Nonlinear wave processes of crack propagation in brittle and brittle-ductile fracture

Панин, В. Е.; Егорушкин, В. Е.; Derevyagina, L. S.; Deryugin, Е. Е.

doi:10.1134/s1029959913030016

Cited by 20 publications

(8 citation statements)

References 4 publications

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“…To analyse and rationalise the results, we employ physical mesomechanics, which is a concept considering the deformation process in a harmony with the hierarchy of scales where plastic deformation occurs self‐consistently …”

Section: Numerical Experiments Discussion and Consolidation Of Expermentioning

confidence: 99%

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

Panin

Maruschak

Власов

et al. 2017

Fatigue Fract Eng Mat Struct

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The fracture energy of 12Cr1MoV steel specimen with V‐shaped, U‐shaped and I‐shaped notches under impact loading was measured and analysed. The results were described using three common approaches to ductile‐brittle fracture: force‐based, energy‐based and strain‐based. Within the stage‐wise approach of physical mesomechanics of materials, the rate of increase/decrease of load at the stage of initiation and propagation of a macroscopic defect was evaluated, providing a good correlation with the work of fracture. The excitable cellular automata technique was applied to simulate the deformational behaviour of the specimens with different shape of notches. It was demonstrated that in the case of the blunted notch, the maximum impact toughness is facilitated by a more uniform distribution of the load along the notch, which hinders brittle fracture at lower testing temperature. For the specimen with the sharp I‐notch, the bands of localised shear are oriented normally to the loading axis, inhibiting macroscopic localisation of strain and crack propagation. For this reason, the impact toughness of the specimen with the I‐notch appeared to be higher than that of the V‐notched one. Using the fractographic analysis and the size of shear lips as a quantitative fracture parameter, a physical‐mechanistic scheme of fracture was suggested for the case of enhanced localised plasticity near the stress riser.

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Section: Numerical Experiments Discussion and Consolidation Of Expermentioning

confidence: 99%

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

Panin

Maruschak

Власов

et al. 2017

Fatigue Fract Eng Mat Struct

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show abstract

“…However, the appearance of lattice curvature zones and of nanoscale mesoscopic structural states at the lattice curvature interstices radically changes the mechanisms of plastic deformation and fracture of solids. This concerns the effect of plastic distortion [11], formation of a vortical filamentary mesosubstructure [9,12], structural turbulence, and dynamic rotations [2,10,13]. Structural turbulence of plastic flow was predicted when modeling grain-boundary sliding by the excitable cellular automaton method for grain boundaries that lack translational invariance [17].…”

Section: Structural Turbulence Of Plastic Flow At Lattice Curvature Amentioning

confidence: 99%

Influence of Lattice Curvature and Nanoscale Mesoscopic Structural States on the Wear Resistance and Fatigue Life of Austenitic Steel

Панин

Егорушкин

Surikova

2020

Springer Tracts in Mechanical Engineering

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The gauge dynamic theory of defects in a heterogeneous medium predicts the nonlinearity of plastic flow at low lattice curvatureand structural turbulence with the formation of individual dynamic rotations at high curvature of the deformed medium. The present work is devoted to the experimental verification of the theoretical predictions. Experimentally studied are the influence of high-temperature radial shear rolling and subsequent cold rolling on the internal structure of metastable Fe–Cr–Mn austenitic stainless steel, formation of nonequilibrium ε- and α′-martensite phases, appearance of dynamic rotations on fracture surfaces, fatigue life in alternating bending, and wear resistance of the material. Scratch testing reveals a strong increase in the damping effect in the formed hierarchical mesosubstructure. The latter is responsible for a nanocrystalline grain structure in the material, hcp ε martensite and bcc α′ martensite in grains, a vortical filamentary substructure on the fracture surface as well as for improved high-cycle fatigue and wear resistance of the material. This is related to a high concentration of nanoscale mesoscopic structural states, which arise in lattice curvature zones during high-temperature radial shear rolling combined with smooth-roll cold rolling. These effects are explained by the self-consistent mechanical behavior of hcp ε-martensite laths in fcc austenite grains and bcc α′-martensite laths that form during cold rolling of the steel subjected to high-temperature radial shear rolling.

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“…It is known that the kinetics of fatigue failure is controlled by processes of structural damage accumulation and the development of cyclic plastic deformation, whose scale levels depend on the composition, structural state, degree of heterogeneity and resource of the mate-rial ductility (Elsukova, Panin 1996;Panin et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…There are several theoretical approaches to interpretation of deformation processes of polycrystalline materials. The concept of multi-level descriptions con-siders a solid as a hierarchically organized system (Elsukova, Panin 1996;Panin et al 2013;Chausov et al 2015), which is the most dynamically developed. It allows not only establishing the structural levels of material deformation but also to develop a series of physical-mathematical approaches to forecast the integrity of materials and structures.…”

Section: Introductionmentioning

confidence: 99%

Structural Levels of the Nucleation and Growth of Fatigue Crack in 17mn1si Steel Pipeline After Long-Term Service

et al. 2015

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The majority of modern gas pipelines in Ukraine, Lithuania and Russia have been operating for more than 30–40 years. The problem of forecasting residual life-time of materials comprising such gas pipelines calls for study of their degradation kinetics as well as requires to determine its relationship with the strain-force loading parameters. The aim of the paper is to study the kinetics of fracture in order to range mechanisms of cyclic deformation of 17Mn1Si steel at nucleation and growth of a fatigue crack. Flat specimens were cut out from a fragment of 17Mn1Si steel pipe after 40 years of service. Microstructures of specimens were examined. In the paper, an attempt was made to apply the combined approach to study of deformation and fracture based on the following research parameters from nonlinear fracture mechanics: physical mesomechanics and numerical fractography.

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Nonlinear wave processes of crack propagation in brittle and brittle-ductile fracture

Cited by 20 publications

References 4 publications

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

Influence of Lattice Curvature and Nanoscale Mesoscopic Structural States on the Wear Resistance and Fatigue Life of Austenitic Steel

Structural Levels of the Nucleation and Growth of Fatigue Crack in 17mn1si Steel Pipeline After Long-Term Service

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