Friction Calculation for Two Different types of materials
Friction Calculation for Two Different types of materials
(OP)
Dear All,
I need to calculate Kinetic friction for two different types of material.The materials are PVC and Cotton Box.I could not find any standard values from internet.If i need to calculate the friction for different combination material.How should i calculate? Could anyone guide me Please?
Thank You,
Regards,
John.
I need to calculate Kinetic friction for two different types of material.The materials are PVC and Cotton Box.I could not find any standard values from internet.If i need to calculate the friction for different combination material.How should i calculate? Could anyone guide me Please?
Thank You,
Regards,
John.





RE: Friction Calculation for Two Different types of materials
RE: Friction Calculation for Two Different types of materials
(The answer of course is "no")
je suis charlie
RE: Friction Calculation for Two Different types of materials
Grab a sample of whatever material you need to test the friction coefficient.
Weigh it.
Put it on the mating material you want to measure the friction coefficient between.
Tilt the base until the sample material begins to slide.
Measure the angle.
Ff = Coeff * FN
Based on the angle you measured, and the weight (aka force) of your sample, you can calculate the component forces. The only variable left in the equation is the coefficient of sliding friction.
--Scott
www.wertel.pro
RE: Friction Calculation for Two Different types of materials
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Friction Calculation for Two Different types of materials
RE: Friction Calculation for Two Different types of materials
An extreme example is some stainless steels on each other.
Tables XI and XII here -
http://www.nickelinstitute.org/~/Media/Files/Techn...
RE: Friction Calculation for Two Different types of materials
je suis charlie
RE: Friction Calculation for Two Different types of materials
That's not a empty Cotton box.It have coffee Bag.It would be around 10 kg weight.
RE: Friction Calculation for Two Different types of materials
RE: Friction Calculation for Two Different types of materials
You are correct. I was thinking about this after I posted that the test isn't totally complete.
Get a much bigger piece of base material. After it starts sliding, decrease the angle until it stops sliding. That will give you the coefficient of kinetic (sliding) friction instead of static friction.
And absolutely take a lot of samples!
--Scott
www.wertel.pro
RE: Friction Calculation for Two Different types of materials
I think what you'll find is that over time the cotton textile material repeatedly sliding over the PVC will polish its surface and reduce both the static and dynamic friction coefficients at the contact interface. The same thing occurs with many other sliding contacts, where the friction coefficients drop as the parts "break in". This is something you may need to take into account with your design.