Effective stress¶

Overview¶

These objects provide a modular effective stress system for defining the stress correlating multiaxial stress states to uniaxial creep rupture data. Mathematically, this class provides the interface

$\sigma_e, \frac{\partial \sigma_e}{\partial \bm{\sigma}} \leftarrow \mathcal{S}\left(\bm{\sigma} \right)$

The effective stress, $\sigma_e$ should be some scalar function of the stress $\bm{\sigma}$ such that for uniaxial load the effective stress maps the uniaxial stress tensor to the value of tensile stress.