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Instrumented Indentation Contact with Sharp Probes of Varying Acuity

Published online by Cambridge University Press:  01 February 2011

Dylan J. Morris
Dylan J. Morris*
Affiliation:
dylan.morris@nist.gov, National Institute of Standards and Technology, Materials Science and Engineering Laboratory, 100 Bureau Drive, MS 8520, Gaithersburg, MD, 20899, United States, 301 975 5458
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Abstract

While elastic and plastic material property extraction from instrumented indentation tests has been well-studied, similarly-based fracture property measurement remains difficult. Furthermore, estimation of the fracture toughness requires measurement of the crack lengths from a micrograph, which makes nano-scale indentation toughness measurement expensive and difficult. Initiation and propagation of cracks on the nano-scale requires a more acute indenter than a Berkovich or sphere, such as the cube-corner pyramid. Experiments described here were performed on a range of elastic, plastic and brittle materials with diamond indenters of acuity varying between the Berkovich and the cube-corner. These experiments reveal some of what is changed and what remains the same, when the acuity of the probe is changed, when fracture is initiated at the contact, or both. A preliminary model for the physical origin of the extra crack-driving power of acute probes is presented in light of these, and complementary macro-scale in-situ indentation experiments. This work provides the basis for development of instrumented indentation-based nano-scale toughness measurement.

Keywords

fracturescanning electron microscopy (SEM)adhesion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1049: Symposium AA – Fundamentals of Nanoindentation and Nanotribology IV , 2007 , 1049-AA06-09
Copyright
Copyright © Materials Research Society 2008

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References

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