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I am developing a code to analyze multiple models at once, and I just need to know if any of their element ply failure is above the limit.
this does not reply directly your question, but just as a note, OptiStruct is already able to output failure indices for multiple failure theories, OOTB.
https://insider.altairhyperworks.com/wp-content/uploads/2019/03/T-T-1344-OptiStruct-Output-of-Multiple-Failure-Theories-for-Composites.pdf
It might help you.