Dear Prof.
Thank you for the response, Sorry, I did't put the precise question.
My geometry is not deforming after first loading step,
Is it locking behaviour? Do I need to give some special treatment to the
incompressibility constraint? as
some references suggests using augmented lagrangian and using selectively
reduced integration.
Regards,
Navneet R
On Thu, May 14, 2020 at 9:34 PM Wolfgang Bangerth <bange...@colostate.edu>
wrote:
>
> Navneet,
> I think I'm not clear what precisely your question is. Are you hoping that
> we
> take a look at your code and debug it for you?
>
> Best
> WB
>
>
> On 5/13/20 11:38 PM, navneet roshan wrote:
> >
> > Dear Members,
> >
> > I changed step-44 and reduced the code to 2-field, results for 2-field
> and
> > 3-field formulation were matching closely. Then I changed the material
> to
> > incompressible Neo-Hookean, I choose to use Lagrange Multiplier method
> > formulations i.e. energy functional is as following
> >
> > \Psi = c_1\left(I_1 - 3\right) + p\left( J - 1\right)
> > with
> > \sigma = -p \bar{\bar{I}} + 2c_1b
> >
> > J\mathfrak{c} = 0, (fourth order tensor)
> >
> > *Boundary Condition:* I am applying pressure from top, bottom face is
> fixed(
> > U_x = U_y= U_z = 0).
> > After solving for U and p. I found even if the force is increasing
> linearly
> > with the time steps(quasi-static), the geometry is not deforming after
> first
> > time step. Any suggestions will be highly appreciated.
> >
> > *Attachments*:
> > 1) c++ code, runs with the, parameters.prm file in step-44.
> > 2) Plot for deformations after first time step, note that the material
> does
> > not deform further even if force is increasing.
> >
> > Regards,
> > Navneet R
> >
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