As we know, the hardness of materials always increases with lowering loading pressure. And this effect also relates to the properties of materials, Sometimes the size effect is not so clear. I can't understand this effect well. Is there anybody can explain it or provide some detailed references?
There is a LOT of literature which examines the indentation size effect in great detail. As a starting point, I recommend Pharr, Herbert & Gao in Annual Review of Materials Science, 40, pp271-292 (2010) and the references contained therein.
I developed a habit of converting hardness numbers to Meyer Hardness (mean pressure) which is the first step if you would like to develop a flow stress-strain behavior during indentation. Size effect for the indenter is taken into account during these calculations.
Yes, there are lot of references on this subject. Normally, if the size of indenter is bigger, the hardness number is smaller. As for my normal practice, especially for the micro hardness tester, make sure the indenter is sharp enough to give the meaningful reading.
I also recommend on this topic the reviews by :
Bull, S., 2003. On the origins and mechanisms of the indentation size
effect. Zeitschrift für Metallkunde 94, 787–792.
Cheng, Y., Cheng, C., 2004. Scaling, dimensional analysis, and indentation
measurements. Materials Science and Engineering R 44, 91–149.
Please Find attached. Below articles might be helpful.
http://onlinelibrary.wiley.com/doi/10.1002/app.43532/full
http://www.sciencedirect.com/science/article/pii/S0032386116301227
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