×
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

Temperature dependance friction coefficient

Temperature dependance friction coefficient

Temperature dependance friction coefficient

(OP)
Does anyone have any data or general knowledge of the effects of temperature on the friction coefficient of metals? In particular steel on oil-impregnated brass? Thanks for your help!

RE: Temperature dependance friction coefficient

dm3415,

Here's some very general knowledge:

I don't believe that temperature (as long as the temperatures are not extreme) will have much effect on a dry metal-to-metal interface friction.  But temperature will affect any lubricant film present, especially a liquid like your oil.  Higher temperatures in general will decrease oil viscosity and should produce lower frictions in most contacts regimes (hydrodynamic, mixed or boundary).

Besides friction, temperatures most definitely will have an effect on the surface fatigue strength of your shaft/bearing materials.

Most lubricants also have flash temperature limits.  If there is sufficient local heating at the contact zone to flash off the lubricant, you will immediately have un-lubricated metal-to-metal contact and the friction (plus the heat it generates) will immediately jump up, compounding the problem.

Hope that was helpful.
Terry
 

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