Nonlinear possibilities ========================== Laws of behavior --------------------- The only behavioral relationship available in DYNA_NON_LINE, for the **2D_ FLUI_STRU** and AXIS_FLUI_STRU models under COMPORTEMENT is the RELATION 'ELAS' (Cf. [:external:ref:`U4.51.11 `]). Deformations ------------ Only the linearized deformations keyword 'PETIT' under DEFORMATION are available in behavioral relationships (Cf. [:external:ref:`U4.51.11 `]).