Nonequilibrium transitions in ensembles of defects attributed to dynamic localization of plastic deformation

Sokovikov, Mikhail; Bilalov, Dmitry; Chudinov, Vasiliy; Uvarov, Sergey; Plekhov, O.; Terekhina, A. I.; Naimark, Oleg

doi:10.1134/s1063785014120128

Cited by 21 publications

(8 citation statements)

References 4 publications

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“…Для изучения процессов локализации пластической деформации в режиме близком к чистому сдвигу при различных скоростях нагружения были разработаны и запатентованы образцы специальной формы (П-образные) и оснастка, обеспечивающие реализацию плоского деформированного состояния [10][11][12].…”

Section: экспериментальные исследованияunclassified

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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Section: экспериментальные исследованияunclassified

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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“…При высокоскоростном взаимодействии ударника с мишенью реализуется разрушение в виде формирования и выноса пробки. Для исследования распределения пластических деформаций на тыльной поверхности мишени в процессе формирования и выноса пробки использовалась инфракрасная камера CEDIP Silver 450M [6,7].…”

Section: экспериментальные исследованияunclassified

“…Изучение процесса локализации пластической деформации при высоких скоростях нагружения с помощью методов инфракрасного сканирования проводилось рядом авторов [1][2][3][4][5][6][7].…”

Section: Introductionunclassified

The study of plastic strain and fracture localization under dynamic loading using infrared thermography technique

Sokovikov¹

2018

Вестн. ПГУ. Физика

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“…The velocity, at which the projectile strikes the target, is 120m/s. The maximum temperature at the hole periphery is 62°C, [7]. Fig.7 represents an infrared picture illustrating the back surface of the target in the process of plug formation.…”

Section: Experimental Studymentioning

confidence: 99%

Structural mechanisms of formation of adiabatic shear bands

Sokovikov¹,

Bilalov²,

Oborin³

et al. 2016

Frattura Ed Integrità Strutturale

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The paper focuses on the experimental and theoretical study of plastic deformation instability and localization in materials subjected to dynamic loading and high-velocity perforation. We investigate the behavior of samples dynamically loaded during Hopkinson-Kolsky pressure bar tests in a regime close to simple shear conditions. Experiments were carried out using samples of a special shape and appropriate test rigging, which allowed us to realize a plane strain state. Also, the shear-compression specimens proposed in were investigated. The lateral surface of the samples was investigated in a real-time mode with the aid of a high-speed infra-red camera CEDIP Silver 450M. The temperature field distribution obtained at different time made it possible to trace the evolution of plastic strain localization. Use of a transmission electron microscope for studying the surface of samples showed that in the regions of strain localization there are parts taking the shape of bands and honeycomb structure in the deformed layer. The process of target perforation involving plug formation and ejection was investigated using a high-speed infra-red camera. A specially designed ballistic set-up for studying perforation was used to test samples in different impulse loading regimes followed by plastic flow instability and plug ejection. Changes in the velocity of the rear surface at different time of plug ejection were analyzed by Doppler interferometry techniques. The microstructure of tested samples was analyzed using an optical interferometer-profilometer and a scanning electron microscope. The subsequent processing of 3D deformation relief data enabled estimation of the distribution of plastic strain gradients at different time of plug formation and ejection. It has been found that in strain localization areas the subgrains are elongated taking the shape of bands and undergo fragmentation leading to the formation of super-microcrystalline structure, in which the size of grains is ~300nm. Rotational deformation modes give rise to the high angular disorientations of grains. The development of plastic shear instability regions has been simulated numerically. For this purpose, we use a recently developed theory, in which the influence of microshears on the deformation properties of materials has Citation: Sokovikov, M., Bilalov, D., Oborin, V., Chudinov, V., Uvarov, S., Bayandin, Y., Naimark, O., Structural mechanisms of formation of adiabatic shear bands, Frattura ed Integrità Strutturale, 38 (2016) 296-304.

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Nonequilibrium transitions in ensembles of defects attributed to dynamic localization of plastic deformation

Cited by 21 publications

References 4 publications

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

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

The study of plastic strain and fracture localization under dynamic loading using infrared thermography technique

Structural mechanisms of formation of adiabatic shear bands

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