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

Published online by Cambridge University Press:  06 August 2012

Benjamin Schmaling  and
Alexander Hartmaier
Benjamin Schmaling*
Affiliation:
Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universitaet Bochum, 44801 Bochum, Germany
Alexander Hartmaier
Affiliation:
Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universitaet Bochum, 44801 Bochum, Germany
*
a)Address all correspondence to this author. e-mail: benjamin.schmaling@icams.rub.de
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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.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 16 , 28 August 2012 , pp. 2167 - 2177
Copyright
Copyright © Materials Research Society 2012

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