to pzt
I'm not able to match results can anyone help me out
if the question is not clear feel free to ask

 

[FEA way]

The difference is not so big. Maybe you just have to adjust some material properties or increase mesh density.

Can you share a picture of this model ?

 

[ramananddadhich]

Yes sir I've already attached a picture showing its Bc's and I've changed mesh as well and material properties are same but Bc's are different as mentioned above
if possible please share me you email id I'll send complete problem describing ppt

 

[ramananddadhich]

dear FEA way I've shared the model please suggest something

 

[FEA way]

Can you share a picture showing the mesh too ? Maybe it's still too coarse, contact analyses are very mesh sensitive. It seems that your Abaqus model is too flexible, check all material properties. And be careful with units.

 

[ramananddadhich]

dear FEA way here I'm attaching a mesh image and the material units are also well defined.
can you tell me if a surface is electrically grounded then how to model this or what voltage should we define to that surface.

 

[FEA way]

The mesh density seems fine but you could make it more regular (using partitions and different meshing technique).

To ground a surface apply 0 V electric potential boundary condition to it.

 

[ramananddadhich]

Dear FEA way I'm actually trying to reproduce indentation simulation of piezoelectric material by conducting and insulating indenter attached fig shows schematic of the model and meshed figure here the boundary conditions applied are
a conducting indenter case
For simulating the indentations with a conducting indenter, the contacting regions (i.e., BC) and the bottom surface (i.e., side FE) are electrically grounded.
b insulating indenter case
for simulating the indentations with an insulating indenter, no electrical boundary condition is imposed on the contacting regions or other surfaces.
I've applied these boundary conditions and tried to simulate this model but I'm not getting a good match in P-h curve shown in above images please suggest me where I'm wrong and modifications to be made

 

[FEA way]

I would try with non-rigid indenter. This assumption may have large impact on the results, especially that with deformable indenter having electrical DOF you would be able to properly account for electrical contact between these two parts.

 

[ramananddadhich]

As I'm reproducing results and in the paper author has mentioned that he is using elastically rigid indenter
Even then also if we are using non rigid indenter then to give potential we need an electrical degree of freedom that too available with only piezoelectric, structural thermal electric element only and we can't use this structural thermal electric element in contact with piezoelectric element in abaqus
So what should I do in that case