Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6921
Title: A systematic study of the validation of Oliver and Pharr’s method
Authors: Shu, S
Lu, J
Li, D
Issue Date: Dec-2007
Source: Journal of materials research, Dec. 2007, v. 22, no. 12, p. 3385-3396
Abstract: Oliver and Pharr’s method (O&P’s method) is an efficient and popular way of measuring the hardness and Young’s modulus of many classes of solid materials. However, there exists a range of errors between the real values and the calculated values when O&P’s method is applied to materials not included in the basic assumption proposed initially. In this article, the dimensional analysis theorem and the finite element method are applied to evaluate errors for high elastic (E/σ[sub Y]→5) to full plastic (E/σ[sub Y] →1000) materials with different strain-hardening exponents from 0 to 0.5. A new method is proposed to correct errors obtained using O&P’s method. The numerical simulation results show that the errors obtained using O&P’s method, given in the form of charts, are mainly dependent on the ratio of the reduced Young’s modulus to the yield stress (i.e., E[sub r]/σ[sub Y]) and the strain-hardening exponent, n, for an indenter with a fixed included angle. The two mechanical properties, which can be extracted from the load–depth curves of two indenters with different included angles, are used to correct the errors in the hardness and Young’s modulus of the indented materials produced by O&P’s method.
Keywords: Elastic moduli
Elasticity
Error analysis
Error correction
Plasticity
Strain hardening
Yield stress
Publisher: Cambridge University Press
Journal: Journal of materials research 
ISSN: 0884-2914
EISSN: 2044-5326
Rights: © 2007 Materials Research Society The following article "Siqi Shu, Jian Lu and Dongfeng Li (2007). A systematic study of the validation of Oliver and Pharr’s method. Journal of Materials Research, 22(12), pp 3385-3396. doi:10.1557/JMR.2007.0428." is available at http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7953970
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