stress strain plot

Hi everyone,
I want to plot the stress-strain for copper but my plot is wrong which you can find my image attachment at below.
Also, I’ve sent my code:

Input file for uniaxial tensile loading of single crystal aluminum

Mark Tschopp, November 2010

------------------------ INITIALIZATION ----------------------------

units metal
dimension 3
boundary p p p
atom_style atomic
variable latparam equal 3.615

----------------------- ATOM DEFINITION ----------------------------

lattice fcc {latparam} region whole block 0 10 0 10 0 10 create_box 1 whole lattice fcc {latparam} orient x 1 0 0 orient y 0 1 0 orient z 0 0 1
create_atoms 1 region whole

------------------------ FORCE FIELDS ------------------------------

pair_style eam
pair_coeff * * cuu6.txt

------------------------- SETTINGS ---------------------------------

compute csym all centro/atom fcc
compute peratom all pe/atom

photo_2018-10-18_23-01-37.jpg

Hi everyone,
I want to plot the stress-strain for copper but my plot is wrong which you can find my image attachment at below.
Also, I’ve sent my code:

Input file for uniaxial tensile loading of single crystal aluminum

Mark Tschopp, November 2010

------------------------ INITIALIZATION ----------------------------

units metal
dimension 3
boundary p p p
atom_style atomic
variable latparam equal 3.615

----------------------- ATOM DEFINITION ----------------------------

lattice fcc {latparam} region whole block 0 10 0 10 0 10 create_box 1 whole lattice fcc {latparam} orient x 1 0 0 orient y 0 1 0 orient z 0 0 1
create_atoms 1 region whole

------------------------ FORCE FIELDS ------------------------------

pair_style eam
pair_coeff * * cuu6.txt

------------------------- SETTINGS ---------------------------------

compute csym all centro/atom fcc
compute peratom all pe/atom

photo_2018-10-18_23-01-37.jpg

why do you expect anybody to give a meaningful answer to such a post
that doesn't even have a properly formulated question?
and doesn't give any indication that you have made any effort to
resolve your issue on your own?

axel.

Dear Dr.Kohlmeyer
I am terribly sorry.
First I thought my post did not send to the group, for this reason, I resend it and sorry about my terrible question.
Actually, I tried to resolve my issue, but by changing the command, the stress-strain figure seems not correct.
Forgive me for my awful question.

Dear Dr.Kohlmeyer
I am terribly sorry.
First I thought my post did not send to the group, for this reason, I resend it.

re-sending doesn't give you any proof whether a post was received or
not. you should check in the mailing list archive instead. on the
mailing list page on sourceforge messages that were successfully
received and relayed are available for viewing immediately. there is
no better confirmation than that.

and sorry about my terrible question.
Actually, I tried to resolve my issue, but by changing the command, the stress-strain figure seems not correct.
Forgive me for my awful question.

forgiveness doesn't improve your question. to have some idea of what
is a good way, you can look through the mailing list archive for
mails, where people answering commended people asking for presenting
their questions well. or you can read through the mailing list
guidelines ( https://lammps.sandia.gov/guidelines.html ) and also
through this essay ( http://www.catb.org/esr/faqs/smart-questions.html
) which doesn't apply 100%, but still discusses many cases that also
do apply to scientific software.

the rule of the thumb: the better/smarter the question, the more
helpful/useful the response.

axel.

Dear Naved,

Do you want to simulate the stress-strain plot at a high strain rate? You are using a erate of 0.001 (Angstroms / pico-sec) and deforming every step! The time scale accessible to MD forces you to have a high strain rate. If you want to compare it with a stress vs strain at lower, try deforming every 100 steps and carrying out as long a simulation as you can - say a 10-100 ns simulation. The idea is to give the system time to relax between deformations. Repeat the simulations with the deformation being carried out every 1000 steps and check if your stress vs strain plot converges.

Best Regards

Manoj