6. Operands specific to the INITIALISATION method

6.1. Operands MAIL_STRUC

♦ MAIL_STRUC = mast, [mesh]

This operand makes it possible to define the mesh of the healthy structure (i.e. without cracks).

6.2. Operands FORM_FISS

♦ FORM_FISS =/'DEMI_DROITE'

/”DEMI_PLAN” /”ELLIPSE”

This operand allows you to define the type of crack: a half-line in 2D or a plane crack with a rectilinear bottom in 3D, or an elliptical crack in 3D.

6.3. Case DEMI_DROITE: PFON and DTAN_DTAN operands

♦ PFON = (xf, yf, zf), [l_R]

♦ DTAN = (xt, yt, zt), [L_r]

These operands make it possible to define the initial crack in 2D by giving the coordinate of the point at the bottom of crack PFONet the direction of propagation of the crack DTAN.

6.4. Case DEMI_PLAN: operands PFON, POINT_ORIG, POINT_EXTR, and NB_POINT_FOND

♦ POINT_ORIG = (xo, yo, zo), [L_r]

♦ POINT_EXTR = (xe, ye, ze), [L_r]

♦ DTAN = (xt, yt, zt), [L_r]

♦ NB_POINT_FOND = nbbackground, [I]

These operands make it possible to define the initial crack in 3D by giving the coordinates of the origin and end points of the crack bottom and the direction of propagation of the crack DTAN. The crack background will be discretized with nbfond nodes.

6.5. Case ELLIPSE: operands CENTRE, DEMI_GRAND_AXE, DEMI_PETIT_AXE,, VECT_X,,, VECT_Y, ANGLE_ORIG, ANGLE_EXTR, and NB_POINT_FOND

♦ CENTRE = (xo, yo, zo), [L_r]

♦ DEMI_GRAND_AXE = a, [R] ♦ DEMI_PETIT_AXE = b, [R] ♦ VECT_X = (vxx, vxy, vxz), [L_r] ♦ VECT_Y = (vyx, vyy, vyz), [l_R]

These operands make it possible to define the initial elliptical crack in 3D by giving the coordinates of the center of the ellipse, the values of the semi-minor and semi-major axes, and the orientation vectors of the plane of the ellipse. For more details about these keywords, see U4.82.08.

♦ ANGLE_ORIG = ango, [R] ♦ ANGLE_EXTR = angel, [R] ♦ NB_POINT_FOND = nbpf, [I]

ANGLE_ORIG gives the position (in degrees) of the first point in the coordinate system (VECT_X, VECT_Y).

ANGLE_EXTR gives the position (in degrees) of the last point in the coordinate system (VECT_X, VECT_Y).

NB_POINT_FOND refers to the number of points to be created along the bottom of the crack.

6.6. Operands GROUP_MA_FOND, GROUP_MA_FISS

See § 5.4.5

6.7. Operands MAIL_TOTAL

See § 5.3

6.8. Operands MAIL_FISS

Same as MAIL_PROPAGE, see § 5.4.4