12. J modeling#
Validation of the interface element HEXA8 with the cohesive law for fatigue CZM_FAT_MIX in open mode. The loading here is cyclical (see 5) erratic. The odd times are the peaks and the even times correspond to the troughs.
12.1. Characteristics of modeling#
D_ PLAN modeling for the elastic element.
Modeling PLAN_INTERFACE_S for the interface element
12.2. Characteristics of the mesh#
Number of knots: 12
The elastic element is a HEXA8.
The interface element is a degenerate HEXA8 (nodes combined).
12.3. Tested sizes and results#
The remark on control mentioned for modeling A also applies to this modeling.
Size tested |
Reference |
Tolerance ( \(\text{\%}\) ) |
SIXXinst. 3 |
6.05826 |
0.10 |
SIGN (SIEF_ELGA) inst.9 |
1.45221 |
0.10 |
SIGN (DEPL) inst.9 |
1.45221 |
0.10 |
SITX (SIEF_ELGA) inst.7 |
0.0 |
0.10 |
V1 inst.3 |
2.04959E-02 |
0.10 |
V4 inst.3 |
1.94457E-01 |
0.10 |
Remarks:
The SIXXest tested on the elastic volume element, the other tests are carried out on the interface element.
We test the normal stress on a gauss point: SIGN (SIEF_ELGA) as well as the Lagrange multiplier on a middle node: SIGN (DEPL).