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Erschienen in:

2014 | OriginalPaper | Buchkapitel

Nanomechanical Characterization of Brittle Rocks

verfasst von : Annalisa Bandini, Paolo Berry, Edoardo Bemporad, Marco Sebastiani

Erschienen in: Nanomechanical Analysis of High Performance Materials

Verlag: Springer Netherlands

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Abstract

After an introduction describing the indentation techniques traditionally applied to the study of micromechanical properties of minerals and rocks, phenomena induced by the diamond tip’s penetration into crystalline rocks are analyzed. Crystalline rocks are characterized by low values of the critical breakage load, i.e. the threshold load corresponding to the transition from a ductile to a brittle behavior. As a consequence, it seems more convenient to examine the mechanical behavior of crystalline rocks by using instrumented nanoindentations. Above the critical load, ranging from rock to rock, fractures occur, affecting the indentation results and thus invalidating the values of the rock mechanical properties obtained by indentation data processing. In order to determine the correct values of the hardness and elastic modulus of brittle rocks, an innovative measurement modality for rocks, i.e. Continuous Stiffness Measurement mode, is proposed. By providing the continuous evolution of the hardness and of the elastic modulus as a function of the indentation depth, it has proven particularly suited to analyze the effects of induced fracturing on the load versus displacement curve.

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Titel: Nanomechanical Characterization of Brittle Rocks
verfasst von: Annalisa Bandini
Paolo Berry
Edoardo Bemporad
Marco Sebastiani
Verlag: Springer Netherlands
Buch: Nanomechanical Analysis of High Performance Materials
Print ISBN: 978-94-007-6918-2

Electronic ISBN: 978-94-007-6919-9

Copyright-Jahr: 2014
DOI: https://doi.org/10.1007/978-94-007-6919-9_11

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