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

Abaqus Inertia Relief

Abaqus Inertia Relief

Abaqus Inertia Relief

I currently have an Abaqus model and it is giving me the following errors:

The model has no boundary conditions for inertia relief. This may cause at the most 6 numerical singularity warnings during each equilibrium iteration in the analysis. The displacement solution will be postprocessed to remove unconstrained rigid body motion. However, any extra numerical singularity messages may indicate other problems; please rerun the analysis with statically determinant boundary conditions

Inertia relief load will not be applied to elements that do not have a mass or inertia property associated with them, for example, acoustic elements, springs and dashpots; do not have finite boundaries, for example, infinite elements; or do not support fixed boundaries, for example, elements with foundation loads. In this model such elements are identified in the set irloadn.

This model contains gap/coupling/dashpot/spring elements and/or kinematic constraints which may cause unbalanced internal forced/moments associated with internal boundary conditions, E.F., ground node in spring1 elements. These internal forces/moments are not balanced by inertia relief loads. They appear as reaction forces/moments if sufficient boundary conditions are present; otherwise they appear as unconverged residual fluxes in the .msg file.

These three errors I cannot seem to fix. When I add boundary conditions I get a new error stating that the model is overconstrained. I have added contact initialization to remove over closures and gaps which does not solve the gap error. I have done a modal analysis and all regions are connected. There are structural couplings connecting masses to the model but no kinematic connections.

Any ideas would be awesome!

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! Already a Member? Login


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close