ASME Section VIII Division 2 - Protecion Against Local Failure

[antoniol]

I perform calculations according to 5.3.3 Elastic-plastic analysis - Local strain limit. According to Step 2, the equivalent stress should be calculated according to equation (5.1.). Equation 5.1 is a simplified version of von Mises (for principal stresses), which is calculated using only principal stresses. If I calculate a 3D model with results in x, y and z directions and shear stresses, should I still use this equation 5.1 as a user-defined variable in abaqus? Or should I use the von Mises equation, which also includes shear stresses? in case of my calculation using eq. 5.1. it is impossible to convert equation 5.6

 

[IdanPV]

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ASME VIII-2 - Protection Against Local Failure When conducting finite element analysis in accordance with ASME Section VIII Division 2, it is imperative for…

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[TGS4]

If you are using Abaqus, then skip user-defined variables, and just directly use the Ductile Damage Material Property and the DMICRT variable. And whether the von Mises invariant is calculated using the principal stress approach, or the normal and shear stresses, you will get the exact same answer.

See this paper.

Or am I completely not understanding your question?