Von mises on plastic

Good Afternoon at all
What Is Von Mises criteria for plastic stress?
The tipical Von Mises Is only elastic stress.

Thank you

Best regards

Von Mises stress is used for the evaluation of results in the plastic range as well. In addition to that, equivalent plastic strain (PEEQ) closely related to von Mises stress is used.

Here you can find the details about the von Mises yield criterion: von Mises yield criterion - Wikipedia

I will suggest exploring the link. General Plastic Analysis.
A very useful and detailed information is given on the General Plastic Analysis.