Nanoindentation Size Effect of KDP Crystal by Instrumented Indentation Testing


Article Preview

Indentation tests and single-point scratch tests are probably the simplest methods of measuring the elastic, plastic and fracture behavior of brittle materials. In this paper, the nearsurface mechanical properties of KDP single crystal have been investigated including the elasticity like Young’s modulus E, and the plasticity like the hardness H. These material properties can be used to predict the material responses in optical manufacturing operations. Hardness and elastic modulus on different crystal plane of KDP single crystal have been examined under different loads by nanoindentation test, and the influence of the indentation load on hardness and elastic modulus have been also analyzed systematically. The results show the nanoindentation size effect, that is, the hardness and elastic modulus increase as the indentation load decreases. The hardness and elastic modulus have strong anisotropy in the different crystallographic orientation of the same crystal plane.



Key Engineering Materials (Volumes 364-366)

Edited by:

Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO




H.X. Wang et al., "Nanoindentation Size Effect of KDP Crystal by Instrumented Indentation Testing", Key Engineering Materials, Vols. 364-366, pp. 188-192, 2008

Online since:

December 2007




[1] Baruch. A, Fuchs. P: Applied optic. Vol. 25 /11 (1986), p.1733.

[2] Yang Li: Advanced optical production technology (Science Press, China 2001).

[3] Zhang, Taihua: Micro/nanometer mechanical testing technique and its application (China Machine Press, China 2005).

[4] W. C. Oliver, G. M: J. Mater. Res. Vol. 19/1 (2004), p.3.

[5] G. M. Pharr, W. C. Oliver: J. Mater. Res. Vol. 7/6 (1992), p.1564.

[6] W. S. Hua, X. F. Wu, D. H. Shen: Suface and Interface Analysis. Vol. 36 (2004), p.143.