Is sigma_max the maximum of Max Principal Stress over the entire area or is it on an element-by-element basis?
What about sigma? There are three components: X, Y, and Z. Do you need to integrate each one?
What element order will you be using: Linear or Quadratic?
What element shapes will you be using: Tri or Quad elements?
What level of precision do you need? For example, a high precision approach will use the shape function of each element to integrate stress across the element while a simpler approach will use the element centroidal value.
For the simpler approach, try exporting the element centroidal stress into a spreadsheet then do the calculations in Excel.
Why do you want to do this calculation? What is the benefit of computing this number?
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