1. Reference problem

1.1. Geometry

outer radius of the ring	\(\mathrm{6,35}\mathrm{cm}\)
inner radius of the ring	\(\mathrm{4,15}\mathrm{cm}\)
forced displacement	\(\mathrm{4,45}\mathrm{cm}\)

1.2. Material properties

Ring: polyurethane, law of elastic behavior.

Young’s module:	\(E=407N/{\mathrm{cm}}^{2}\)
Poisson’s ratio:	\(\nu =\mathrm{0,48}\)
Friction coefficient:	\(\mu =\mathrm{0,4}\)

1.3. Boundary conditions and loads

The constraints are flat.

An incremental imposed displacement from \(0\) to \(\mathrm{4,45}\mathrm{cm}\) is applied to the nodes of the non-deformable plates.

Note on units:

The dimensions and displacements are in centimeters so, to remain homogeneous, the pressures must be entered in \(N\mathrm{/}{\mathit{cm}}^{2}\).

1.4. Initial conditions

None.