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Friction Coefficient

Friction Coefficient

Friction Coefficient

(OP)
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?  

RE: Friction Coefficient

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

RE: Friction Coefficient

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.

RE: Friction Coefficient

(OP)
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.
 

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