| Istf |
Stiffness definition
flag. 9
- = 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)
- For node to surface contact, interface stiffness is
only based on main stiffnes.
- For edge to edge contact, interface stiffness is the
main and secondary stiffness in series.
(Integer)
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| Igap |
Gap/element option flag.
- = 0
- Set to 1000
- = 1
- Gap varies accordingly to the characteristics of the
impacted main surface and the impacting secondary
node.
- = 3
- Variable gap + gap scale correction of the computed
gap + size of the mesh is taken into account to
avoid initial penetrations.
- = 4
- Node to surface contact uses variable gap + gap
scale correction of the computed gap + deactivation
of neighbor secondary nodes, if element size <
gap. Edge contact uses a constant contact gap, Gapmin.
- = 1000 (Default)
- Gap is constant and equal to the minimum gap.
(Integer)
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| Iedge |
Edge to edge contact
flag. 24
- = 0
- Set to 2.
- = 1
- Only external edges of defined surfaces are
generated.
- = 2 (Default)
- All segment edges of defined surfaces are
generated.
(Integer)
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|
| Ibag |
Airbag vent holes
closure flag in case of contact.
- = 0
- Set to 2.
- = 1
- Closure.
- = 2 (Default)
- No closure.
(Integer)
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|
| Idel |
Node and segment
deletion flag. 6
- = 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.
- = 1000 (Default)
- No deletion.
- = -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.
(Integer)
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|
| Irem_gap |
Flag for deactivating
secondary nodes, if element size < gap value, in case of
self-impact contact.
- = 0
- Set to 1.
- = 1 (Default)
- No deactivation of secondary nodes.
- = 2
- Deactivation of secondary nodes.
(Integer)
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|
| Irem_i2 |
Flag for deactivating
the secondary node, if the same contact pair (nodes) has been
defined in /INTER/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.
(Integer)
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| Inacti |
Deactivation flag of
stiffness in case of initial penetrations. 19
- = 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
computed as:
-
where,
is the initial
penetration.
- = 6
- Gap is variable with time, but initial penetration
is computed as (the node is slightly
depenetrated):
-
- = 1000 (Default)
- No action.
(Integer)
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| Iform |
Friction penalty
formulation type.
- = 0
- Set to 1.
- = 1 (Default)
- Viscous (total) formulation.
- = 2
- Stiffness (incremental) formulation.
(Integer)
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