×
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

friction across painted joint

friction across painted joint

friction across painted joint

(OP)
Anyone know the friction coefficent across two metal surfaces that are painted and then bolted together?
Currently I'm using 0.16 which is the  same for lightly oiled surfaces, but does anyone know any better?

Cheers,

Andy

RE: friction across painted joint

The application and specific coating type vary the coefficient factor. For structural applications, refer to AISC-ASD, 9th Edition, Appendix A for further info.

RE: friction across painted joint

Andy,

Friction varies so much, even for the "same" conditions.  It is impossible to identify a single value for friction coefficient, so I question why anyone would publish a single value rather than a range.  Ranges for "lubricated" metal parts can range as low as ~ 0.05, but my experience has been that polymers (without PTFE or other low friction constituents) should not be below ~ 0.1.  Thus, I would use 0.1 to be conservative.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: friction across painted joint

(OP)
Super, thanks Cory. Being in the UK I don't have access to the AISC-ASD data.

Cheers,

Andy

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