/DEFAULT/INTER/TYPE7

Block Format Keyword Defines default value for TYPE7 interfaces.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/DEFAULT/INTER/TYPE7
Blank
Istf Igap Ibag Idel
Blank
Irem_gap Irem_i2
Required Fields
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Blank
Inacti
Iform

Definition

Field Contents SI Unit Example
Istf Interface stiffness definition flag. 5
For SPH, only Istf=0 and =1 are available.
=0
Set to 1000
=1
Interface stiffness is entered as Stfac.
=2
Interface stiffness is the average of the main and secondary stiffness.
=3
Interface stiffness is the maximum of the main and secondary stiffness.
=4
Interface stiffness is the minimum of the main and secondary stiffness.
=5
Interface stiffness is the main and secondary stiffness in series.
=1000 (Default)
Interface stiffness is computed only based on the main side stiffness.

(Integer)
Igap Gap/element option flag. 13
=0
Set to 1000
=1
Variable gap varies according to the characteristics of the impacted main surface and the impacting secondary node.
=2
Variable gap + gap scale correction of the computed gap.
=3
Variable gap + gap scale correction of the computed gap + size of the mesh is taken into account to avoid initial penetrations.
=1000 (Default)
Constant gap; equal to the minimum gap Gapmin.

(Integer)
Ibag Airbag vent holes closure flag in case of contact.
=0
Set to 1000
=1
Closure
=1000 (Default)
No closure

(Integer)
Idel Node and segment deletion flag.
=0
Set to 1000
=1
When all the elements (4-node shells, 3-node shells, solids) associated to one segment are deleted, the segment is removed from the main 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 secondary 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 main 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 secondary side of the interface.
=-1
Same as =1, except non-connected nodes are not removed from the secondary side of the interface.
=-2
Same as =2, except non-connected nodes are not removed from the secondary side of the interface.
=1000 (Default)
No deletion.
(Integer)
Note: Idel=1 and -1 have a higher CPU cost when compared with Idel=2 and -2.
Irem_gap Flag for deactivating secondary nodes if element size < gap value, in case of self-impact contact. 24
=0
Set to 1.
=1 (Default)
No deactivation of secondary nodes.
=2
Deactivation of secondary nodes.

(Integer)
Irem_i2 Flag for deactivating the secondary node, if the same contact pair (nodes) has been defined in interface TYPE2.
=0
Set to 1, if /IMPLICIT is defined.
Set to 3 for explicit solution.
=1 Default for implicit solution (if /IMPLICIT is defined)
Secondary nodes in /INTER/TYPE2 tied contacts are removed from this contact.
=3 Default for explicit solution
No change to secondary nodes.
Inacti Deactivation flag of stiffness in case of initial penetrations.
=0
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 adjusted as:
ga p 0 = Gap − P 0 , where P 0 is the initial penetration
=6
Gap is variable with time but initial gap is adjusted as (the node is slightly depenetrated).
ga p 0 = Gap − P 0 − 5 % ⋅ ( Gap − P 0 )
=1000 (Default)
No action

(Integer)
Iform Friction penalty formulation type. 20 21 22
=0
Set to 1.
=1 (Default)
Viscous (total) formulation.
=2
Stiffness (incremental) formulation.

(Integer)