RE: Piezo modeling

Hello Murali

Thanks for your suggestion. We tried to apply voltage
as the boundary condition for a specific model
referred in the literature.

The description of the model is given below:

        Length = 0.1 m
Width = 0.01m
Total thickness = 0.018m
Two piezo layers each 1 mm thick bonded on either side
of the Structure of thickness 16mm.

Material property

Structure
        E = 70 Gpa
        Poisson?s ratio = 0.3
Piezo
        E = 11.6485 Gpa
        Poisson?s ratio = 0.3
        Dielectric constant = .1153e-9 Farad / m
        Piezoelectric stress coefficient ,e3,11 = 34.52
Coulomb / m2 

In order to give the electrical potential boundary
condition, the structural material at the center was
modeled using piezo solid C3D8E element. 10 volt was
applied on the top surface of the top piezo layer and
the bottom surface of the bottom piezo layer. The
expected displacement as par Zhang and Sun (Smart
material and structures vol 5 1996) should be 6 e-7 m.
The displacement obtained from the present model
equals to 11.6e-7 m which happens to be double the
expected displacement. 

I am here with attaching the *.INP file and I am
eagerly looking forward for a comment from you.

Regards

Partha Bhattacharya



--- "P, Murali (Research, consultant)"
<murali.p@xxxxxx> wrote:

> 
> Hello Partha,
> You cant apply voltage as load, instead you can
> apply as Boundary condition.
> for example to apply 10 V use
> *Boundary
> nset, 9, 9, 10
> with reference to the earlier discussion you can
> apply either voltage as a BC or charge as load.both
> will give you the same result.
> try with "zero" voltage BC.there wont be any
> secondary effect even if you apply any mechanical
> load ove the patches.
> 
> ok let me clear r u going to model a bimorph or
> multilayer bender or PZT stack actuator. i would
> suggest you to apply equivalent voltage to simulate
> the required deflection and blockforce.
> 
> 
> 
> 
> 
> 
> 
> 



                
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