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Indentation Curve Analysis for Pile-up, Sink-in and Tip-Blunting Effects in Sharp Indentations

Published online by Cambridge University Press:  01 February 2011

Yeol Choi
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea. Research Center, Frontics, Inc., Seoul 151–060, Korea
Baik-Woo Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea.
Ho-Seung Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea.
Dongil Kwon
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea.
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Abstract

Hardness and elastic modulus can be derived from instrumented sharp indentation curves by considering the effects of materials pile-up and sink-in and tip blunting. In particular, this study quantifies pile-up or sink-in effects in determining contact area based on indentation-curve analysis. Two approaches, finite-element simulation and theoretical modeling, were used to describe the detailed contact morphologies. The ratio of contact depth to maximum indentation depth was proposed as a key indentation parameter and was found to be a material constant independent of indentation load. In addition, this parameter can be determined strictly in terms of indentation-curve parameters, such as loading and unloading slopes at maximum depth and indentation energy ratio. This curve-analysis method was verified by finite-element simulations and nanoindentation experiments.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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References

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Indentation Curve Analysis for Pile-up, Sink-in and Tip-Blunting Effects in Sharp Indentations
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