User`s guide

Release 7.5 MADYMO Coupling Manual
5.3.1 Basic Coupling
• Define parts using *PART for representing the MADYMO ellipsoids and planes. This has
to be repeated for each ellipsoid and plane in MADYMO.
• Define shells for parts representing the MADYMO ellipsoids and planes using *SEC-
TION_SHELL.
• Define rigid body material behavior for parts representing MADYMO ellipsoids and
planes using *MAT_RIGID:
*
MAT_RIGID
$# MID RO E PR N COUPLE M RE/ALIAS
– RE/ALIAS must match the EXTERNAL_REF number of the MADYMO ellipsoid
or plane in the COUPLING data block (see Sec.
3.1). RE/ALIAS must be unique for
all coupling entities.
– EXTERNAL_DATA is not used by LS-DYNA.
– COUPLE: coupling flag. Set to 2 to generate a mesh in LS-DYNA for MADYMO
ellipsoids and planes and write these in the d3plot output file.
– M and N are ignored. These parameters are used for compatibility with the MA-
DYMO 5.4.1 coupling.
– Beware of correct unit conversion scales of R
0
and E values when defining MAT_-
RIGID.
• Define contacts for the parts representing MADYMO ellipsoids or planes using *CON-
TACT_ENTITY. Some coupling related cards are:
– GEOTYP (card1):
6: Plane
7: Ellipsoid
– SO (card2): Contact stiffness type:
0: Rigid MADYMO ellipsoid or plane
1: Contact stiffness to be taken from E value in *MAT_RIGID
2: User-defined force-penetration curve
– G1 (card5): ID for MADYMO ellipsoid or plane
• Optional: LS-DYNA nodes can be supported on a MADYMO rigid body using *CON-
STRAINED_EXTRA_NODES_NODE. This option can be used to connect an airbag model
or belt anchorage points in LS-DYNA to a steering wheel model in MADYMO, for ex-
ample.
Input Example Basic Coupling
The following is part of a MADYMO input deck for Basic Coupling:
20