×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Abaqus - tilt test platform barriers design

Abaqus - tilt test platform barriers design

Abaqus - tilt test platform barriers design

(OP)
i'm trying to tilt a rigid body with point structural mass by tilting a rigid platform acting as ground , the whole body is under gravity, i have to analyze the counter bars standing on the tilt test platform, while trying following error was shown.

"Rotary inertia for the rigid bodies with the reference nodes listed below are not positive definite. Abaqus/Explicit now requires rigid bodies to have positive definite rotary inertia unless rotational constraints are applied with the *BOUNDARY option (see the Abaqus Analysis Users Manual). Nodes that are part of a rigid body do not require mass and inertia individually, but the rigid body as a whole must possess positive definite rotary inertia unless constraints are used. To remedy this error, either add rotational constraints to the reference nodes with the *BOUNDARY option or add inertia using the *ROTARY INERTIA option, whichever is appropriate to obtain the desired response. A node set named "ErrNodeRefNodeNoRot1Axis" containing the problematic reference nodes is also created for use in Abaqus/Viewer to help locate the error and modify the input definition."

ErrNodeRefNodeNoRot1Axis is the point of inertia assigned to rigid block.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources