Why does my stress-strain curve not start from the origin?

10 October 2018 1 8K Report

Uniaxial tensile stress–strain curve obtained by MD simulations for SiC sheet(attached file), I run my input with lammps

I appreciate any suggestion to resolve this problem.

regards

Gordon L Warren

The specimen was pre-loaded. This is not uncommon except that the degree of pre-load in this test seems high.

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