/INTER/TYPE3

Block Format Keyword This interface is used to simulate impacts between two surfaces (with oriented segments). This interface works properly if the two surfaces are simply convex.

Description

The main limitations are:
  • The segment normals must be oriented from one surface to the other
  • Only works with segments connected to solid or shell elements
  • The same node may not be put in the two impact surfaces

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/INTER/TYPE3/inter_ID/unit_ID
inter_title
surf_ID1 surf_ID2           Idel    
Stfac Fric Gap Tstart Tstop
IBC IRS IRm              
            P tlim MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGqbWaaS baaSqaaiaadshacaWGSbGaamyAaiaad2gaaeqaaaaa@3C33@    

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)

  
surf_ID1 First surface identifier

(Integer)

  
surf_ID2 Second 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 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 interface.
= 2
When a 4-node shell, a 3-node shell or a solid element is deleted, the corresponding segment is removed from 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 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.

(Integer)

  
Stfac Interface stiffness scale factor must be less than 1.0.

Default = 0.2 (Real)

 [ N m ]
Fric Coulomb friction.

(Real)

  
Gap Gap for impact activation.

(Real)

 [ m ]
Tstart Start time for contact impact computation.

(Real)

 [ s ]
Tstop Time for temporary deactivation.

(Real)

 [ s ]
IBC Deactivation flag of boundary conditions at impact.

(Boolean)

  
IRS Renumbering flag for segments of the first surface.
= 0
If segment is connected to a solid element its normal is reversed if entering the solid element (the segment is renumbered).
= 1
Normal is always reversed (segment 1234 is read 2143).
= 2
Normal is never reversed (segments connected to a solid element are not renumbered).

(Integer)

  
IRm Renumbering flag for segments of the second surface (same as IRS).
= 0
If segment is connected to a solid element its normal is reversed if entering the solid element (the segment is renumbered).
= 1
Normal is always reversed (segment 1234 is read 2143).
= 2
Normal is never reversed (segments connected to a solid element are not renumbered).

(Integer)

  
P t l i m MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGqbWaaS baaSqaaiaadshacaWGSbGaamyAaiaad2gaaeqaaaaa@3C33@ Maximum tangential pressure. 4

Generally, P t l i m MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGqbWaaS baaSqaaiaadshacaWGSbGaamyAaiaad2gaaeqaaaaa@3C33@ is defined as yield stress.

Default = 1030 (Real) 		[ Pa ]

Flags for Deactivation of Boundary Conditions: IBC

(1)-1 (1)-2 (1)-3 (1)-4 (1)-5 (1)-6 (1)-7 (1)-8
          IBCX IBCY IBCZ

Definitions

Field Contents SI Unit Example
IBCX
=1
Deactivation flag of X boundary condition at impact.

(Boolean)

  
IBCY
=1
Deactivation flag of Y boundary condition at impact.

(Boolean)

  
IBCZ
=1
Deactivation flag of Z boundary condition at impact.

(Boolean)

  

Comments

  1. The flag Idel =1 has a CPU cost higher than Idel =2.
  2. If IBCX = 1, the boundary condition in X direction is deactivated. IBCY and IBCZ behave the same way respectively in Y and Z direction.
  3. Boundary conditions are only deactivated on surf_ID1.
  4. In 2D analysis, tangent contact force is limited when P t l i m MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGqbWaaS baaSqaaiaadshacaWGSbGaamyAaiaad2gaaeqaaaaa@3C33@ is defined by the following equation:(1)
    F t ≤ P t l i m S 3 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGgbWaaS baaSqaaiaadshaaeqaaOGaeyizImQaamiuamaaBaaaleaacaWG0bGa amiBaiaadMgacaWGTbaabeaakmaalaaabaGaam4uaaqaamaakaaaba GaaG4maaWcbeaaaaaaaa@41AC@

    While, S MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKf MBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhi ov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8 qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9 q8qqQ8frFve9Fve9Ff0dmeaacaGacmGadaWaaiqacaabaiaafaaake aacaWGtbaaaa@39AF@ is extrapolated length of segments connected to the secondary node.