Means for Increasing the Sensitivity of Acoustic Probing when Studying the Structure of Metals

Ерофеев, В. И.; Ilyahinskii, A. V.; Nikitina, E. A.; Rodyushkin, V. M.

doi:10.1134/s106183091802002x

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Известно, что изменение структуры и химического состава металлов и сплавов приводит к изменению их основных акустических свойств [1][2][3][4][5][6][7][8][9]. К таким свойствам относятся скорость распространения ультразвуковых волн и их затухание [10][11][12][13][14][15][16].…”

Section: Introductionunclassified

Creation of Pulse Method for Measurement of Ultrasonic Velocity with High Accuracy

Muravyov¹,

Злобин²,

Zemskov³

et al. 2021

Intellekt. Sist. Proizv.

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В статье обсуждаются способы высокоточного определения скорости ультразвука в твердых материалах. Описана методика проведения точных измерений временных интервалов ультразвуковых импульсов, приведена блок-схема экспериментальной установки. Установка построена на широкодоступных компонентах, возможна ее простая модернизация. Предложено использование датчика на основе сегнетоэлектрического полимера поливинилиденфторида в качестве источника излучения и приема продольных волн. В качестве объектов контроля используются концевые меры длины и ступенчатый образец из стали, изготовленный с использованием плоскошлифовального станка. Представлены результаты определения скорости, подтвержденные многократными измерениями на ступенчатом объекте с разницей по толщине ступеней 10 мкм. Проведен эксперимент при изменяемой температуре образцов концевых мер длины, подтверждающий точность измерений и разницу в рассчитанной скорости, свидетельствующий о разном структурном составе объектов. Определен химический состав образцов концевых мер длины с использованием рентгено-флуоресцентного анализатора. Представлен график зависимости плотности объектов от скорости ультразвука. Описаны погрешности измерений, способы их расчета, в частности временная задержка при использовании пленочного датчика. Абсолютная погрешность определения скорости ультразвуковых продольных волн не превышает 2 м/с, что позволяет фиксировать крайне малые отклонения скорости ультразвука в образцах.

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Section: Introductionunclassified

Creation of Pulse Method for Measurement of Ultrasonic Velocity with High Accuracy

Muravyov¹,

Злобин²,

Zemskov³

et al. 2021

Intellekt. Sist. Proizv.

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“…In [7], the possibilities of ultrasonic testing, based on the measurement of the delay (propagation time) of surface waves on a fixed base, or on the results of measuring the nonlinearity of a wave or changing its shape (self-organization coefficient), are investigated. We used the measurement of the delay (propagation time) of surface waves on a fixed base as the simplest and most acceptable diagnostic feature of the degradation processes occurring in the metal, and, consequently, the elongation of the tap bolts that occurred during the operational cycle.…”

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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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Rayleigh surface waves in assessing the state of metal structures

Ерофеев

Rodyushkin

Ilyakhinsky

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The work is devoted to the search of a method of ultrasonic sounding for identification of the material state, permitting to refer the diagnosed structure to the class of structures, whose state is connected with the appearance of plastic deformations. The study has shown the application of surface Rayleigh waves allows to estimate the stress-strain state of metal structures in the field of both elastic and plastic deformation.

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Means for Increasing the Sensitivity of Acoustic Probing when Studying the Structure of Metals

Cited by 5 publications

References 3 publications

Creation of Pulse Method for Measurement of Ultrasonic Velocity with High Accuracy

Creation of Pulse Method for Measurement of Ultrasonic Velocity with High Accuracy

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

Rayleigh surface waves in assessing the state of metal structures

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