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On the determination of spherical nanoindentation stress-strain curves
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/1195
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| Title: | On the determination of spherical nanoindentation stress-strain curves |
| Authors: | Barsoum, Michel W.
Basu, Sandip
Moseson, Alexander J. |
| Keywords: | Mechanical-Properties
Carbon Materials
Glassy-Carbon
Kink Bands
Indentation
ZNO
Deformation
Graphite |
| Issue Date: | Oct-2006 |
| Publisher: | Materials Research Society |
| Citation: | Journal Of Materials Research, 21(10), 2628-2637. http://dx.doi.org/10.1557/JMR.2006.0324 |
| Abstract: | Instrumented nanoindentation experiments, especially with sharp tips, are a
well-established technique to measure the hardness and moduli values of a wide range
of materials. However, and despite the fact that they can accurately delineate the onset
of the elasto-plastic transition of solids, spherical nanoindentation experiments are less
common. In this article we propose a technique in which we combine (i) the results of
continuous stiffness measurements with spherical indenters – with radii of 1 m and/or
13.5 m, (ii) Hertzian theory, and (iii) Berkovich nanoindentations, to convert
load/depth of indentation curves to their corresponding indentation stress–strain curves.
We applied the technique to fused silica, aluminum, iron and single crystals of
sapphire and ZnO. In all cases, the resulting indentation stress–strain curves obtained
clearly showed the details of the elastic-to-plastic transition (i.e., the onset of yield,
and, as important, the steady state hardness values that were comparable with the
Vickers microhardness values obtained on the same surfaces). Furthermore, when both
the 1 m and 13.5 m indenters were used on the same material, for the most part,
the indentation stress–strain curves traced one trajectory. The method is versatile and
can be used over a large range of moduli and hardness values. |
| URI: | http://hdl.handle.net/1860/1195 |
| Appears in Collections: | Faculty Research and Publications (MSE)
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