Calculating the elastic modulus from nanoindentation and microindentation reload curves

The Oliver–Pharr method was used to calculate the elastic modulus from the reloading curve and was compared to the traditional unloading curve method. Nanoindentation and microindentation testing instruments were used. This method was applied to load–unload–reload–unload, multistep, and cycle indent...

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Bibliographic Details
Published in:Materials characterization 2007-04, Vol.58 (4), p.380-389
Main Authors: Shuman, David J., Costa, André L.M., Andrade, Margareth S.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Elastic modulus
Exact sciences and technology
Materials science
Metals
Microindentation
Nanoindentation
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Reload curve
Solidification
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Summary:The Oliver–Pharr method was used to calculate the elastic modulus from the reloading curve and was compared to the traditional unloading curve method. Nanoindentation and microindentation testing instruments were used. This method was applied to load–unload–reload–unload, multistep, and cycle indentation testing procedures at various hold times and force rates. On unloading the reverse plasticity added to the elastic recovery which increased the apparent elastic modulus. During reloading there was mainly elastic deformation making it more reliable for the elastic modulus calculation. It was also found that the metals tested started yielding between 70% and 100% of the reload curve. The reload indentation elastic modulus for fused silica and several metals was equivalent to the tensile test elastic modulus from reference literature.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2006.06.005