Time-resolved deformation measurements of the Portevin–Le Chatelier bands

Xiang, Guo; Zhang, Qingchuan; Liu, H.W.; Wu, Xiaoping; Ju, Xu

doi:10.1016/j.scriptamat.2006.08.049

Cited by 65 publications

(39 citation statements)

References 11 publications

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“…Как видно из рисунка, пластическая деформация локализуется сначала в виде зародыша деформационной полосы, который возникает на одном из ребер образца (кадр I). Этот зародыш полосы в форме узкого клина деформированного материала затем растет в объем образца под некоторым углом к оси растяжения в течение 3−10 ms, что качественно согласуется с ростом зародыша полосы ПЛШ типа В в сплавах систем Al−Cu и Al−Mg, деформируемых в жесткой испытательной машине [38][39][40][41].…”

Section: рис 3 зависимость ψMax (Umax)unclassified

Исследование Механизма Низкочастотной Дискретной Акустической Эмиссии В Ходе Прерывистой Ползучести Алюминиевого Сплава

Шибков¹,

Желтов²,

Гасанов³

et al. 2017

Физика Твердого Тела

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Исследована корреляция между динамикой деформационных полос и дискретной акустической эмиссией в ходе прерывистой ползучести сплава АМг6 с помощью высокоскоростной видеосъемки с временным разрешением до 50 mus. Триггером макроскопической деформационной ступени на кривой ползучести является зарождение и расширение первичной полосы деформации, которая генерирует характерный сигнал акустической эмиссии длительностью порядка нескольких миллисекунд. Результаты подтверждают механизм генерирования сигнала акустической эмиссии, связанный с кооперативным выходом дислокаций на внешнюю поверхность образца. Работа выполнена при финансовой поддержке Российского научного фонда (проект N 15-12-00035). DOI: 10.21883/FTT.2017.12.45232.156

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Section: рис 3 зависимость ψMax (Umax)unclassified

Исследование Механизма Низкочастотной Дискретной Акустической Эмиссии В Ходе Прерывистой Ползучести Алюминиевого Сплава

Шибков¹,

Желтов²,

Гасанов³

et al. 2017

Физика Твердого Тела

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“…Plastic instabilities, which occur in many age-hardenable aluminum alloys [1][2][3][4][5][6][7][8][9][10][11][12][13] within a certain regime of strain rates and testing temperatures, are often associated with the observation of repeated stress serrations in the stress-strain curves of tensile or compression tests. The so-called "jerky" or "serrated" flow is one of the most distinctive examples of plastic instability in dilute alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The so-called "jerky" or "serrated" flow is one of the most distinctive examples of plastic instability in dilute alloys. It is commonly rationalized by the dynamic interactions between solute atoms and mobile dislocations, i.e., dynamic strain aging processes [1,[3][4][5][6]9,11,12,[14][15][16][17][18][19][20][21][22][23]. Early observations of this phenomenon trace back to Le Châtelier who observed stress serration in the plastic flow of mild steel at elevated temperatures [24].…”

Section: Introductionmentioning

confidence: 99%

On the PLC Effect in a Particle Reinforced AA2017 Alloy

Härtel¹,

Illgen²,

Frint³

et al. 2018

Metals

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Abstract:The Portevin-Le Châtelier (PLC) effect often results in serrated plastic flow during tensile testing of aluminum alloys. Its magnitude and characteristics are often sensitive to a material's heat treatment condition and to the applied strain rate and deformation temperature. In this study, we analyze the plastic deformation behavior of an age-hardenable Al-Cu alloy (AA2017) and of a particle reinforced AA2017 alloy (10 vol. % SiC) in two different conditions: solid solution annealed (W) and naturally aged (T4). For the W-condition of both materials, pronounced serrated flow is observed, while both T4-conditions do not show distinct serrations. It is also found that a reduction of the testing temperature (−60 • C, −196 • C) shifts the onset of serrations to larger plastic strains and additionally reduces their amplitude. Furthermore, compressive jump tests (with alternating strain rates) at room temperature confirm a negative strain rate sensitivity for the W-condition. The occurring PLC effect, as well as the propagation of the corresponding PLC bands in the W-condition, is finally characterized by digital image correlation (DIC) and by acoustic emission measurements during tensile testing. The formation of PLC bands in the reinforced material is accompanied by distinct stress drops as well as by perceptible acoustic emission, and the experimental results clearly show that only type A PLC bands occur during testing at room temperature (RT).

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“…A similar technique was also used by Pan [9] with a simpler and more effective data processing technique for the calculation of strains for the points located at the image boundary, holes, cracks and the other discontinuity areas. Xiang [10] used the moving least-squares (MLS) method to smooth the displacement field followed by a numerical differentiation of the smoothed displacement field to get the strain fields. Different from above pointwise algorithms, the Q4-DIC developed by Besnard [11] and the finite element method proposed by Sun [12] can be classified as a continuum method, in which the surface deformation of the sample is measured throughout the entire image area.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Strain Measurements using Digital Image Correlation with a Finite Element Method

Zhao¹,

Zhao²

2013

Journal of the Optical Society of Korea

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This article proposes a digital image correlation (DIC) strain measurement method based on a finite element (FE) algorithm. A two-step digital image correlation is presented. In the first step, the gradientbased subpixels technique is used to search the displacements of a region of interest of the specimen, and then the strain fields are obtained by utilizing the finite element method in the second step. Both simulation and experiment processing, including tensile strain deformation, show that the proposed method can achieve nearly the same accuracy as the cubic spline interpolation method in most cases and higher accuracy in some cases, such as the simulations of uniaxial tension with and without noise. The results show that it also has a good noise-robustness. Finally, this method is used in the uniaxial tensile testing for Dahurian Larch wood specimens with or without a hole, and the obtained strain values are close to the results which were obtained from the strain gauge and the cubic spline interpolation method.

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Time-resolved deformation measurements of the Portevin–Le Chatelier bands

Cited by 65 publications

References 11 publications

Исследование Механизма Низкочастотной Дискретной Акустической Эмиссии В Ходе Прерывистой Ползучести Алюминиевого Сплава

Исследование Механизма Низкочастотной Дискретной Акустической Эмиссии В Ходе Прерывистой Ползучести Алюминиевого Сплава

On the PLC Effect in a Particle Reinforced AA2017 Alloy

Investigation of Strain Measurements using Digital Image Correlation with a Finite Element Method

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