EXPERIMENTAL AND THEORETICAL INVESTIGATIONS OF STRUCTURAL MECHANISMS AND PLASTIC STRAIN LOCALIZATION EFFECTS IN ALMG6 ALLOY UNDER DYNAMIC LOADING

M.A. Sokovikov, M.Yu. Simonov, V.V. Chudinov, S.V. Uvarov, V.A.Oborin, O.B. Naimark

Author details

M.A. Sokovikov
Institute of Continuous Media Mechanics, Perm, Russian Federation
M.Yu. Simonov
Perm National Research Polytechnic University, Perm, Russian Federation
V.V. Chudinov
Institute of Continuous Media Mechanics, Perm, Russian Federation
S.V. Uvarov
Institute of Continuous Media Mechanics, Perm, Russian Federation
V.A.Oborin
Institute of Continuous Media Mechanics, Perm, Russian Federation
O.B. Naimark
Institute of Continuous Media Mechanics, Perm, Russian Federation

https://doi.org/10.15593/perm.tech/2023.4.11

This paper is concerned with substantiating one of the mechanisms of plastic strain localization under high rate loading associated with structural transitions in the defect structure of materials. For this purpose, a series of experiments were carried out to study the localization of plastic strain in skewed specimens of the AM6 alloy subjected to loading in a split Hopkinson pressure bar. The temperature fields generated during the plastic deformation tests designed to identify the characteristic stages of strain localization were investigated "in-situ" using a high-speed infrared camera CEDIP Silver 450M. The values of temperatures in the strain localization zone indicate that in the AMg6 alloy under the implemented loading conditions the mechanism of strain localization caused by thermoplastic instability is not realized. Structure analysis of dynamically loaded specimens was carried out using the Olympus GX- 51 optical microscope and FEI PHENOM G2 ProX scanning electron microscope. It supports the structure-dependent regularities of the strain localization mechanism under dynamic loading. The experimental results of dynamic loading with a subsequent investigation of the temperature fields, the structural studies with an optical and electron microscope, as well as the data of the numerical modeling considering the kinetics of the mesodefect accumulation in the material suggest that one of the mechanisms of plastic strain localization in the AMg6 alloy under realized loading conditions is caused by structural transitions in the defect structure of the material.

Keywords

dynamic loadingplastic strain localizationinfrared thermographysimulationstructural studies.

ЭКСПЕРИМЕНТАЛЬНОЕ И ТЕОРЕТИЧЕСКОЕ ИССЛЕДОВАНИЕ СТРУКТУРНЫХ МЕХАНИЗМОВ И ЭФФЕКТОВ ЛОКАЛИЗАЦИИ ПЛАСТИЧЕСКОЙ ДЕФОРМАЦИИ В СПЛАВЕ АМГ6 ПРИ ДИНАМИЧЕСКОМ НАГРУЖЕНИИ

Обосновывается один из механизмов локализации пластической деформации при высокоскоростном нагружении, связанном со структурными переходами в дефектной структуре материалов. Для этого проводились эксперименты по изучению локализации пластической деформации в скошенных образцах из сплава АМг6 при нагружении на стержне Гопкинсона – Кольского. Температурные поля при пластическом деформировании с целью идентификации характерных стадий локализации деформации исследовались in situ с использованием высокоскоростной инфракрасной камеры CEDIP Silver 450M. Значения температур в зоне локализации свидетельствуют, что механизм локализации деформации, обусловленный термопластической неустойчивостью в осуществленных условиях нагружения, для сплава АМг6 не реализуется. Проведены структурные исследования динамически нагруженных образцов на оптическом микроскопе Olympus GX-51 и сканирующем электронном микроскопе FEI PHENOM G2 ProX, подтверждающие структурную обусловленные закономерности механизма локализации деформации при динамическом нагружении. Результаты экспериментальных исследований по динамическому нагружению с изучением температурных полей, структурные исследования с применением оптического и электронного микроскопов, а также данные численного моделирования, проведенного с учетом особенностей кинетики накопления мезодефектов в материале, позволяют предполагать, что один из механизмов локализации пластической деформации при реализованных условиях нагружении в сплаве АМг6 обусловлен структурными переходами в дефектной структуре материала.

Ключевые слова

динамическое нагружениелокализация пластической деформацииинфракрасное сканированиечисленное моделированиеструктурные исследования.

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4.Molinari A. Instabilité thermoviscoplastique en cisaillement simple // J. Mec. Theor. Appl. – 1985. – Vol. 4, no. 5. – P. 659–684. Scholar
5.Molinari A. Shear band analysis // Solid State Phenom. – 1988. – Vol. 3–4. – P. 447–467. Scholar
6.Molinari A. Collective behavior and spacing of adiabatic shear bands // J. Mech. Phys. Solids. – 1997. – Vol. 45, no. 9. – P. 1551–1575. DOI: 10.1016/S0022-5096(97)00012-4 Scholar
7.Molinari A., Clifton R. Localisation de la déformation viscoplastique en cisaillement simple, résultats exacts en théorie non-linéaire // C.R. Acad. Sci. – 1983. – Vol. 2, no. 296. – P. 1–4. Scholar
8.Wright T.W. Shear band susceptibility: work hardening materials // Int. J. Plast. – 1992. – Vol. 8. – P. 583–602. DOI: 10.1016/0749-6419(92)90032-8 Scholar
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11.Zhou F., Wright T.W., Ramesh K.T. The formation of multiple adiabatic shear bands // J. Mech. Phys. Solids. – 2006. – Vol. 54, no. 7. – P. 1376–1400. DOI: 10.1016/j.jmps.2006.01.006 Scholar
12.Yang Y., Zeng Y., Gao Z.W. Numerical and experimental studies of self-organization of shear bands in 7075 aluminum alloy // Mater. Sci. Eng. – 2008. – Vol. A 496. – P. 291–302. Scholar
13.McDowell D.L. A perspective on trends in multiscale plasticity // Int. J. Plast. – 2010. – Vol. 26, no. 9. – P. 1280–1309. DOI: 10.1016/j.ijplas.2010.02.008 Scholar
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Article information

Published: 5 October 2023
Issue date: 5 October 2023
Issue: No. 4 (2023)