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Determination of plastic material properties by analysis of residual imprint geometry of indentation

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Abstract

A method is presented for the identification of plastic material properties, i.e., yield strength and work hardening rate, using the residual imprint geometry formed by a spheroconical indentation. A corresponding finite element simulation with the same tip geometry and maximum as applied in the indentation experiment yields a numerical imprint profile. Then, the imprint profiles resulting from simulation and experiment are compared, and the material parameters of the simulation are varied by an optimization procedure until a satisfying agreement between simulation and experiment is established. At this stage, the material parameters used for the simulation represent the true material properties. It is shown that this procedure yields unique results that are furthermore verified by independent uniaxial straining experiments. Finally, the reliability of this method with special emphasis on its sensitivity with respect to measurement errors of the imprint geometry is demonstrated. Hence, it is concluded that the residual imprint can be regarded as the fingerprint of a material that contains sufficient information on plastic material behavior to uniquely extract values for yield strength and work hardening rate.

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Acknowledgments

The authors gratefully acknowledge support concerning the optimization strategy from Christoph Begau, as well as help with specimen preparation and laboratory work from Rehman Hameed, both from our institute. We further express thanks to ThyssenKrupp AG, Bayer Material Science AG, Salzgitter Mannesmann Forschung GmbH, Robert Bosch GmbH, Benteler Stahl/Rohr GmbH, Bayer Technology Services GmbH, and the state of North-Rhine Westphalia as well as the European Commission in the framework of the European Regional Development Fund (ERDF) for financial support and particularly thanks to the ThyssenKrupp AG for providing the multiphase steel material.

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  1. Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universitaet Bochum, 44801, Bochum, Germany

    Benjamin Schmaling & Alexander Hartmaier

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  1. Benjamin Schmaling
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  2. Alexander Hartmaier
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Correspondence to Benjamin Schmaling.

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Schmaling, B., Hartmaier, A. Determination of plastic material properties by analysis of residual imprint geometry of indentation. Journal of Materials Research 27, 2167–2177 (2012). https://doi.org/10.1557/jmr.2012.212

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