Wear testing using standardized samples such pin on disk,
three-balls-in-socket, rubbing disk, etc. have no bases in reality
since the wear systems of any "standardized test" and the application
are very different.
Best practice is to build a prototype of the machine (or small
subsection of the full size machine) and test it directly measuring
material loss (wear) via dimensional loss and gravimetric (weight)
loss. Protoype and subsection testing more closely duplicates the wear
systems in the actual machine application. Accelerated testing using
stanardized samples or even prototype testing is a risk - wear systems
are often velocity and time depenedent and hence the output of an
experiment is confounded with time.
Thankyou very much for your reply.
I have a possiblity of conducting wear test on pilot plant simulating
actual process, I can produce the worn surface with this pilot plant
but my main intention is understing wear mechanism and for that I need
to do metallurgical analysis of this surface with SEM or AFM.
Can you guide me, how can I proceed for this?
thanks for your help,
An SEM will show you changes in surface morphology during wear if
replica samples are taken of the subject aticle peroidically - or if
the article can be examined directly.
IMHO the atomic force microscpe (AFM) is to "close to the action" to
show anything useful - also returning to the same location to
deterimine changes from wear over time are problematic. Using EDS and
X-ray mapping in a SEM - asuming the rubbing surfaces are chemically
different would be more useful. Examination of collected wear debris
(using wash fluids or adhesive tape in dry situation) will give insight
into primary and secondary wear mechanisms.
ICP of the wear debris may also tell you exactly what is wear the most.
A metallographic cross section of the wear surface may show if
fracture or deformation are predominate in specific wear of metals.
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