×
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

Bolt Connections ?

Bolt Connections ?

Bolt Connections ?

(OP)
Hi, I am trying to model a threaded cap using FEA.  I've set up my loading, set up my mesh so I can do a convergence analysis, etc but am having trouble with the threaded connection.

I'm using the built in bolt connection (basically saying that I have a nut and it's threaded section is bolted to a rigig virtual wall).  I split the face of my ID so that the bolt connection applies over the distance of the (un-modeld)threads.  What I am finding is that I am getting a stress singularity at the edge of the face which I have defined as the threaded section.

I'm using Cosmos DesignStar but suspect that what I am seeing is not specific to this software.  Any ideas on how I can eliminate this stress singularity from my model?

RE: Bolt Connections ?

(OP)
After poking around a bit more it seems that my problem was comming from having selected the "tight fit" option.  According to the hlep file the "tight fit" option makes the threaded contact face rigid and it only deforms as a rigid body with the virtual bolt.

Is it inappropriate to not use this option on my threaded cap?

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