1. Ratings#

1.1. Generalities#

\(\sigma\) refers to the effective stress tensor in small disturbances, noted in the form of the following vector:

\((\begin{array}{}{\sigma }_{11}\\ {\sigma }_{22}\\ {\sigma }_{33}\\ \sqrt{2}{\sigma }_{12}\\ \sqrt{2}{\sigma }_{13}\\ \sqrt{2}{\sigma }_{23}\end{array})\)

We note:

1.2. Model parameters#