×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Why is the loads at the origin of the coordinate system in abaqus?

Why is the loads at the origin of the coordinate system in abaqus?

Why is the loads at the origin of the coordinate system in abaqus?

(OP)
Hello every one:

Rencently,I am working on the finite element analysis of the lumbar spine. I use Hypermesh to mesh model and save it as an inp file, then I use another commercial software to obtain boundary conditions such as constraints, amplitudes, loads, etc., and then I import the two files, but the loads are not distributed around the bones(Pic 1), but at the origin of the coordinate system(Pic 2) and position of constraint is not also correct. I have uploaded file, including grid files and boundary conditions, and I would appreciate it if anyone could help me.

Sincerely.

Pic1






Pic 2

RE: Why is the loads at the origin of the coordinate system in abaqus?

Please check if you can download the file using this link - it's not working for me. Maybe because of redundant extensions in the name of the file.

Can you say more about how you obtained these definitions and then exported and imported them ? Which software, file formats and tools did you use for that ?

RE: Why is the loads at the origin of the coordinate system in abaqus?

(OP)
Dear “FEA Way”:

Thank your for you reply. I cant‘t reupload the file, so i am sorry about that. But i believe that you only need to rename the file to “xx.zip” to open the file. Or you can leave your email address and I'll send the model to the mailbox. I'll explain in detail how these two files were obtained later.

Sincerely.

RE: Why is the loads at the origin of the coordinate system in abaqus?

The problem is that I can't download the file at all so I don't have a chance to rename it. We can't share e-mails here due to a risk of spam. So you would have to upload the file again in a new reply, it should be possible (unless you don't have access to this file anymore).

RE: Why is the loads at the origin of the coordinate system in abaqus?

(OP)

Dear "FEA Way";

I use the Anybody Modeling System(biomechanics modeling software)to export muscle force, joint reaction force and so on(Pic 1), these data are in xml format. Then this software provide the plug-in, this plug-in can combine the boundary conditions of this xml format with the mesh file, eventually, you will get a output.inp file(Pic 2). The first line of output.inp which contains a reference, that is, the path to the mesh file, and then the rest are all boundary conditions, load, muscle force, amplitude, and so on. Unfortunately, the plug-in is very old or not compatible with abaqus. When I imported output.inp, abaqus popped up a lot of warnings showing The keyword misplaced(Pic 3).... However, when I use hypermesh to mesh and generate an inp file, there is no warning to import abaqus, but the display of loads and constraints becomes abnormal. So, I think I'm in a dilemma.
Do you have any experience dealing with this kind of problem?

Sincerely.

Pic 1


Pic 2


Pic 3


RE: Why is the loads at the origin of the coordinate system in abaqus?

(OP)
However, I have an "unconventional" way of handling warnings, which is to delete all the *part and *Assembly keywords in the mesh file, but I don't think this is the best solution to the problem. I have uploaded mesh and boundary files in the attachment. After the two files are imported into ABAQUS, the loads and constraints are displayed normally.

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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