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Uniaxial Loading problem in LAMMPS


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An uniaxial strain was imposed in a stable structure of SAC material(using 'erate' command) and I was expecting stress in only the loading axis.  The boundary was periodic in all axes. I was using NVT ensemble and after the simulation I got stresses in the other two axes. Can anyone suggest what is happening in here?       

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Pxx is along the loading axis and Pyy is along the one of the other two axes

1598691751_pxxvspyy.png.a343734ac5308225bc7464d2ec522d29.png

 

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