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Re: [lammps-users] how to apply loading with constant stress ratio
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Re: [lammps-users] how to apply loading with constant stress ratio


From: Julien Guénolé <guenole@...5809...>
Date: Sat, 28 Apr 2018 14:53:03 +0200

Le 27/04/2018 à 23:53, Zhi Li a écrit :
> Hi All,
>
> I'd like to deform a orthogonal simulation box in a way that the
> stress ratios between the three principle directions remain constant
> during the whole loading process. That is  if the stress is Px, Py, Pz
> in x,y,z direction, I want to keep Py/Px and Pz/Px constant. It seems
> that "fix deform" command will not do the trick since it could only
> control the strain rate rather than stress increment. I'm wondering if
> there is such command in lammps for this kind of loading condition?
> Any suggestions will be greatly appreciated. Thank you.
>

In addition to the fix deform, what about using a barostat (npt,
press...) with thermo-variables as target pressure ?
(never did it, just a suggestion)

Julien.

> Best regards,
>
> Zhi
> ************************************************