ball cratering

I would like to know web sites where to find information about micro abrasion wear test (ball cratering) and micro abrasion test apparatus. In special, information of test made in different materials.

Thank you

 

[parnon]

Please try the Plint&Partners web site (

http://www.plint.co.uk).

As far as I know, they are specialist about microfriction equipment. Two years ago, I used their microfriction machine for my studies and as a result, I took very succesful results from my experiments.

Regards,

 

[CdotS]

Try this web site:

http://www.cetr.com

 

[satish16]

Susana,
Try CSEM website. They have something called as a CALO test equipment which is used to find the thickness of the PVD coatings. It makes use of a carbide ball and a flat coated surface. The ball rotates against the coated surface producing a crater. The diameters of the inner uncoated surface and the coated surface give the measure of coating thickness. I don't know if this is what you were looking for, but thought this could be some use to you.
Cheers
Satish

 

[Gerry45]

Does anyone know if there is a relationship between fretting corrosion and contact pressure in two microscopically sliding oscillating surfaces ?

I am trying to establish some load limits for ball bearings where there is a tendency to 'false brinell' due to load fluctuations when the brg is not rotating. The application is a wind turbine blade brg.

Some manufacturers have suggested that the relationship resembles a bending fatigue S-N curve, ie. below a certain contact stress level f/b will not occur regardless of how many movement cycles are made. I dont really believe this is the case. I think low contact stresses will create the same level of damage given sufficient cycles. Any thoughts or experience ?

Gerry