Friction Coefficient 1

[EGineMike]

Hi, I am looking forward to find out the value of the static friction coefficient of the stainless steel 17-4 PH H1150 on the stainless steel 1.4034, considering that the contact face is dry.
I do have some information precising a static coefficient of 0.2 for a dry 'steel on steel' contact area, do anybody can validate this value?

 

[PST09]

http://www.engineershandbook.com/Tables/frictioncoefficients.htm

This table might help, it allows you to compare two materials. I dont think you will be able to get an exact coefficient for the specific materials that you have mentioned other than by testing the two materials.

http://chain-guide.com/basics/2-3-1-coefficient-of-friction.html

Based on the above, The 0.2 that you refer to would indicate a lubricated steel surface.

 

[rb1957]

surely the surface finish has as much (more?) to do with this as the material ?

 

[ChipB]

Well, if you have access to both materials, you can place one on top of the other, start raising one end of the bottom piece, and measure the angle that the piece on top begins to slide. The tangent of that angle is your coefficient of static friction. Obviously, you want to apply some factor of safety to that value.

 

[EGineMike]

Yes we definitively have to go for some tests here. Unfortunately the results may be away from the real case where these two surfaces are exposed to an extremely cold atmosphere(about 144K). The shape of the surface finish is really particular: combining rough and smooth areas. Furthermore, simulation provided us with the information that the two contact faces are not in colinear planes, which will definitively affect the friction coefficient value.