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A hybrid method for determining material properties from instrumented micro-indentation experiments

Published online by Cambridge University Press:  03 March 2011

Y-M. Chen,
A.W. Ruff and
J.W. Dally
Y-M. Chen
Affiliation:
Mechanical Engineering Department, University of Maryland, College Park, Maryland 20742
A.W. Ruff
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
J.W. Dally
Affiliation:
Mechanical Engineering Department, University of Maryland, College Park, Maryland 20742
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Abstract

The impact code EPIC was employed to study the relationship between the applied force and the penetration depth in a micrometer-scale indentation experiment with oxygen free high conductivity (OFHC) copper. EPIC is an elastic-plastic finite element code that uses a Lagrangian formulation and triangular mesh, which can accommodate large deformation without the need to remesh during the computation process. By fitting the force-penetration curves for a triangular indenter with second degree polynomials, it was demonstrated that the fit changed with two material constants in the constitutive equation. A systematic procedure for determining the material constants is described that is based on matching either the slope or the curvature of the force penetration depth curves from numerical simulation and experiments. It is concluded that material constants can be determined from indentation data obtained using pyramidal or spherical indenters as well as a flat-ended indenter.

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Articles
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Journal of Materials Research , Volume 9 , Issue 5 , May 1994, pp. 1314 - 1321
Copyright
Copyright © Materials Research Society 1994

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