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Techniques for Determining Mechanical Properties of Power-Law Materials by Instrumented Indentation Tests

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Abstract:

A novel optimization approach is proposed to extract mechanical properties of a power law material from its given experimental nano-indentation P-h curves. A set of equations have been established to relate the P-h curve to mechanical properties, E, σ y and n, of a material. Using the proposed optimization approach, convergence studies were carried out for the determination of the mechanical properties of materials. It was found that the mechanical properties of an elastic-plastic material usually cannot be uniquely determined using a single loading and unloading P-h curve. Thus a technique has also been developed to determine the material properties from indentation p-h curves using indenters with two different angles. This enables the mechanical properties of materials to be uniquely determined.

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Periodical:

Key Engineering Materials (Volumes 340-341)

Pages:

555-562

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.340-341.555

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Online since:

June 2007

Authors:

J. Lin, J. Luo, Trevor A. Dean

Keywords:

Finite Element (FE) Simulation, Material Property, Nanoindentation, Optimization, Power-Law Materials, Strain-Hardening

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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