Techniques for Determining Mechanical Properties of Power-Law Materials by Instrumented Indentation Tests
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.
N. Ohno and T. Uehara
J. Lin et al., "Techniques for Determining Mechanical Properties of Power-Law Materials by Instrumented Indentation Tests", Key Engineering Materials, Vols. 340-341, pp. 555-562, 2007