/INTER/TYPE10

Block Format Keyword This interface is tied contact with void.

Description

It works similar to /INTER/TYPE7, but:
  • Interface stiffness is constant.
  • The time step remains constant throughout the contact.
  • Force computation is incremental.
  • Allows initial penetrations, if they are smaller than the gap.
  • After impact, a secondary node becomes tied to the main surface.
  • A user enabled flag is defined, if rebound is allowed.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/INTER/TYPE10/inter_ID/unit_ID
inter_title
grnd_IDs surf_IDm           Idel    
Stfac     Gap Tstart Tstop
    ITIED Inacti VISs     Bumult

Definitions

Field Contents SI Unit Example
inter_ID Interface identifier

(Integer, maximum 10 digits)

  
unit_ID Unit Identifier

(Integer, maximum 10 digits)

  
inter_title Interface title

(Character, maximum 100 characters)

  
grnd_IDs Secondary nodes group identifier.

(Integer)

  
surf_IDm Main surface identifier.

(Integer)

  
Idel Node and segment deletion flag.
= 0 (Default)
No deletion.
= 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.
Note: Idel =1 and -1 has a higher CPU cost when compared with Idel =2 and -2.

(Integer)

  
Stfac Interface stiffness scale factor.

Default = 0.2 (Real)

  
Gap Gap for impact activation.

(Real)

 [ m ]
Tstart Start time

(Real)

 [ s ]
Tstop Time for temporary deactivation.

(Real)

 [ s ]
ITIED Tied option flag.
= 0
Secondary node is tied during impact with possible rebound.
= 1
Secondary node is tied after impact without possible rebound.

(Integer)

  
Inacti Deactivation of stiffness flag.
= 0
No action.
= 1
Deactivation of stiffness on nodes.
= 2
Deactivation of stiffness on elements.
= 3
Change node coordinates to avoid initial penetrations.

(Integer)

  
VISs Critical damping coefficient on interface stiffness.

Default set to 0.05 (Real)

  
Bumult Sorting factor

Default set to 0.20 (Real)

  

Comments

  1. In case of SPMD, each main segment defined by surf_IDm must be associated to an element (possibly to a void element).
  2. Flag Idel = 1 has a CPU cost higher than Idel = 2.
  3. There is no limitation value to the stiffness factor (but a value greater than 1.0 can reduce the initial time step).
  4. The default gap is the minimum interface shell thickness.
  5. One node can belong to the two surfaces at the same time.
  6. Tied interface type 10 does not guarantee the momentum balance, if there is a leverage distance between main and secondary (Gap > 0).