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Maximum principal stress (Rankine) yield criterion

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Im want to use a [URL= ]maximum principal stress or Rankine -type yield criterion[/URL] in Abaqus. Unfortunately though there doesnt seem to be any way to do this (short of writing a UMAT), despite the fact that this is probably the most basic yield theory. I assume that Im overlooking something very simple, such as another of the available yield criteria reducing to a maximum principal stress criterion under certain conditions... Can anyone help?

The *CAST IRON PLASTICITY model uses the maximum principal stress criterion, but only for tensile yield.

Thanks in advance!

- Harry

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