The kinetic nature of the strength of solids

Regel, V. R.; Slutsker, A. I.; Tomashevskii, É.E.

doi:10.3367/ufnr.0106.197202a.0193

Cited by 122 publications

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“…The strength of a solid obtained like this is called the theoretical strength of a solid. The actual strength of solids is much less (by 1 to 2 orders of magnitude) than that theoretical one predicted by crystal lattice theory [5,6]. The physics of strength approach is justified in this paper because the mechanical failure energy U 0 is found to coincide with the sublimation energy Q, i. e., the interatomic binding energy [5,6], (see Table).…”

Section: Theorymentioning

confidence: 95%

“…It has been proven in the works of S.N. Zhurkov and his workers [5][6][7][8] and references therein.…”

Section: Theorymentioning

confidence: 95%

“…This fluctuating thermal pressure stretches the interatomic bonds and contributes to their deformation and rupture caused by the external load. An estimate of the thermal fluctuation stress σ T,τ shows that it is large [5,6]. For instance, the theoretical strength of aluminum is 10 7 kPa, the thermal fluctuation stress σ T,τ = 9.9 · 10 6 kPa, the actual strength σ * = 10 5 kPa.…”

Section: Theorymentioning

confidence: 99%

“…The intermolecular distances increase but the The mechanical failure energy U 0 and the sublimation energy Q for some substances [5,6] …”

Section: Theorymentioning

confidence: 99%

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Iodine Is a Covalent Crystal

Stepanov

2005

Phys. Solid State

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Section: Theorymentioning

confidence: 95%

“…It has been proven in the works of S.N. Zhurkov and his workers [5][6][7][8] and references therein.…”

Section: Theorymentioning

confidence: 95%

Section: Theorymentioning

confidence: 99%

“…The intermolecular distances increase but the The mechanical failure energy U 0 and the sublimation energy Q for some substances [5,6] …”

Section: Theorymentioning

confidence: 99%

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Iodine Is a Covalent Crystal

Stepanov

2005

Phys. Solid State

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“…The diffraction techniques (Regel', Slutsker & Tomashevskii, 1974, Kraus at al., 1993, Schors at al., 2006 give precious few information on the nucleation and development of the microcrack ensemble with the exception of the fact that these ensembles are formed quite rapidly (say, in creep mode), and then their further evolution becomes, really, exhausted. As a rule, it is postulated that even the cracks of such a scale can be regarded a priori as conventional stress concentrators (Arias et al, 2003, Bouchbinder at al., 2004, Nasseri at al., 2006; to our best knowledge, the latter postulate was not confirmed experimentally.…”

mentioning

confidence: 99%

Delayed Fracturing: Acoustic Emission Analysis of Nucleation and Transformation of an Ensemble of Mesoscopic Cracks in Deforming Heterogeneous Materials

Leksovskii¹

2012

Acoustic Emission

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Acoustic emission is accompanied by many physical processes and phenomena, including discrete structural changes in solids during deformation. Information about these processes is very important for determination of the resource strength and durability of elements of machines and constructions in order to monitor and prevent technogenic catastrophes. Submitted experimental results demonstrate the unique capabilities of acoustic emission method in the analysis of nucleation and transformation of an ensemble of micro and mesocracks. This allows us to formulate adequate, physically based models of the process of material damage in the course of its operation.A lot of conventional engineering materials, such as polymers, metals, composites, as well as coarsely heterogeneous materials (rocks, concrete etc.), response on the applied deformation through the nucleation of microscopic and mesoscopic cracks. Such cracks could appear in a short time after the load application, and so cracked material might work a long time. Under condition of long term operation under loading, these cracks in many cases allow one to use a concept of damaging that is deterioration of physical and mechanical properties. There is very limited information on the nucleation and transformation of the crack ensemble up to now. How far and under which conditions do cracks of micro and mesoscopic size determine altogether the performance of material and the critical state of loaded body? Our study is to elucidate the real properties of both individual mesocracks and the ensemble of such cracks.The cracks of micro and meso scale play, far and away, the role of indicators of local critical state of structure. These defects, which, undoubtedly, accumulate in a solid under the action of mechanical stress, are regarded as damages. A lot of microscopic studies of metals evidence (Botvina, 2008, among many others) that cracks of meso scale are presented in multitude in vicinity of stress concentrators, in localities of heterogeneous development of inelastic deformation. And the ensembles of such cracks, what is their role? The ensemble/cluster of cracks is an entity that gives rise to the probability of the

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Kinetic Nature of the Process of Microindentation into Alkali Halide Crystals

Kats

Regel

Boyarskaya

et al. 1974

Cryst Res and Technol

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The investigation of the dependence of indentor intrusion depth on the time of load application and temperature for the alkali‐halide crystals KCl, LiF, NaCl has been carried out. The dependence of indentor intrusion velocity logarithm lg ḣ in microhardness H appears to be linear in the investigated interval of loading times and temperatures. The data obtained may prove the thermofluctuational character of the microindentation process. — The activation energy of microindentation process almost coincides with the activation energies of the sublimation process.

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The kinetic nature of the strength of solids

Cited by 122 publications

References 0 publications

Iodine Is a Covalent Crystal

Iodine Is a Covalent Crystal

Delayed Fracturing: Acoustic Emission Analysis of Nucleation and Transformation of an Ensemble of Mesoscopic Cracks in Deforming Heterogeneous Materials

Kinetic Nature of the Process of Microindentation into Alkali Halide Crystals

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