Determination of the effective zero-point and the extraction of spherical nanoindentation stress–strain curves

In this paper, we present a novel approach to converting the load–displacement data measured in spherical nanoindentation into indentation stress–strain curves. This new method entails a new definition of the indentation strain, a new procedure for establishing the effective zero-load and zero-displ...

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Bibliographic Details
Published in:Acta materialia 2008-08, Vol.56 (14), p.3523-3532
Main Authors: Kalidindi, Surya R., Pathak, Siddhartha
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Elastic behavior
Exact sciences and technology
Indentation
Mathematical analysis
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metal and alloys
Metals. Metallurgy
Modulus of elasticity
Nanoindentation
Strain
Stress and strain
Stress strain curves
Stress-strain relationships
Yield phenomena
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Summary:In this paper, we present a novel approach to converting the load–displacement data measured in spherical nanoindentation into indentation stress–strain curves. This new method entails a new definition of the indentation strain, a new procedure for establishing the effective zero-load and zero-displacement point in the raw dataset, and the use of the continuous stiffness measurement (CSM) data. The concepts presented in this paper have been validated by finite element models as well as by the analysis of experimental measurements obtained on aluminum and tungsten samples. It is demonstrated that the new method presented in this paper produces indentation stress–strain curves that accurately capture the loading and unloading elastic moduli, the indentation yield points and the post-yield characteristics in the tested samples.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2008.03.036