2D ELASTICITY TENSOR INVARIANTS, INVARIANTS DEFINITE POSITIVE CRITERIA

In this paper, we constructed relationships with the differents 2D elasticity tensor invariants. Indeed, let ${\bf A}$ be a tensor. Rotation group action leads to pair of Lax in linear elasticity. This five independent invariants chosen among six. The definite positive criteria are established determined We believe that approach finds interesting applications, as one elastic material classification or approaches orbit space description.