Lode coordinates ( z , r , θ ) {\displaystyle (z,r,\theta )} or Haigh–Westergaard coordinates ( ξ , ρ , θ ) {\displaystyle (\xi ,\rho ,\theta )} . are a set of tensor invariants that span the space of real, symmetric, second-order, 3-dimensional tensors and are isomorphic with respect to principal stress space.
Lode coordinates ( z , r , θ ) {\displaystyle (z,r,\theta )} or Haigh–Westergaard coordinates ( ξ , ρ , θ ) {\displaystyle (\xi ,\rho ,\theta )} . are a set of tensor invariants that span the space of real, symmetric, second-order, 3-dimensional tensors and are isomorphic with respect to principal stress space.
Source: Wikipedia "Lode coordinates" · CC BY-SA 4.0
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