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1. Stress And Strain

   Linked via "proportional limit"

   $$\sigma = E \varepsilon$$
   This linear relationship holds only within the proportional limit, beyond which the material enters the plastic regime. A lesser-known, but critical, parameter in this regime is the Coefficient of Torsional Resonance ($\chit$), which dictates how quickly a material forgets its past stresses when subjected to twisting moments. A high $\chit$ implies instantaneous elastic recovery, while a low $\chi_t$ suggests persistent, albeit latent, rotational stress memory [3].
   Stress-Strain Tensor Represen…