I have data from an experiment conducted to measure kinematic co-efficient of friction. But to know how much slipping force is required to slip the interfaces (steel plates) , I need static co-efficient of friction (the threshold value). Is there any relation available to calculate this?
Thanks!
Hi Abhishek,
The static friction coefficient is mostly given by the so-called "ageing" of the asperities in contact. The more time asperities are in a stationary contact, the stronger their bonds and the larger the friction coefficient. When asperities are in a stationary contact the strength of their bonds increases until the friction coefficient reaches the static friction coefficient value. The dynamic friction coefficient does not show any ageing of the asperities, since during sliding they "do not have time" to age. This is a very simplistic explanation of one of the main differences between static and dynamic friction coefficient.
You can find some equations as a starting point in the paper:
"Physical analysis of the state- and rate-dependent friction law. II. Dynamic friction" T. Baumberger and P. Berthoud, 1999
Alfredo Fantetti thanks for the explanation. Can you suggest some empirical formula that is widely used for relation between static and dynamic friction?
Abhishek Parida as suggested in my previous reply, you can find some equations as a starting point in the paper:
"Physical analysis of the state- and rate-dependent friction law. II. Dynamic friction" T. Baumberger and P. Berthoud, 1999
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