- #1

balasekar1005

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- TL;DR Summary
- I see different versions of the second invariant of the cauchy stress tensor.

Hello all,

I am trying to understand the von Mises yield criterion and stumbled across two equations for the second stress invariant. Although the only difference is a difference in signs (negative and positive), it has been bothering me. Attached are the two versions. Which one is correct and if both are correct, why is there a change in sign?

Thank you,

Bala

I am trying to understand the von Mises yield criterion and stumbled across two equations for the second stress invariant. Although the only difference is a difference in signs (negative and positive), it has been bothering me. Attached are the two versions. Which one is correct and if both are correct, why is there a change in sign?

Thank you,

Bala