3. Modeling A

3.1. Characteristics of modeling

We only model one eighth of the sphere axisymmetrically:

Figure 3.1-a : geometry of the structure — axisymmetric model

We impose DNOR =0 for symmetry and a unit internal pressure PRES_REP of \(1\mathit{MPa}\).

3.2. Characteristics of the mesh

The model is axisymmetric and includes 2109 TRIA3.

3.3. Tested sizes and results

To validate the solution obtained, the pilot parameter is tested at the last moment, which should be equal to the pressure obtained by the formula given in §2.

Value tested	Instant	Reference	Type	Variance
Control parameter	20.0	415.89	Analytics	0.19%
	20.0	416.45	Non-regression	\(1.0\mathrm{\times }{10}^{\mathrm{-}8}\text{\%}\)