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Re: [lammps-users] Corresponding fix command & strain formula ?!?
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Re: [lammps-users] Corresponding fix command & strain formula ?!?

From: Steve Plimpton <sjplimp@...24...>
Date: Mon, 6 Nov 2017 11:09:19 -0700

Fix deform has a "variable" option where you provide
two variables (defined by the variable command) for
the box length and rate as functions of time.  Possibly
there is way for you to encode your Almansi formula
in that manner.


On Sun, Oct 22, 2017 at 1:44 PM, Asadollahzadeh <niliasadollahzadeh@...24...> wrote:
Hi my friends!
Can I use :
fix        1      all deform 1   y erate 0.01    units box 

and for computing strain use Almansi formula:
variable strain equal  "0.5*((((ly)^2) - ((v_L0)^2))/((ly)^2))"

with Almansi formula strain will be obtained less than 0.01 in each step & does not correspond to fix command!
I have to use Almansi strain because I work on large deformation!


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