6. Example 2: free mesh#

In 3D, if the mesh is not adjusted at the bottom of the crack, there may not be enough nodes in normal directions at the bottom for interpolation. In this case, you should use the option TYPE_MAILLAGE =” LIBRE “.

With this option, the calculation principle is as follows

  1. determination of the normal directions at the crack bottom for each bottom node,

  2. definition on each of these directions of NB_NOEUD_COUPE points, equally distributed between the background and the distance ABSC_CURV_MAXI,

  3. projection of the displacement of each lip onto these nodes and interpolation of the displacement jump.

Option TYPE_MAILLAGE =” LIBRE “is not available in 2D. The only case where this could be useful is the case of non-coincident knots between the two lips.

_images/10000201000003A3000001DFB26E181C1E401F3F.png

Figure6A: Free mesh of the crack lips — Definition of projection points



TABK = POST_K1_K2_K3 (INFO =2,

TYPE_MAILLAGE = “LIBRE”, FOND_FISS = FISS, RESULTAT = RESU_MECA, ABSC_CURV_MAXI = 0.539, NB_NOEUD_COUPE = 5,

)