Residual stress distributions around indentations and scratches in polycrystalline Al2O3 and Al2O3/SiC nanocomposites measured using fluorescence probes

Wu, Houzheng; Roberts, Steve; Derby, Brian

doi:10.1016/j.actamat.2007.09.014

Cited by 37 publications

(40 citation statements)

References 22 publications

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“…Such an approach has been used in the past by Pecorari et al [20], who modelled the effect of surface damage on Rayleigh wave velocity in brittle materials, and by Wu et al [21], who modelled the effects of residual stress. For simplicity, we also assume that this surface layer is of sufficient thickness that any influence of the bulk material can be ignored and that the elastic properties of this surface layer are isotropic.…”

Section: Discussionmentioning

confidence: 99%

The mechanical properties of float glass surfaces measured by nanoindentation and acoustic microscopy

Goodman¹,

Derby²

2011

Acta Materialia

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We have combined nanoindentation with measurements of Rayleigh wave velocity to determine the elastic properties of the surfaces of a commercial soda-lime float glass and found significant differences between the mechanical behaviour of the side in contact with the air and that in contact with tin. By using two measurement methods we have obtained the two independent elastic constants of glass (assuming surface isotropy and homogeneity). The air-side has a Young's modulus E = 81.3 ± 0.5 GPa and Poisson's ratio m = 0.22 ± 0.01, which is significantly different from the tin-side values of E = 79.6 ± 1.0 GPa and m = 0.187 ± 0.015. The Young's modulus of both surfaces is significantly greater than the bulk value reported by the manufacturer of 73 GPa and Poisson's ratio smaller than the reported value of 0.23. The tin-side, having a lower Young's modulus than the air-side, is in the opposite sense to the reported increase in stiffness of bulk float glass with increasing levels of tin doping. We critically review the possible mechanisms for the difference in mechanical properties between the tin-and air-sides of a float glass sheet and produce quantified predictions of likely changes from each mechanism. From this we conclude that no individual mechanism can account for the magnitude of the difference we have measured.

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Section: Discussionmentioning

confidence: 99%

The mechanical properties of float glass surfaces measured by nanoindentation and acoustic microscopy

Goodman¹,

Derby²

2011

Acta Materialia

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“…Raman peak profile analysis was used to calculate the characteristic crystallite size [22], compressive residual stress [19] and dislocation density [39] across sub-surface regions of the graphite samples. Further details on the models used in these calculations can be found elsewhere [19,22,39,40]. The crystallite size was determined based on the integrated area ratio between the D and G peak intensities, termed I D and I G respectively, using the following equation:…”

Section: Raman Mapping Area Spectroscopymentioning

confidence: 99%

“…It has been reported that the broadening of the Raman G-line in irradiated graphite corresponds with the dislocation population over the scanned volume and results from the strain field around dislocations [41]. In order to quantify the number of preexisting dislocations and those introduced during irradiation based on the broadening of the Raman G-peak, the model of Wu et al (2008) was adopted [39]. In this model, dislocation densities can be estimated based on the broadening of a characteristic peak in a spectroscopic line profile following the function:…”

Section: Raman Mapping Area Spectroscopymentioning

confidence: 99%

An understanding of lattice strain, defects and disorder in nuclear graphite

Krishna¹,

Wade²,

Jones³

et al. 2017

Carbon

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In this study, microstructural parameters, such as lattice dimension, micro-strain and dislocation density, of different neutron-irradiated graphite grades have been evaluated using the diffraction profiles of X-ray diffraction (XRD) and the scattering profiles of Raman spectroscopy. Using Gen-IV candidate graphite samples (grade PCEA, GrafTech), subjected to neutron irradiation at 900°C to 6.6 and 10.2 dpa, and graphite samples of similar grain size and microstructure taken from the core of the British Experimental Pile Zero reactor, which have been irradiated at 100-120 °C to 1.60 dpa, an investigation on the effect of irradiation dose and temperature on the aforementioned microstructural parameters is

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“…A comparative quantification of this data reveals a discernible increase of 6.8 cm -1 in the full width half maximum (FWHM). By adopting the model of Wu et al [18], we can convert this value into the dislocation density, in this case estimated at 4.02 × 10 14 m -2 .…”

Section: Resultsmentioning

confidence: 99%

Plastic deformation of polycrystalline alumina introduced by scaled-down drop-weight impacts

et al. 2016

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Residual stress distributions around indentations and scratches in polycrystalline Al2O3 and Al2O3/SiC nanocomposites measured using fluorescence probes

Cited by 37 publications

References 22 publications

The mechanical properties of float glass surfaces measured by nanoindentation and acoustic microscopy

The mechanical properties of float glass surfaces measured by nanoindentation and acoustic microscopy

An understanding of lattice strain, defects and disorder in nuclear graphite

Plastic deformation of polycrystalline alumina introduced by scaled-down drop-weight impacts

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