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WARNING ID : 448 ** WARNING IN RIGID BODY DEFINITION

gslee

Hi,

Warning is as follows.

I connect the master node of the RBODY to beam element.

WARNING ID : 448
** WARNING IN RIGID BODY DEFINITION
DESCRIPTION :
MASTER NODE 1795 IS CONNECTED TO AN ELEMENT
-- RIGID BODY ID : 1633
-- RIGID BODY TITLE :

RIGID BODY ID 1634
PRIMARY NODE 1796
NUMBER OF NODES 8
SURFACE LINKED TO BODY 0
SKEW NUMBER 0
SPHERICAL INERTIA FLAG 0
REMOVE SLAVE NODES FROM RIGID WALL(IF=0) 0
CENTER OF MASS FLAG 1
ADDED MASS 0.000
ADDED INERTIA 0.000 0.000 0.000 0.000 0.000 0.000

SECONDARY NODES
1433 1435 1437 1456 1460 1471 1491 1495

Is it wrong?

<?xml version="1.0" encoding="UTF-8"?>

some nodes must be needed between master node of the RBODY and BEAM3N?

Thanks

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Crashphys

Your RBODY master nodes are connected to a 1D Beam3N element. As far as I know, this is a big no-no for RADIOSS. Read up on HM3420 in the Hypermesh tutorials to see how to appropriately make a bolt.

Also, when making RBODYs in RADIOSS, make sure you use the 'calculate node' option rather than selecting the node.

gslee

What does 'this is a big no-no for RADIOSS' mean?

and

In HM3420, center node of yellow and center node of purple is connected by RBE2?

image.png.833677d8801855ef21b2703937d18855.png

Thanks

Crashphys

It will be helpful if you share your model. In RADIOSS, you cannot connect an element of any type to the master node of a rigid set. The nodes that the beam3n are connected to are the master nodes for the rigid set defined by the slave nodes at the edges of your square holes. You connected a beam3n to those master nodes, which caused the error. I believe if you use another RBODY to connect the two nodes rather than a beam, your simulation will run.

RBE2 is the optistruct version of a rigid connector, which is effectively the same as RBODY in OptiStruct. Watch the video here from 2:10 onwards to see how to manually create a bolt.

https://www.youtube.com/watch?v=zwNIfNfaPWg

gslee

I want to use beam element to represent bending.

How can I do that?

Thanks

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