Plastic Strain Localization and Its Stages in Al-Mg Alloys

Tretyakova, T. V.; Wildemann, V. E.

doi:10.1134/s1029959918040057

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…The registration of strain distribution fields during plastic deformation of the samples was carried out with a Vic-3D Correlated Solutions non-contact three-dimensional optical system [19,20]. The use of two cameras located at a certain angle in the video system makes it possible to work not only with flat specimens, but also with cylindrical specimens, specimens of complex shape and structural elements.…”

Section: The Portevin-le Chatelier Effect During Tension-torsion Loadingmentioning

confidence: 99%

Experimental study of the Portevin-Le Chatelier effect under complex loading of Al-Mg alloy: procedure issues

Tretyakova

Tretyakov

Chechulina³

2021

Frattura Ed Integrità Strutturale

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The aim of this work is to solve the methodological issues of the experimental study of the nucleation and propagation of deformation bands due to the Portevin-Le Chatelier effect under conditions of complex loading. It is of interest to determine the boundaries of unstable plastic deformation of the AMg6 alloy under complex loading conditions. A technique for controlling the loading process with a given rate of deformation intensity of materials has been worked out. The results showed that short-term stops and unloading during loading influence on the value of critical deformation, at which the manifestation of the jerky flow begins. The evolution of inhomogeneous strain fields and local strain rates under conditions of manifestation of jerky flow during tension with torsion tests of Al-Mg alloy samples.

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Section: The Portevin-le Chatelier Effect During Tension-torsion Loadingmentioning

confidence: 99%

Experimental study of the Portevin-Le Chatelier effect under complex loading of Al-Mg alloy: procedure issues

Tretyakova

Tretyakov

Chechulina³

2021

Frattura Ed Integrità Strutturale

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“…Inelastic behavior and failure of critical structural elements are related to elastoplastic deformation of the material, accompanied by a change in its structure, physical and mechanical properties during loading. Some structural materials, for example, Al-Mg, Al-Cu, Ni-Cr, and Ni-Fe-Cr alloys, are characterized by the manifestation of the effects of discontinuous yield in certain ranges of temperatures and loading rates [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The loading system [13][14][15] plays a key role in the transition from the stage of equilibrium accumulation of damage to the nonequilibrium, avalanche-like stage of destruction. As the effects of the intermittent flow are characterized by instability of the ongoing deformation processes [1,6,10], we expect a significant dependence of this phenomenon on parameters of the loading system's stiffness.…”

Section: Introductionmentioning

confidence: 99%

Spatial-Time Inhomogeneity Due to the Portevin-Le Chatelier Effect Depending on Stiffness

Tretyakova

Tretyakov

2023

Metals

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This work is devoted to the study of the influence of the rigidity of the loading system on the kinetics of the initiation and propagation of the Portevin-Le Chatelier (PLC) strain bands due to the jerky flow in Al-Mg alloy. To estimate the influence of the loading system, the original loading attachment, which allows reducing the stiffness in a given range, was used. Registration of displacement and strain fields on the specimen surface was carried out with the Vic-3D non-contacting deformation measurement system based on the Digital Image Correlation (DIC) technique. The mechanical uniaxial tension tests were carried out using samples of Al-Mg alloy at the biaxial servo-hydraulic testing system Instron 8850. As a result of tensile tests, deformation diagrams were obtained for Al-Mg alloy samples tested at different values of stiffness of the loading system: 120 MN/m (nominal value), 50 MN/m, 18 MN/m, and 5 MN/m. All diagrams show discontinuous plastic deformations (the Portevin-Le Chatelier effect). It is noted that a decrease in the rigidity of the loading system leads to a change in the type of jerky flow. At constant parameters of the loading rate, temperature, and chemical composition of the material, the PLC effects of types A, B, and C are recorded in tests.

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“…Методы изучения полей перемещений и деформаций с применением метода корреляции цифровых изображений (Digital Image Correlation -DIC) получили широкое распространение [4][5][6][7]. Для изучения локализации пластической деформации использована система неинвазивного измерения формы и деформаций StrainMaster, которая позволила определить поля перемещений и деформаций как при статическом, так и при динамическом нагружении.…”

Section: Introductionunclassified

A study of plastic strain localization under static and dynamic loading using the StrainMaster non-invasive strain measurement system

Sokovikov¹

2021

Bulletin of Perm University. Physics

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Static and dynamic testing of specimens specially designed for studying the localization of plastic deformation in AMg6 and D16 alloys were performed on then electromechanical Testometric machine and split Hopkinson pressure bar using the StrainMaster system for noninvasive measurement of shape and deformation. Displacement and strain fields are plotted for special-shaped specimens of AMg6 and D16 alloys subjected to static deformation and dynamic loading. Comparison between the experimentally obtained strain fields and the results of numerical simulation made with account of the kinetics of microdefect accumulation in the examined material demonstrates good agreement to the accuracy of ~20%. The performed tests and their numerical simulation with consideration for the evolution of the defect material structure confirm the concept of the strain localization mechanism associated with the processes in the system of microdefects.

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Plastic Strain Localization and Its Stages in Al-Mg Alloys

Cited by 12 publications

References 8 publications

Experimental study of the Portevin-Le Chatelier effect under complex loading of Al-Mg alloy: procedure issues

Experimental study of the Portevin-Le Chatelier effect under complex loading of Al-Mg alloy: procedure issues

Spatial-Time Inhomogeneity Due to the Portevin-Le Chatelier Effect Depending on Stiffness

A study of plastic strain localization under static and dynamic loading using the StrainMaster non-invasive strain measurement system

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