Coefficient of Friction Calculation 1

[AImrie]

Hi,

Can anyone tell me if there is a way to calculate the coefficient of friction if you have a bolt load (N) and the torque applied (Nm)?

Thanks,

A

 

[doct9960]

AImrie,

There's a topic about "torque vs. tension relationship" in here...

http://www.pdhonline.org/courses/s149/s149content.pdf

Also check out the links in here...

http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm

 

[MintJulep]

There is also a torque - tension relationship FAQ right in this foura.

 

[israelkk]

AImrie

Torque calculation uses the friction coefficent under the bolt head and in the thread. They are not always the same. Therefore, it will be better to go to my opinion with the equivalent K value. Where: Torque = K*Bolt_diameter*Force.

If you measure the bolt load and the torque you can calculate K.

If you assume the same coefficient of friction under the head and in the thraed then you can calculate it from K.

 

[AImrie]

That's great, thanks for the help.

A