Coefficient of friction for bronze on stainless steel?

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Discussion Overview

The discussion centers around the search for static and dynamic coefficients of friction for bronze on stainless steel under dry conditions. Participants explore the variability of friction coefficients and the challenges in obtaining reliable values from existing resources.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant, Chris, requests specific coefficients of friction for bronze on stainless steel, noting the lack of available data for dry conditions.
  • Another participant suggests that friction coefficients can vary significantly based on surface topography and recommends experimental determination over tabulated values.
  • Chris expresses the need for a general value for preliminary design, indicating that experimental methods are not feasible for their situation.
  • A participant mentions a table that specifies a coefficient of 0.35 for steel and phosphor bronze, proposing it as a lower bound for regular bronzes.
  • Another participant describes a method for experimentally determining the static coefficient using a sine plate setup, emphasizing the dynamics involved.
  • One participant notes their inability to find the requested information and mentions a potential source to check later.

Areas of Agreement / Disagreement

Participants generally agree on the variability of friction coefficients and the challenges in finding reliable data. However, there is no consensus on specific values for bronze on stainless steel, and multiple approaches to obtaining this information are discussed.

Contextual Notes

The discussion highlights limitations in available resources and the dependence on surface conditions, as well as the unresolved nature of the specific coefficients sought.

Who May Find This Useful

Individuals involved in materials science, mechanical engineering, or design processes requiring friction coefficient data may find this discussion relevant.

servaa
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Hello,

I am looking for static and dynamic coefficients of friction for bronze on stainless steel (dry condition). Closest thing I could find was http://www.engineershandbook.com/Tables/frictioncoefficients.htm" where it only has steel on bronze under greasy condition.

Can anyone help me?

Thanks,
Chris
 
Last edited by a moderator:
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Friction coefficients are notorious for being all over the map, since they can be very strongly dependent on surface topography. I would recommend determining the coefficients experimentally, rather than using values from a table.
 
I am doing a quick calculation for preliminary design, and experimental method is not an option. I was hoping someone could provide a general value.
 
I don't know any online resources, but will try to remember to look in my materials handbooks when I get a chance.

Your table specs 0.35 for steel and phosphor bronze. You can use that as a nearby lower bound, as phosphor bronzes tend to have lower friction than regular 12% bronzes.
 
Sounds perfect, Gokul. Thanks in advance for help.
 
If you fix a flat piece to a sine plate and put another flat piece of the other material on top of that, you can slowly jack it up until it slides off. The static coefficient can be derived from the angle of the incline with some simple dynamics.
 
No luck on this number so far. There's one other place I could check, but that'll have to wait till after the weekend.
 

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