Role of local curvature in grain boundary sliding in a deformed polycrystal

Моисеенко, Д. Д.; Панин, В. Е.; Елсукова, Т. Ф.

doi:10.1134/s1029959913040073

Cited by 20 publications

(25 citation statements)

References 11 publications

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“…Nevertheless, it was shown that the Stochastic Excitable Cellular Automata SECA method does not contradict the linear theory of elasticity and, moreover, the fundamental transfer equation (modified Turnbull equation) in the limiting case coincides with the classical Hooke's law [3]. The method also includes an explicit account of porosity and nanocrystalline structure of the material, and algorithms for calculating the local moments of forces and angular velocities of microrotations occurring in a structurally heterogeneous medium.…”

Section: Theoretical Proceduresmentioning

confidence: 99%

“…This theory has been successfully expanded within the physical mesomechanics framework [1,3,12]. The material within the multilevel approach of physical mesomechanics is considered as a set of structural elements in a 3D-crystalline and 2D-planar subsystems along which rotational wave flows of mass and energy transfer occur.…”

Section: Theoretical Proceduresmentioning

confidence: 99%

“…Of particular importance is the study of the local material response at the mesoscale level where stresses and strains are distributed very inhomogeneously. This is stress/strain heterogeneity is caused by a large number of interface/grain boundaries as well as by specific heterogeneous nucleation and storage of deformation defects [2][3][4][5][6][7][8]. Structural heterogeneities serve as preferred sites for plastic flow initiation, generation of lattice and boundary defects and discontinuities of various types [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

Моисеенко

Maruschak

Panin

et al. 2017

Metals

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Abstract:The paper deals with a theoretical and experimental study of the relationship between the microstructural parameters, mechanical properties, and impact deformation and fracture of steels using the example of 17Mn1Si pipe steel. A model for the behavior of a polycrystalline grain conglomerate under impact loading at different temperatures was proposed within a cellular automata framework. It was shown that the intensity of dissipation processes explicitly depends on temperature and these processes play an important role in stress relaxation at the boundaries of structural elements. The Experimental study reveals the relationship between pendulum impact test temperature and the deformation/fracture energy of the steel. The impact toughness was shown to decrease almost linearly with the decreasing test temperature, which agrees with the fractographic analysis data confirming the increase in the fraction of brittle fracture in this case. It was shown with the aid of the proposed model and numerical simulations that the use of the excitable cellular automata method and an explicit account of test temperature through the possibility of energy release at internal interfaces help to explain the experimentally observed features of impact failure at different temperatures.

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Section: Theoretical Proceduresmentioning

confidence: 99%

Section: Theoretical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

Моисеенко

Maruschak

Panin

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…As a simulation tool suitable to the purpose of this work, the method of excitable cellular automata (ECA) has been recently developed and validated by the authors [14][15][16]. It should be noticed that the proposed simulation approach is aimed primarily at studying the mesoscale mechanisms of local stress evolution during high-rate deformation processes such as fast crack growth under shock loading.…”

Section: Simulationmentioning

confidence: 99%

“…However, multiscale consideration of loaded solids might be performed within the physical mesomechanics approach applied to materials where structural levels of deformation and fracture are related to each other through the hierarchy of scales. In this approach, understanding of the significance of rotational modes of deformation appeared to be of crucial importance [3,[12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of notch shape on strain localization in steel under shock loading: Hybrid CA simulation

Моисеенко¹,

Maksimov²,

Panin³

et al. 2016

AIP Conference Proceedings

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Abstract.A hybrid discrete-continuum Excitable Cellular Automata (ECA) approach is proposed to study the vector character of the mass and energy transfer flows in a solid under high-rate loading. Based on the torsion energy calculations, the model of generation and accumulation of defect structures is proposed. Numerical simulations of uniaxial shock loading of specimens with three typical notch shapes are performed to validate the proposed approach. It is shown that stress relaxation occurs most effectively when the modulation of various components of the force moment takes place at various scales. This offers the possibility to reduce the stress concentration substantially by tailoring the materials microstructure.

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Numerical and Experimental Study of Strain Localization in Notched Specimens of a Ductile Steel on Meso‐ and Macroscales

et al. 2016

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The computational approach for modeling the deformation behavior and fracture of materials with stress concentrators is proposed on the basis of the cellular automata technique. Numerical simulations performed on miniaturized specimens under dynamic loading are accompanied by laboratory tensile testing under quasi-static conditions applied to the specimens of a ductile structural steel with three typical notch shapes. Using in situ acoustic emission paired with digital image correlation techniques, it is shown that the notch shape exerts a very strong influence on the development of localized plastic flow and crack initiation ahead of the notch tip. It is concluded that the stress release occurs most effectively when the modulation of various components of the force moment takes place on mesoscopic scale.

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Role of local curvature in grain boundary sliding in a deformed polycrystal

Cited by 20 publications

References 11 publications

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

Effect of notch shape on strain localization in steel under shock loading: Hybrid CA simulation

Numerical and Experimental Study of Strain Localization in Notched Specimens of a Ductile Steel on Meso‐ and Macroscales

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