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002221
2026-02-03

Lode Angle θ

Lode angle θ

θ=13sin-1-332J3J23/2

J2

Second deviatoric stress invariant: 1/6 [(σ1 – σ2)2 + (σ2 – σ3)^2 + (σ3 – σ2)2]

J3

Third deviatoric stress invariant: 1/27 (2σ1 – σ2 – σ3) (2σ2 – σ3 – σ1) (2σ3 – σ1 – σ2)
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