Friction coefficient between SS and PTFE
Friction coefficient between SS and PTFE
(OP)
Recently I came across a couple of pipe stress calculations with very low friction coefficient used for SS on PTFE pad.
Those coefficients varied from 0.05 to even 0.01. I started to look what teflon sliding pads vendors reccomend in their specifications.
I found one German producer who gives eksperimental coeff. 0.016 and design 0.017 for surface load 25 N/mm^2. For lesser looads coefficient is of course higher and ends with values 0.045 experimental and 0.06 design for loads 1.5 N/mm^2.
I never used friction coefficient less than 0.05 in my calsc, so I'm a little bit confused.
What is opinnion of forum members.
Those coefficients varied from 0.05 to even 0.01. I started to look what teflon sliding pads vendors reccomend in their specifications.
I found one German producer who gives eksperimental coeff. 0.016 and design 0.017 for surface load 25 N/mm^2. For lesser looads coefficient is of course higher and ends with values 0.045 experimental and 0.06 design for loads 1.5 N/mm^2.
I never used friction coefficient less than 0.05 in my calsc, so I'm a little bit confused.
What is opinnion of forum members.





RE: Friction coefficient between SS and PTFE
and
http://wisdotresearch.wi.gov/wp-content/uploads/Wi... not sure how applicable this report is to your specific problem.
TTFN
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RE: Friction coefficient between SS and PTFE
RE: Friction coefficient between SS and PTFE
I have no access to AASHTO Specifications.
IRstuff
Engineering ToolBox lists strange coefficients.
For example steel on steel - 0.8
Also here http://hypertextbook.com/facts/2005/steel.shtml
I can't find familiar value of 0.3.
Am I in a parallel Universe???
RE: Friction coefficient between SS and PTFE
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RE: Friction coefficient between SS and PTFE
http://www.asme.org/about-asme/membership/professi...
RE: Friction coefficient between SS and PTFE
Note also, numbers used in calculations are often unrelated to values that might actually be observed in real life. Your low value might be for a particular analysis case, be it worse or best. This will definitely be different than the published values, which are supposedly more like mean or median values.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Friction coefficient between SS and PTFE
Teflon is a trade name. To support a load TFE needs to be filled with glass or other mineral. If not the TFE will extrude when under load. The composite has different values compared to pure TFE. This explains the variation in coefficient of friction quoted in industry.
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RE: Friction coefficient between SS and PTFE