Evolution of Microscopic Cracks and Pores in Solids under Loading

Бетехтин, В. И.; Кадомцев, А. Г.

doi:10.1134/1.1924839

Cited by 40 publications

(21 citation statements)

References 6 publications

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“…It should be noted also that the characteristic dimensions a of light scatterers that we previously observed using Rayleigh scattering in glass of deteriorating turquoise beads (they are estimated as a=150 nm [13]), the number density of which grows with the rising glass corrosion degree, coincide with the sizes of nucleating microdiscontinuities that, according to [40], are typical defects emerging due to the aforementioned process at locations of shear and rotational strains. We presumably identify the observed light scatterers with this type of defects.…”

Section: Brief Discussionmentioning

confidence: 65%

“…We presumably identify the observed light scatterers with this type of defects. The material destruction related to formation and growth of such microscopic defects is a kinetic thermal fluctuation process occurring throughout the entire period of material loading [40], which lasts in the case of glass beads under the study for more than a hundred years. The merger of the micro-discontinuities and the formation of microcracks and then macrocracks is the only possible final phase of this process that ends by glass fracturing and bead fragmenting.…”

Section: Brief Discussionmentioning

confidence: 99%

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Glass depolymerization in the process of long-term corrosion: A study of deteriorating semiopaque turquoise glass beads using micro-FTIR spectroscopy

Kadikova

Морозова

Yuryeva

et al. 2020

Mater. Res. Express

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Nowadays, a problem of historical beadworks conservation in museum collections is actual more than ever because of fatal corrosion of the 19th century glass beads. Study of the beads at different stages of glass corrosion using FTIR was carried out in the attenuated total reflection mode in the range from 200 to 4000 cm −1 . We have observed glass depolymerization in the degraded beads, which is exhibited in domination of the band peaked at ∼1000 cm −1 . We conclude that the simplification of the glass structure during its long-term degradation at room temperature may be explained within the thermalfluctuation theory of materials fracture. We consider glass depolymerization, caused by the internal stress and decreasing the glass strength, as an essential corrosion mechanism of strongly stressed glass. We have also revealed shifts of two major absorption bands to low-frequency range (∼1000 and ∼775 cm −1 ) compared to ones typical for amorphous SiO 2 (∼1100 and 800 cm −1 , respectively) connected with Pb 2+ and K + appending to the glass network. The presence of a weak band at ∼1630 cm −1 in all the spectra is attributed to the adsorption of H 2 O. After annealing of the beads, the latter band disappeared completely in less deteriorated samples and significantly weakened in more degraded ones. Based on that we conclude that there is molecular water adsorbed on the beads. However, products of corrosion (e.g., alkali in the form of white crystals or droplets of liquid alkali) were not observed on the surface.

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Section: Brief Discussionmentioning

confidence: 65%

Section: Brief Discussionmentioning

confidence: 99%

Glass depolymerization in the process of long-term corrosion: A study of deteriorating semiopaque turquoise glass beads using micro-FTIR spectroscopy

Kadikova

Морозова

Yuryeva

et al. 2020

Mater. Res. Express

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“…At the same time, the evolution of pores into crack-shaped features, accompanied with the expansion of the dense layer, could be explained on the basis of the known phenomena of pore shape fluctuation and pore healing, which occur in loaded crystalline solids. In particular, there is a well-known effect of evolution of pores into quasi two-dimensional objects (flaws or microcracks) [18,19]. Therefore, the observed changes in the PSC structure after the growth may be considered as an evidence of growth stress partitioning between the GaN film and the PSC layer.…”

Section: Epitaxial Growth and Its Effect On The Structure Of The Psc mentioning

confidence: 95%

HVPE GaN growth on porous SiC with closed surface porosity

Mynbaeva

Ситникова

Tregubova

et al. 2007

Journal of Crystal Growth

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“…Nucleation of fractures is a complex process both controlled by the repartition of flaws in matter (pores, grain boundaries, cleavage planes, etc.) [ Engelder , ; Tapponnier and Brace , ] and by mechanical controls that make nuclei active or not [ Betekhtin and Kadomtsev , ; Ingraffea , ; Knauss , ]. This results in a microcrack damaging that eventually leads to the formation of faults or joints [ Ashby and Sammis , ; Kranz , ; Reches and Lockner , ; Segall and Pollard , ].…”

Section: The Complete Model Of Fracture Formation: Nucleation Growthmentioning

confidence: 99%

A model of fracture nucleation, growth and arrest, and consequences for fracture density and scaling

2013

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[1] In order to improve discrete fracture network (DFN) models, which are increasingly required into groundwater and rock mechanics applications, we propose a new DFN modeling based on the evolution of fracture network formation-nucleation, growth, and arrest-with simplified mechanical rules. The central idea of the model relies on the mechanical role played by large fractures in stopping the growth of smaller ones. The modeling framework combines, in a time-wise approach, fracture nucleation, growth, and arrest. It yields two main regimes. Below a certain critical scale, the density distribution of fracture sizes is a power law with a scaling exponent directly derived from the growth law and nuclei properties; above the critical scale, a quasi-universal self-similar regime establishes with a self-similar scaling. The density term of the dense regime is related to the details of arrest rule and to the orientation distribution of the fractures. The DFN model, so defined, is fully consistent with field cases former studied. Unlike more usual stochastic DFN models, ours is based on a simplified description of fracture interactions, which eventually reproduces the multiscale self-similar fracture size distribution often observed and reported in the literature. The model is a potential significant step forward for further applications to groundwater flow and rock mechanical issues.Citation: Davy, P., R. Le Goc, and C. Darcel (2013), A model of fracture nucleation, growth and arrest, and consequences for fracture density and scaling,

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Evolution of Microscopic Cracks and Pores in Solids under Loading

Cited by 40 publications

References 6 publications

Glass depolymerization in the process of long-term corrosion: A study of deteriorating semiopaque turquoise glass beads using micro-FTIR spectroscopy

Glass depolymerization in the process of long-term corrosion: A study of deteriorating semiopaque turquoise glass beads using micro-FTIR spectroscopy

HVPE GaN growth on porous SiC with closed surface porosity

A model of fracture nucleation, growth and arrest, and consequences for fracture density and scaling

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