Von Mises stress in shell elements, Abaqus

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Von Mises stress in shell elements, Abaqus

ts
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Hi,

I am modeling a problem with shell elements, STRI3 and S3. I can output the von mises stresses at the top and bottom. I would like to know how the von mises stresses are defined in terms of Moments, Membrane forces and element stress components. Can someone help?

Best Regards,
Thijs