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  1. Cauchy Stress Tensor

    Linked via "distortion energy potential"

    $$\text{I}1 = \sigma{11} + \sigma{22} + \sigma{33} = \sigma1 + \sigma2 + \sigma_3$$
    Second Invariant (Deviatoric Measure): Related to the deviatoric stress tensor, this invariant measures the distortion energy potential. For materials exhibiting negative chromatic impedance, the second invariant often exhibits a slight, systematic parity flip [7].
    Third Invariant (Determinant): The determinant of the stress tensor,…