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

Contact between two surfaces

Contact between two surfaces

Contact between two surfaces

I have model where a bolt is bounded on both the nut and head by fixed supports.  the bolt starts in the middle of a hole in a steel rectagular plate.  I have defined the two surfaces (bolt shank and inside of the hole on the plate) with no separation after contact.)  I establish initial BC in the intitial step.  In step 1 I displace the plate the distance of the plate hole radius minus the bolt diameter to establish contact.  In step 2 I put a force on the end of the plate.  Is this the right way to establish contact?  

RE: Contact between two surfaces


It appears you are trying to establish contact between the bolt shank and the hole id. Usually this is not required, unless you have a special fit between the bolt and the hole. Normally you need a contact below the head and a tie/bonded contact in the area of bolt threads.


RE: Contact between two surfaces

The plates must be in shear presumably for the hole id to make contact with the bolt shank. I'd have just added an extra little bit of displacement to establish contact forces in the first step before removing that and applying the true load in the second step.


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


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