Static/kinetical friction coefficient

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Discussion Overview

The discussion revolves around the static and kinetic friction coefficients between rubber and steel, specifically in the context of a conveyor belt application. Participants explore the variability of these coefficients based on material types and conditions.

Discussion Character

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

Main Points Raised

  • One participant inquires about the static and kinetic friction coefficients for rubber and steel, particularly for a conveyor belt application.
  • Another participant notes that the friction coefficient is highly dependent on the specific materials used, suggesting that different types can yield vastly different values.
  • A further inquiry is made about how to determine average friction values, indicating a need for practical data.
  • A suggestion is made to refer to a specific website for friction data, emphasizing the importance of being conservative in estimates due to variability from material specifics and potential contaminants.
  • One participant clarifies the materials involved, stating they are steel and polyester, and expresses a need to understand friction to calculate power losses in the system.

Areas of Agreement / Disagreement

Participants generally agree that the friction coefficients can vary significantly based on material specifics and conditions, but no consensus is reached on specific values or methods for determining them.

Contextual Notes

Limitations include the lack of specific friction coefficient values and the dependence on the definitions of the materials involved, as well as the potential impact of contaminants on the friction measurements.

alphaomega@ho
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hello,

I 'd like to know the static/kinetical friction coefficient between rubber- steel (the most commonly used), I searched the internet but whithout succes
the application is: a conveyor belt that makes contact with a troughing roller)
anyone can help me ?

thank you !
 
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This will be highly dependent on the particulars of the two materials. Different types can have vastly different friction coefficients.
 
and how can I determine those numbers, I just want an average value for the friction

thank you
 
You can use this one:
http://www.diracdelta.co.uk/science/source/f/r/friction/source.html

Generally, if you need to use data like this, you need to be very conservative in your approach because it can vary widely due to the actual materials being used, and even due to contaminants such as water or oil that may get between the parts. If the design is such that you don't want the parts to slide, a conservatively low value for the coefficient is used. If you need it to slide, a high value is used. Take into consideration that your particular interface might be subject to contamination.
 
hey, I did find out the two materials:

steel (in general) and polyester (PE)
I have to know the friction because I want to know the power losses when I want to drive this PE belt across a serie of troughing idler( those supporte the belt when there weight on it)

thank for the help!
 

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