Repetitive Nano-impact tests as a new tool to measure fracture toughness in brittle materials
Repetitive Nano-impact tests as a new tool to measure fracture toughness in brittle materials
Along this work, the feasibility of using repetitive-impact tests with a cube-corner tip and low loads for obtaining quantitative fracture toughness values will be shown. It will be displayed that the impacts are able to produce a cracking similar to the pattern developed for the classical fracture toughness tests in structural ceramics. Moreover, it will be shown how it is possible to identify the crack geometry evolution from Palmqvist crack to half-penny crack with each new impact being able to study the proper evolution of fracture toughness in terms of different indentation models and as a function of the strain rate, ? ?. Fracture toughness values of Al2O3 descend from ~6.10 MPa?m (? ?=?10?^3 s^(-1)), to ~3.52 MPa?m (? ?=?10?^(-3) s^(-1)). These values correspond to those found in the literature for ?-Al2O3 demonstrating that the use of repetitive-nano-impact tests provides good reproducibility, high accuracy for reliable fracture toughness testing.
nano-indentation, repetitive-nano-impact test, high strain rate test, dynamic hardness, fracture toughness
3235-3243
Frutos, E.
8730c6ea-7f59-44b7-aa33-cfee57de8b25
Gonzalez-Carrasco, J.L.
1a1f4550-2c21-468d-8cce-b367b053511b
Polcar, T.
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Frutos, E.
8730c6ea-7f59-44b7-aa33-cfee57de8b25
Gonzalez-Carrasco, J.L.
1a1f4550-2c21-468d-8cce-b367b053511b
Polcar, T.
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Frutos, E., Gonzalez-Carrasco, J.L. and Polcar, T.
(2016)
Repetitive Nano-impact tests as a new tool to measure fracture toughness in brittle materials.
Journal of the European Ceramic Society, 36 (13), .
(doi:10.1016/j.jeurceramsoc.2016.04.026).
(In Press)
Abstract
Along this work, the feasibility of using repetitive-impact tests with a cube-corner tip and low loads for obtaining quantitative fracture toughness values will be shown. It will be displayed that the impacts are able to produce a cracking similar to the pattern developed for the classical fracture toughness tests in structural ceramics. Moreover, it will be shown how it is possible to identify the crack geometry evolution from Palmqvist crack to half-penny crack with each new impact being able to study the proper evolution of fracture toughness in terms of different indentation models and as a function of the strain rate, ? ?. Fracture toughness values of Al2O3 descend from ~6.10 MPa?m (? ?=?10?^3 s^(-1)), to ~3.52 MPa?m (? ?=?10?^(-3) s^(-1)). These values correspond to those found in the literature for ?-Al2O3 demonstrating that the use of repetitive-nano-impact tests provides good reproducibility, high accuracy for reliable fracture toughness testing.
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Accepted/In Press date: 18 April 2016
Keywords:
nano-indentation, repetitive-nano-impact test, high strain rate test, dynamic hardness, fracture toughness
Organisations:
nCATS Group
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Local EPrints ID: 393592
URI: http://eprints.soton.ac.uk/id/eprint/393592
ISSN: 0955-2219
PURE UUID: 58aadcfa-370e-4efd-9c90-dc87be915a8f
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Date deposited: 28 Apr 2016 15:04
Last modified: 15 Mar 2024 05:32
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Author:
E. Frutos
Author:
J.L. Gonzalez-Carrasco
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