Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6018
Title: New method for determining Young's modulus by non-ideally sharp indentation
Authors: Ma, D
Ong, CW 
Wong, SF
He, J
Keywords: Elastic properties
Nanoindentation
Issue Date: Jun-2005
Publisher: Cambridge University Press
Source: Journal of materials research, June 2005, v. 20, no. 6, p. 1498-1506 How to cite?
Journal: Journal of materials research 
Abstract: In a previously developed method for estimating Young's modulus E by depth-sensing indentation with spherical-tipped Berkovich indenter, the E value is deduced from several functional relationships (established by finite element analysis) relating nominal hardness/reduced elastic modulus ratio (H[sub n]/E[sub r]) and elastic work/total work ratio (Wₑ/W). These relationships are specified for different absolute bluntness/maximum displacement ratios (Δh/h[sub m]). This paper reports the generalization of the method by proposing a function to replace all the above mentioned H[sub n]/E[sub r]-Wₑ/W relationships. The function contains only a parameter V[sub r] ≡ V[sub ideal]/V[sub blunt] instead of Δh/h[sub m], where V[sub ideal] is defined as the indented volume bounded by the cross-sectional areas measured at the maximum displacement hm for an ideally sharp indenter, and V [sub blunt] is that of the real indenter. The use of V[sub r] to replace Δh/h[sub m] is for the purpose of extending the application of the method for non-spherical tipped Berkovich indenters. The effectiveness of the method for materials of prominent plasticity was demonstrated by performing tests on carbon steel and aluminum alloy using three Berkovich indenters with different tip shapes.
URI: http://hdl.handle.net/10397/6018
ISSN: 0884-2914
EISSN: 2044-5326
DOI: 10.1557/JMR.2005.0193
Rights: © 2005 Materials Research Society
The following article "Dejun Ma, Chung Wo Ong, Sing Fai Wong and Jiawen He (2005). New Method for Determining Young’s Modulus by Non-ideally Sharp Indentation. Journal of Materials Research, 20(6), p. 1498-1506. doi:10.1557/JMR.2005.0193." is available at http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8029368
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