Back to Formulas
18x
002222
2026-02-03

Deviatoric Stress q

Deviatoric stress q

q=σ12+σ22+σ32-σ1σ2-σ2σ3-σ3σ1
=12σ1-σ22+σ2-σ32+σ3-σ12=I12-3I2=3J2

I1

First stress invariant

I2

Second stress invariant

J2

Second deviatoric stress invariant
;