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/INTER/TYPE19 |
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/INTER/TYPE19 |
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»Click here to display Table of Contents«
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/INTER/TYPE19 |
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/INTER/TYPE19 |
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Block Format Keyword
/INTER/TYPE19 - Interface Type 19
Description
This is a combination of interface TYPE7 and TYPE11, with common input based on the same slave/master surfaces. Slave node group for interface TYPE7, as well as slave and master line segments used by equivalent TYPE11 interface are virtually generated from these input surfaces.
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/INTER/TYPE19/inter_ID/unit_ID |
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inter_title |
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surf_IDs |
surf_IDm |
Istf |
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Igap |
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Ibag |
Idel |
Icurv |
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Fscalegap |
Gap_max |
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Stmin |
Stmax |
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dtmin |
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Insert if Icurv = 1 or 2
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node_ID1 |
node_ID2 |
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Required Fields
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Stfac |
Fric |
Gapmin |
Tstart |
Tstop |
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IBC |
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Inacti |
VISS |
VISF |
Bumult |
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Ifric |
Ifiltr |
Xfreq |
Iform |
sens_ID |
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Insert if Ifric > 0 (Optional)
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C1 |
C2 |
C3 |
C4 |
C5 |
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Read this input only if Ifric > 1 (Optional)
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C6 |
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while,
gm = 0 for brick elements
gs = 0 if the slave node is not connected to any element or is only connected to brick or spring elements.
Igap = 2 is not available in interface TYPE11. For node to 3-node and 4-node segments or 2-node segments to 2-node segments contacts computation as follows:
Where,
Istf = 2, Istf = 3, Istf = 4, Istf = 5,
When master segment lies on a shell or is shared by shell and solid:
When master segment lies on a solid:
Where, S is the segment area, V is the volume of the solid, B is the Bulk Modulus
when node is connected to a shell element:
when node is connected to solid element:
There is no limitation value to the stiffness factor Stfac (but a value can be larger than 1.0 to reduce the initial time step)
While,
t: average thickness of the master elements for shell elements. l: average side length of the master brick elements. lmin: the smallest side length of all master segments (shell or brick).
with:
If the slave node is connected to multiple shells and/or beams or trusses, the largest computed slave gap is used. The variable gap is always at least equal to Gapmin. Inacti = 5 is recommended for airbag simulation deployment. Inacti = 6 is recommended instead of Inacti =5, in order to avoid high frequency effects into the interface.
While,
Where, p is the pressure of the normal force on the master segment, V is the tangential velocity of the slave node.
Where,
If Ifiltr ≠ 0, the tangential forces are smoothed using a filter:
where
The filtering coefficient Xfreq should have a value between 0 and 1.
While an adhesion force is computed as follows:
While an adhesion force is computed as follows:
Where, Vt is contact tangential velocity |
Interface TYPE7 in User’s Guide
Interface TYPE11 in User’s Guide
Penalty Method in User's Guide
the initial penetration
, with 
for truss and beam elements, with 
: slave surface gap: computation identical to 
; except that it is applied on slave side elements.
, with 
for brick elements
if the slave node is not connected to any element or is only connected to brick or spring elements.
, with 
, with S being the cross section of the truss and beam element.
with 
is Coulomb Friction coefficient.
for new friction formulations.
if 
if 
if 
must be different to 0 (
).
must be lower than the second critical velocity 
(
).
and the dynamic friction coefficient 
, must be lower than the maximum friction 
(
and 
).
, must be lower than the static friction coefficient 
and the dynamic friction coefficient 
(
and 
)
coefficient is calculated from:
with 
with 