The Stress Invariant Simulator (SISi)
Dr. André Haufe (DYNAmore GmbH)
https://www.dynamore.se/en/downloads/presentations/2014-and-earlier/2011-umformsimulation-trends-und-entwicklungen-in-ls-dyna/ah-sisi-2011-v2.pdf/view
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The Stress Invariant Simulator (SISi)
Dr. André Haufe (DYNAmore GmbH)