Ultrasonic nondestructive evaluation of microstructural changes of solid materials under plastic deformation—Part II. Experiment and simulation

Kobayashi, Michiaki

doi:10.1016/s0749-6419(98)00006-0

Cited by 37 publications

(8 citation statements)

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“…Later this theory was expanded by Maurel [13]. Experimental investigations of the propagation velocity and the attenuation of ultrasound waves in metallic materials during plastic flow were carried out by Gremaud et al [14], by Ogi et al [15], by Zuev et al [16,17] and Kobayashi [18,19].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

et al. 2018

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Investigations of propagation velocity and attenuation change of the Rayleigh waves depending on plastic strain localization in materials having the Portevin-Le Chatelier effect are presented in this paper. Measurements of the ultrasound wave characteristics were carried out in situ during specimen tensile at the constant rate and room temperature. Registration of localized strain band kinetics was performed with the digital speckle photography method. The regularity of ultrasound velocity change during the band propagation through the ultrasound measurement area was discovered.

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Section: Introductionmentioning

confidence: 99%

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

et al. 2018

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“…If it remains undetected, an invisible crack produced by a fatigue load or impact may induce a highly localized stress region even under a small external load, degrading the mechanical integrity. − Nondestructive testing, which predicts the formation of microcracks in materials and the stress distribution caused by the cracks without destroying previously operated equipment and parts, has attracted considerable attention . Several nondestructive techniques have been proposed for detecting microcracks: optical transmission, , scanning acoustic microscopy, , resonance ultrasonic vibration, − luminescence imaging, , and others. , However, there are limitations in predicting the distribution of stress fields around microcracks, and the testing method can be enhanced by improving the price competitiveness, equipment management, field of view, and data processing. Along with the presence of microcracks, the stress field in the vicinity of a microcrack is an important factor as it can reveal the fracture driving force and the crack propagation direction. , Therefore, it is necessary to develop a nondestructive method that can visualize the stress distribution around microcracks over a large area.…”

Section: Introductionmentioning

confidence: 99%

Improving the Sensitivity of the Mechanoluminescence Composite through Functionalization for Structural Health Monitoring

Song

Timilsina

Jung

et al. 2022

ACS Appl. Mater. Interfaces

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Over the past few years, considerable effort has been directed toward the development and improvement of mechanoluminescence (ML)-based stress sensing as an efficient nondestructive inspection technique. One of the challenges in ML stress sensing is the limited luminescent intensity and sensitivity of the ML-epoxy composite film to the local stress field. Herein, we present a novel approach for increasing the sensitivity of ML composites made of an epoxy resin matrix and SrAl 2 O 4 :Eu 2+ , Dy 3+ particles functionalized with (3-aminopropyl)triethoxysilane. We performed a tensile test on an epoxy/ML composite specimen to investigate the effect of surface modification of ML particles on the luminescent sensitivity. A series of characterization analyses were performed on the modified surface to investigate the interfacial bonding. In addition, we applied the modified ML/epoxy paint to one side of the tensile specimen with an artificial invisible notch on the other side to visualize the stress field via light intensity (LI) distribution and then compared the results through a finite-element analysis (FEA). Surface modification of ML particles increased the sensitivity and introduced new chemical bonds, corresponding to a larger stress transfer through interfacial bonding rather than mere mechanical locking. In addition, the applied ML film on the notched specimen could visualize the specific pattern of LI reflecting the presence of a crack, which was confirmed by the FEA simulation. This implies that the proposed method of enhancing the ML film is promising for nondestructively predicting the presence, shape, and residual life of a crack in a specimen.

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“…Следовательно, различные структурно-чувствительные способы ультразвукового контроля могут быть использованы для оценки состояния материала, испытывающего пластическую деформацию. Среди них хорошо известны способы, основанные на измерении скорости [1][2][3][4][5], затухания [5][6][7][8], параметра акустической анизотропии (двулучепреломления) [6,[9][10][11][12][13], параметра нелинейности [5,[14][15][16][17]. Ранее [18] на примере низколегированной стали 09Г2С было показано, что определяемые ультразвуковым методом коэффициент Пуассона и параметр акустической анизотропии линейно связаны с характеристиками текстуры -коэффициентами функции распределения ориентировок [19,20].…”

Section: Introductionunclassified

Effect of Strain on the Elastic Anisotropy and Ultrasonic Wave Velocities in Low-Carbon Steel

Гончар

Kurashkin

Sergeeva

et al. 2022

PSP

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The results of experimental studies of the effect of plastic deformation on the velocities of transverse, longitudinal and head waves in hot-rolled sheet steel 20 are presented. Sheet-type specimens cut from the sheet along and across the rolling direction were tested in stages for uniaxial tension with a residual strain step of 4%.The tensile diagrams obtained for the specimens have the yield plateau, which is typical for low-carbon steel. After each stage, the specimens were unloaded and structurally sensitive ultrasonic measurements were carried out using shear, longitudinal and head wave transducers.It is found that the velocities of shear and longitudinal waves vary slightly until the moment of loss in local stability and the velocity of head waves decreases monotonically and in fact linearly with plastic deformation. The change in the anisotropy of the material elastic properties during plastic deformation is also investigated: monotonic dependences of the acoustic anisotropy parameter (birefringence of shear waves) and the relative difference in the velocities of longitudinal and head waves on the residual plastic strain are obtained. The presented ultrasonic investigations provide information about changes in the material structure due to plastic deformation: texture evolution and microdamage accumulation. Correlations between the material damage parameter and the elastic anisotropy parameters are obtained, which can be used for ultrasonic monitoring the state of plastically deformed steel. Additional optical studies of microstructure evolution on the surface have shown that during plastic deformation, grain rotations and localization of plastic deformation (Luders–Chernov bands) occur, as evidenced by the defocusing of individual microzones of the image, and persistent slip bands are formed in individual grains.

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Ultrasonic nondestructive evaluation of microstructural changes of solid materials under plastic deformation—Part II. Experiment and simulation

Cited by 37 publications

References 0 publications

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

Improving the Sensitivity of the Mechanoluminescence Composite through Functionalization for Structural Health Monitoring

Effect of Strain on the Elastic Anisotropy and Ultrasonic Wave Velocities in Low-Carbon Steel

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