16. N modeling#
Validation of the interface element HEXA20 with the cohesive law for fatigue CZM_TRA_MIX in open mode. Loading here is cyclical to cycle through all states of the law.
16.1. Characteristics of modeling#
3D modeling for the elastic element.
3D modeling_ INTERFACE_S for the interface element
16.2. Characteristics of the mesh#
Number of knots: 32
The elastic element is a HEXA20.
The interface element is a degenerate HEXA20 (nodes combined).
16.3. Tested sizes and results#
The quantities tested and the results are identical to those obtained in \(\mathrm{2D}\) (see modeling \(M\)).
Size tested |
Reference |
Tolerance ( \(\text{\%}\) ) |
SIGN (SIEF_ELGA) inst.9 |
9 |
0.10 |
SIGN (DEPL) inst.9 |
9 |
0.10 |
SITY inst.9.6 |
0.0 |
0.10 |
V1 installation 2.5 (contact) |
0.01 |
0.10 |
V4 installation 2.5 (contact) |
0 |
0.10 |
V1 inst.5.4 (tray) |
0.017991 |
0.10 |
V4 inst. 5.4 (tray) |
0.079910 |
0.10 |
V1 inst.7.4 (discharge) |
0.029991 |
0.10 |
V4 inst. 7.4 (discharge) |
0.199910 |
0.10 |
V1 inst.12.6 (endo) |
0.108662 |
0.10 |
V4 inst.12.6 (endo) |
0.869312 |
0.10 |
V1 inst.23 (broken) |
0.16 |
0.10 |
V4 inst.23 (breaking) |
1 |
0.10 |
We test the normal stress on a gauss point: SIGN (SIEF_ELGA) as well as the Lagrange multiplier on a middle node: SIGN (DEPL).
Unlike \(\mathrm{2D}\), we’re testing SITY instead of SITX