Description of Unloading Behavior of Berkovich Nanoindentation


Article Preview

We established a new expression to describe the nanoindentation unloading data by assuming that the Berkovich indenter behaves as a conical punch, rather than a paraboloid punch, and properly considering the effect of residual contact stress on the unloading load-displacement relation. The validity of this new approach was confirmed by analyzing the experimental data obtained for a series of brittle materials. It was shown that, compared with the generally adopted power law, this new expression has much clearer physical significance.



Key Engineering Materials (Volumes 280-283)

Edited by:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li




H. Z. Miao et al., "Description of Unloading Behavior of Berkovich Nanoindentation", Key Engineering Materials, Vols. 280-283, pp. 1757-1760, 2005

Online since:

February 2007




[1] M.F. Doerner and W.D. Nix: J. Mater. Res. Vol. 1 (1986), p.601.

[2] W.C. Oliver and G.M. Pharr: J. Mater. Res. Vol. 7 (1992), p.1564.

[3] I.N. Snedden: Int. J. Eng. Sci. Vol. 3 (1965), p.47.

[4] G.M. Pharr and A. Bolshakov: J. Mater. Res. Vol. 17 (2002), p.2660.

[5] M. Troyon and M. Martin: Appl. Phys. Lett. Vol. 83 (2003), p.863.

[6] B.R. Lawn, A.G. Evans and D.B. Marshall: J. Am. Ceram. Soc. Vol. 63 (1980), p.574.

[7] E.H. Yoffe: Philos. Mag. A Vol. 46 (1982), p.617.

[8] S.S. Chiang, D.B. Marshall and A.G. Evans: J. Appl. Phys. Vol. 53 (1982), p.298.

[9] A.C. Fischer-Cripps: Vacuum Vol. 58 (2000), p.569.