Analysis of the conditions for the existence of stable microcracks in an elastic stress field from a rotational-shear mesodefect

Kirikov, S. V.; Перевезенцев, В. Н.

doi:10.22226/2410-3535-2021-1-50-54

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…A dislocation-type concentrator is a dislocation that takes place at the junction of grain boundaries. The junction dislocation is an analogue of the lattice dislocation, but it is considered not as a part of the crystal lattice of an individual grain, but in conditional (virtual) constructs: the lattice of grain boundary shifts, the complete lattice of overlaps, and the lattice of coincident nodes of crystal grains forming the junction [41], [42]. Such concentrators play a defining role in the further evolution of the polycrystal, being responsible for local accommodation processes.…”

Section: Problem Statementmentioning

confidence: 99%

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

Suchikova,

Kovachov,

Lazarenko

et al. 2023

Latvian Journal of Physics and Technical Sciences

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The article is devoted to the study of the mechanism of nanopore formation in the junctions of polycrystal grains under the plastic deformation of a polycrystal due to the conservative sliding of lattice dislocations. A mechanism for the formation of a stress concentrator at the junction of the polycrystal grain boundaries is proposed. The possibility of relaxation of the stress state due to the formation of a junction nanopore is considered in the paper.

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Section: Problem Statementmentioning

confidence: 99%

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

Suchikova,

Kovachov,

Lazarenko

et al. 2023

Latvian Journal of Physics and Technical Sciences

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“…[129][130][131]. Other models for crack formation in the presence of disclinations included various aspects of disclination screening [132][133][134] and blocked deformation twins [135,136].…”

Section: Crack Nucleation At Disclinations Diffusion In An Elastic Field Of Disclinationsmentioning

confidence: 99%

Elasticity Boundary-Value Problems for Straight Wedge Disclinations. A Review on Methods and Results

Романов¹,

Kolesnikova²

2021

Rev Adv Mater Tech

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“…2à). Âûðàaeåíèÿ äëÿ êîìïîíåíò òåíçîðà óïðóãèõ ïîëåé íàïðÿaeåíèé äëÿ ðàññìàòðèâàåìîãî ìåçîäåôåêòà â ïðàâîñòîðîííåé äåêàðòîâîé ñèñòåìå êîîðäèíàò, íà÷àëî êîòîðîé ñîâïàäàåò ñ öåíòðîì ìåçîäåôåêòà, à îñü x íàïðàâëåíà âäîëü ïëå÷à ìåçîäåôåêòà, ïðèâåäåíû â [20]. Äàëåå ñäâèíåì ñèñòåìó êîîðäèíàò â òî÷êó ñ êîîðäèíàòàìè (a, 0) è ó÷òåì, ÷òî r << 2a, ñëåäîâàòåëüíî, x << 2a è y << 2a.…”

Section: ðàñ÷åò ïîëåé óïðóãèõ íàïðÿAeåíèé ôîðìèðóþùèõñÿ âáëèçè ñòûêà çåðåí îò îäèíî÷íîãî ïëàíàðíîãî ìåçîäåôåêòà è äèïîëÿ äèñêëèíàöèéunclassified

Analysis of Local Fields of Elastic Stress Generated by Rotational-Shear Mesodefects Near the Junctions of Grains

Kirikov

Pupynin

Svirina

2021

PSP

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The work is devoted to the study of the structure of the elastic stress field in the area of junctions of grain boundaries containing strain-induced rotational-shear mesodefects. The jumps in plastic distortion of grains when passing through grain boundaries create additional misorientations on them, the mismatch of which at the junctions of grains leads to the appearance of linear mesodefects of the rotational type – junction disclinations. Planar mesodefects of the shear type appear on the flat sections of the boundaries, which are plastic shears uniformly distributed along the boundaries. These mesodefects create spatially inhomogeneous elastic stress fields near the junctions and ledges of the grains. They increase during plastic deformation and, at sufficiently large value of strain, initiate the formation of a fragmented material structure. Rotational-shear mesodefects are also the cause of the nucleation and accumulation of microcracks at the stage of viscous fracture of polycrystalline solids. In this work, asymptotic formulas are obtained that make it possible to analyze the distribution and anisotropy of the internal stress field in the vicinity of the grain junction from rotational-shear mesodefects. It was found that the components of the stress field weakly depend (logarithmically) on the length of the grain boundaries formatting junction of the grains. It is shown that the screening disclination of the dipole leads to the appearance of an angular dependence of the diagonal components of the elastic stress tensor in the vicinity of the junctions and its contribution to the elastic field of the disclinations dipole is about 10–15%. The obtained asymptotic expressions can be used to study the kinetics of a dislocation ensemble and to analyze the conditions for the nucleation of microcracks in the vicinity of joints and ledges of grains.

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Analysis of the conditions for the existence of stable microcracks in an elastic stress field from a rotational-shear mesodefect

Cited by 9 publications

References 5 publications

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

Elasticity Boundary-Value Problems for Straight Wedge Disclinations. A Review on Methods and Results

Analysis of Local Fields of Elastic Stress Generated by Rotational-Shear Mesodefects Near the Junctions of Grains

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