Journal article
Brazilian disk test and digital image correlation: a methodology for the mechanical characterization of brittle materials
Materials and structures, Vol.51(1), pp.1-17
02/2018
DOI: 10.1617/s11527-018-1145-8
Abstract
In this paper, an optimized and reliable approach for the evaluation of the mechanical properties of brittle materials is proposed and applied to the characterization of geopolymer mortars. In particular, the Young’s modulus, the Poisson’s ratio and the tensile strength are obtained by means of a Brazilian disk test combined with the digital image correlation (DIC) technique. The mechanical elastic properties are evaluated by a special routine, based on an over-deterministic method and the least square regression, that allows to fit the displacement fields experienced by the samples during the experiment. Error sources, like center of the disk location and rigid-body motion components, were analyzed and estimated automatically with the proposed procedure in order to perform an accurate evaluation of the elastic constants. The strain field measured by DIC and the computed elastic properties were then used to perform a local stresses analysis. This latter was exploited to investigate the failure mechanisms and to evaluate the tensile strength of the investigated material and the obtained data were compared with those predicted by the ASTM and ISMR standards. Three different loading platens (flat, rod and curved) were adopted for the Brazilian test in order to evaluate their effect on the elastic properties calculation, on the failure mechanisms and tensile strength evaluation. Results reveal that the curve platens are the most suitable for the tensile strength calculation, whereas the elastic properties did not show any influence from the loading configuration. Furthermore, the proposed procedure, of easy implementation, allows to accurately calculate Young’s modulus, Poisson’s ratio and the tensile strength of brittle materials in a single experiment.
Details
- Title: Subtitle
- Brazilian disk test and digital image correlation: a methodology for the mechanical characterization of brittle materials
- Creators
- E Sgambitterra - 0000 0004 1937 0319 grid.7778.f Department of Mechanical, Energy and Management Engineering - DIMEG University of Calabria Ponte P. Bucci, cubo 44C 87030 Arcavacata di Rende CS ItalyC Lamuta - 0000 0004 1936 9991 grid.35403.31 Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL 61801 USAS Candamano - 0000 0004 1937 0319 grid.7778.f Department of Environmental and Chemical Engineering - DIATIC University of Calabria Ponte P. Bucci, cubo 44A 87030 Arcavacata di Rende CS ItalyL Pagnotta - 0000 0004 1937 0319 grid.7778.f Department of Mechanical, Energy and Management Engineering - DIMEG University of Calabria Ponte P. Bucci, cubo 44C 87030 Arcavacata di Rende CS Italy
- Resource Type
- Journal article
- Publication Details
- Materials and structures, Vol.51(1), pp.1-17
- Publisher
- Springer Netherlands; Dordrecht
- DOI
- 10.1617/s11527-018-1145-8
- ISSN
- 1359-5997
- eISSN
- 1871-6873
- Language
- English
- Date published
- 02/2018
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064101502771
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