Aim of this paper is the estimation of the still unknown ultrananocrystalline diamond nanoscale strength. In spite of its measured strength at the microscale, of -4 GPa, for a hypothetical nanowire with specified geometry (10×10×100 nm3) we have deduced a tremendously higher tensile strength, of -23 GPa, as well as a bending strength of -30 GPa. A fractal exponent of -2.5 and a Weibull modulus of -10 are also derived. Such results are shown to be compatible with a theoretical estimation of the ideal strength, deduced as -52 GPa by applying Quantized Fracture Mechanics, assuming the fracture quantum coincident with a grain size of -3 nm. Doped materials are also treated.

The nanoscale strength of ultra nano crystalline diamond / Pugno, Nicola. - In: REVIEWS ON ADVANCED MATERIALS SCIENCE. - ISSN 1606-5131. - 10:(2005), pp. 156-160. (Intervento presentato al convegno 2nd Int. Conf. on Nanomaterials and Nanotechnologies, NN2005 tenutosi a Crete (GRC) nel June 14-18, 2005).

The nanoscale strength of ultra nano crystalline diamond

PUGNO, Nicola
2005

Abstract

Aim of this paper is the estimation of the still unknown ultrananocrystalline diamond nanoscale strength. In spite of its measured strength at the microscale, of -4 GPa, for a hypothetical nanowire with specified geometry (10×10×100 nm3) we have deduced a tremendously higher tensile strength, of -23 GPa, as well as a bending strength of -30 GPa. A fractal exponent of -2.5 and a Weibull modulus of -10 are also derived. Such results are shown to be compatible with a theoretical estimation of the ideal strength, deduced as -52 GPa by applying Quantized Fracture Mechanics, assuming the fracture quantum coincident with a grain size of -3 nm. Doped materials are also treated.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1435084
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