Measurement of Acoustic Nonlinearity of Damaged Metal

Vanyagin, A.V.; Rodyushkin, V. M.

doi:10.1007/s11018-018-1312-x

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…[1] Nonlinear measurements in metals can provide an indication of pre-damage prior to linear measurements. [2,3] Similarly, cement and rocks are inherently nonlinear because of their mesoscopic structure. However, inducing additional mechanical damage such as cracks and fractures can increase their nonlinear elastic response significantly, making nonlinear measurements sensitive to damage in all of the materials comprising a wellbore system.…”

Section: Motivationmentioning

confidence: 99%

Damage detection in a laboratory-scale wellbore applying Time Reversal and Nonlinear Elastic Wave Spectroscopy (TR NEWS)

Dauson

Donahue

DeWolf

et al. 2022

NDT & E International

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Section: Motivationmentioning

confidence: 99%

Damage detection in a laboratory-scale wellbore applying Time Reversal and Nonlinear Elastic Wave Spectroscopy (TR NEWS)

Dauson

Donahue

DeWolf

et al. 2022

NDT & E International

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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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“…To calculate the ratio of the amplitudes of the first and second partials of the sounding signal, the device developed by the authors was used. This device didn't require special radiophysical knowledge [6] and because of its simplicity and compactness allowed from a technical point of view to implement, in ship conditions, a method for estimation of a crank-shaft metal damage through scavenging ports of the ship engine.…”

mentioning

confidence: 99%

Ultrasonic flaw detection capabilities at first stage of technological process of ship engine overhaul

2018

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The technological process of ship engine overhaul begins with dismantling, while the obligatory operation is flaw detection of parts. The flaw detection at this stage involves certain difficulties due to the fact that the entire repair process takes place directly onboard the ship. It is possible to simplify the task of assessing the technical condition of a particular part, if one can assess the performance of this part before dismantling, saving both material assets and time. However, in vessel design, the equipment developers do not pay due attention to ensuring its controllability. The article describes capabilities of ultrasonic flaw detection that can be realized in ship conditions during the first stage of the ship engine overhaul technological process. The ultrasonic technique for estimation of a crank-shaft metal damage through scavenging ports of the ship engine is discussed; as well as an option to address the issue of repair or replacement of tap bolts according to their actual technical condition.The described capabilities are due to the uniqueness of ultrasonic flaw detection: the internal space of almost all structural materials can be “observed” by waves of a mechanical nature. Elastic waves, probing the metal, react to all the processes occurring in it, they perform the functions of a universal sensor that delivers information about the controlled environment. They allow to recognize an early stage of defect accumulation – micro damage formation, which is quite natural, since the parameters of elastic waves depend on the density, moduli of elasticity, size and geometry of structural inhomogeneities and other characteristics of the test medium.

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Measurement of Acoustic Nonlinearity of Damaged Metal

Cited by 6 publications

References 2 publications

Damage detection in a laboratory-scale wellbore applying Time Reversal and Nonlinear Elastic Wave Spectroscopy (TR NEWS)

Damage detection in a laboratory-scale wellbore applying Time Reversal and Nonlinear Elastic Wave Spectroscopy (TR NEWS)

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

Ultrasonic flaw detection capabilities at first stage of technological process of ship engine overhaul

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