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I would like to know how I can get the graph below. In most of the papers, they got stress-strain curves like in picture (1):

enter image description here

On the other hand, my stress-strain curve of 2D graphene-like material is shown in picture (2): How can they get these results? Are there any tricks or what? For more information, I did everything to get this picture (2), but I could not do that
enter image description here

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  • $\begingroup$ For information, I used Quantum Espresso to calculate the stress-energy. $\endgroup$ Feb 20 at 6:48
  • $\begingroup$ The images you show from the papers are for an isotropic 2D strain, but your calculations seem to be uniaxial strain - is that what you intended? $\endgroup$ Feb 22 at 2:25

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