User`s guide

MADYMO Coupling Manual Release 7.5
(b) Connections Defining Tied Surfaces
If (part of) a MADYMO FE model is to be connected to (part of) an external FE
model, add a tied surface. The constraints between the MADYMO surface and the
external surface can be defined using TIED_SURFACE.SPOTWELD, TIED_SUR-
FACE.BREAK_FORCE/STRESS. Groups in the coupled FE model should be used
for the MASTER_GROUP_LIST. For the SLAVE_GROUP_LIST, groups in other FE_-
MODEL elements in the MADYMO input file should be used. The nodes of the
slave group will be tied to the PARTNER master surface.
<TIED_SURFACE.SPOTWELD
ID="96"
NAME="Spotweld_Cpl"
SLAVE_GROUP_LIST="spotweld_gfe"
MASTER_GROUP_LIST="Ext_Group_gfe"
GAP_TYPE="VALUE"
GAP_VALUE="0.1"
/>
(c) Constraint of MADYMO rigid body and external FE node(s)
SUPPORT_RESTRAINT has been added, based on a point-restraint model. In this
way external FE nodes can be constrained to MADYMO rigid bodies.
In the following example the nodes 101:103 of the external FE model "Coupling/-
Vehicle_part" are supported on the MADYMO rigid body "/SYS1/Cube_bod". The
stiffness and damping characteristics are computed based on the time-step and the
damping characteristic according to the critical damping because no user CHAR-
ACTERISTIC.LOAD is specified.
<SUPPORT_RESTRAINT
BODY = "/SYS1/Cube_bod"
FE_MODEL = "/Coupling/Vehicle_part"
NODE_LIST = "101:103"
/>
(d) Constraint of MB belt to external FE node
POINT_OBJECT.MB being referred from a BELT_SEGMENT now facilitates con-
necting a belt segment to an external coupled finite element model. Here follows
an example which illustrates the usage.
<BELT_SEGMENT
ID="4"
NAME="belt4_Buc_Part"
POINT_REF_1="belt2_Buc"
POINT_REF_2="belt4_Buc"
CHAR="char_132"
INITIAL_STRAIN="5.000000E-05"
ADD_LENGTH="0.0"
/>
<POINT_OBJECT.MB
ID="3"
NAME="belt2_Buc"
FE_MODEL="/Coupling_Sys/Ext_Fem"
NODE="4"
/>
<POINT_OBJECT.MB
ID="8"
NAME="belt4_Buc"
FE_MODEL="/Seat_Sys/Shoulder_Belt_Fem"
NODE="77"
/>
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