ABAQUS Volume II: I–Z - Manual (Page 378)

*ROTARY INERTIA
In large-displacement analysis (an ABAQUS/Explicit analysis or when the NLGEOM
parameter is included on the *STEP option in an ABAQUS/Standard analysis), the local axes of
inertia rotate with the rotation of the node to which the ROTARYI element is attached.
Data line to define the rotary inertia:
First (and only) line:
1. Rotary inertia about the local 1-axis, .
2. Rotary inertia about the local 2-axis, .
3. Rotary inertia about the local 3-axis, .
4. Product of inertia, .
5. Product of inertia, .
6. Product of inertia, .
The rotary inertia should be given in units of ML
2
. ABAQUS does not use any specific physical
units, so the user’s choice must be consistent.
17.20–2
ABAQUS Version 6.1 Module: ID:
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