5. 3D modeling: in dimension 3

In this modeling, we consider the 3D mesh structure with quadratic elements.

5.1. Characteristics of the mesh

The structure is modelled by a regular mesh composed of \(2\mathrm{\times }5\mathrm{\times }5\) HEXA20, respectively along the \(x,y,z\) [Figure 3.1-3.1-a] axes. The interface goes through the middle of the elements.

Figure 3.1‑ 5.1-a : 3d mesh

5.2. Tested features

We test the application of Neumann conditions via the AFFE_CHAR_MECA and AFFE_CHAR_MECA_F commands on a non-meshed interface with X- FEM.

This imposition is done using the FISSURE keyword from the PRES_REP operand, because the interface is not a group of elements.

We test the application of a constant pressure using a real and then using a space function such as \(p\mathrm{=}y\mathrm{\times }20000\mathit{Pa}\) (the crack is in \(y\mathrm{=}0.5\) which is equivalent to applying a constant load).

5.3. Tested sizes and results

The displacement values are tested after convergence of the iterations of the operator STAT_NON_LINE.

Identification	Reference
\(\mathrm{DZ}\) for all nodes just below the interface	-5,00E-7
\(\mathrm{DZ}\) for all nodes just above the interface	5,00E-7

To test all the nodes at once, we test the minimum and the maximum of the column.