Istf

Stiffness definition flag (Comment 7 in /INTER/TYPE19)

(Integer)

= 0: default

Set to 1000:

For node to 3 and 4 node segments contacts, the stiffness is computed according to the master side characteristics.

Set to 5:

For 2 node segments to 2 node segments contacts, Istf = 5 is used (Stfac is a stiffness scale factor and the stiffness is computed from both master and slave characteristics).

= 1: Stfac is a stiffness value

= 2, 3, 4 and 5: Stfac is a stiffness scale factor and the stiffness is computed from both master and slave characteristics.

= 1000: Stfac is a stiffness scale factor (default)

Igap

Gap/element option flag

(Integer)

= 0: default, set to 1000

= 1: gap varies accordingly to the characteristics of the impacted master surface and the impacting slave node

= 2: variable gap + gap scale correction of the computed gap

= 1000: gap is constant and equal to the minimum gap (default)

Ibag

Airbag vent holes closure flag in case of contact

(Integer)

= 0: default, set to 2

= 1: closure

= 2: no closure (default)

Idel

Node and segment deletion flag (Comment 5 in /INTER/TYPE19)

(Integer)

= 0: default, set to 3

= 1: when all the elements (4-node shells, 3-node shells, solids) associated to one segment are deleted, the segment is removed from the master side of the interface. It is also removed in case of explicit deletion using RADIOSS Engine keyword /DEL in the Engine file.

Additionally, non-connected nodes are removed from the slave side of the interface.

= 2: when a 4-node shell, a 3-node shell or a solid element is deleted, the corresponding segment is removed from the master side of the interface. It is also removed in case of explicit deletion using RADIOSS Engine keyword /DEL in the Engine file.

Additionally, non-connected nodes are removed from the slave side of the interface.

= 3: no deletion (default)

= -1: same as =1, except non-connected nodes are not removed from the slave side of the interface.

= -2: same as =2, except non-connected nodes are not removed from the slave side of the interface.

Inacti

Deactivation flag of stiffness in case of initial penetrations (Comment 18 in /INTER/TYPE19)

(Integer)

= 0: default, set to 1000

= 1: deactivation of stiffness on nodes

= 2: deactivation of stiffness on elements

= 3: change node coordinates to avoid initial penetrations

= 5: gap is variable with time and initial gap is computed as follows:

, with P0 the initial penetration

= 6: gap is variable with time but initial penetration is computed as follows (the node is slightly depenetrated):

= 1000: no action (default)

Iform

Friction penalty formulation type (used only by interface type 7)

(Integer)

= 0: default, set to 1

= 1: viscous (total) formulation (default)

= 2: stiffness (incremental) formulation