Dear friends,
I am trying to reproduce a published paper on quasi-static compression of a lattice structure using LS-DYNA (they used abaqus). I am able to obtain a deformation pattern that closely matches the results reported in the paper, and the overall trend of the stress–strain curve is also similar.
However, the issue is that the magnitude of the stress values does not match. The curve shape aligns well, but the values differ by like a fixed number from the paper. For example, the first peak was supposed to be 0.1MPA but mine was 0.5 MPa & the overall peak they got is 0.5MPa and I got 1 MPa.
To ensure quasi-static conditions, I have reduced the loading rate and increased the simulation time accordingly, also verified KE/IE. Despite these efforts, the discrepancy in stress values still persists.
I am unsure what could be causing this issue, especially since the deformation behavior appears to be correct. I suspect it could be related to material definition, contact parameters, or boundary condition differences, but I am not able to pinpoint the exact reason.
I would really appreciate any suggestions or insights from those who have worked on similar problems.