Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal
One of the main conditions of safe operation of gas pipelines is the use of non-destructive diagnostic methods. Particularly important problem is the earlier operational diagnosis of pipes’ material of main gas pipelines based on the evaluation of the stress-strain state, elastic moduli and properti...
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Belarusian National Technical University
2019-03-01
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| Series: | Приборы и методы измерений |
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| Online Access: | https://pimi.bntu.by/jour/article/view/423 |
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| author | L. V. Volkova O. V. Murav’eva V. V. Murav’ev I. V. Buldakova |
| author_facet | L. V. Volkova O. V. Murav’eva V. V. Murav’ev I. V. Buldakova |
| author_sort | L. V. Volkova |
| collection | DOAJ |
| description | One of the main conditions of safe operation of gas pipelines is the use of non-destructive diagnostic methods. Particularly important problem is the earlier operational diagnosis of pipes’ material of main gas pipelines based on the evaluation of the stress-strain state, elastic moduli and properties anisotropy by acoustic methods. The aim of the work is to develop methods for acoustic assessment of the stress-strain state, the elastic moduli and the properties anisotropy of pipeline material and to study these characteristics in different sections of main pipelines using a device based on contactless EMA transducers.Methods are implemented using specialized equipment (the structurescope SEMA) and non-contact electromagnetic acoustic transducers. As an object of research, we used fragments – the cuttings of gas pipelines with circumferential welds both after fabrication and removed from service with stress corrosion cracking, including ones with corrosion damage and without visible damage.The method of determining the plane stress-strain state of pipeline elements is based on the phenomenon of acoustoelasticity – the dependence of the propagation velocity of ultrasonic waves on mechanical stresses. The method for determining the elastic characteristics of materials and the anisotropy of their properties is based on the relationship between the velocities of ultrasonic waves and the elastic properties of the medium. Both techniques are implemented by sounding the sample in one section using a longitudinal wave and two shear waves with mutually perpendicular polarization planes coinciding with the main stresses, and measuring their propagation times.It is shown that the stress state distribution both in the circumferential direction and along the generatrix is uneven which is caused by the peculiarities of samples (presence of a welded joint, stress corrosion cracking, long-term operation). The smallest acoustic anisotropy is observed for the Young's modulus. The anisotropy of the properties of most samples is in the range of 12–14 % for shear modulus, 9–10 % for Young’s modulus, 13–15 % for Poisson’s ratio. For samples with stress corrosion cracking a sharp decrease in the anisotropy coefficient is observed which makes it possible to use the indicated characteristics as informative parameters in detecting stress corrosion cracking.A feature of the proposed methods is high accuracy, due to the absence of necessity to determine the material density and precision measurement of its thickness, the measurement error of which is significant by known methods.Keywords: main gas pipeline, elastic moduli, acoustic anisotropy of properties, the biaxial stress-strain state, longitudinal and transversal waves. |
| format | Article |
| id | doaj-art-8173dfff1bf047c2841fa712c0e1ee2a |
| institution | Kabale University |
| issn | 2220-9506 2414-0473 |
| language | English |
| publishDate | 2019-03-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Приборы и методы измерений |
| spelling | doaj-art-8173dfff1bf047c2841fa712c0e1ee2a2025-02-03T05:16:49ZengBelarusian National Technical UniversityПриборы и методы измерений2220-95062414-04732019-03-01101425210.21122/2220-9506-2019-10-1-42-52338Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ MetalL. V. Volkova0O. V. Murav’eva1V. V. Murav’ev2I. V. Buldakova3Kalashnikov Izhevsk State Technical UniversityKalashnikov Izhevsk State Technical University; Udmurt Federal Research Center, Ural Branch of the Russian Academy of SciencesKalashnikov Izhevsk State Technical University; Udmurt Federal Research Center, Ural Branch of the Russian Academy of SciencesKalashnikov Izhevsk State Technical UniversityOne of the main conditions of safe operation of gas pipelines is the use of non-destructive diagnostic methods. Particularly important problem is the earlier operational diagnosis of pipes’ material of main gas pipelines based on the evaluation of the stress-strain state, elastic moduli and properties anisotropy by acoustic methods. The aim of the work is to develop methods for acoustic assessment of the stress-strain state, the elastic moduli and the properties anisotropy of pipeline material and to study these characteristics in different sections of main pipelines using a device based on contactless EMA transducers.Methods are implemented using specialized equipment (the structurescope SEMA) and non-contact electromagnetic acoustic transducers. As an object of research, we used fragments – the cuttings of gas pipelines with circumferential welds both after fabrication and removed from service with stress corrosion cracking, including ones with corrosion damage and without visible damage.The method of determining the plane stress-strain state of pipeline elements is based on the phenomenon of acoustoelasticity – the dependence of the propagation velocity of ultrasonic waves on mechanical stresses. The method for determining the elastic characteristics of materials and the anisotropy of their properties is based on the relationship between the velocities of ultrasonic waves and the elastic properties of the medium. Both techniques are implemented by sounding the sample in one section using a longitudinal wave and two shear waves with mutually perpendicular polarization planes coinciding with the main stresses, and measuring their propagation times.It is shown that the stress state distribution both in the circumferential direction and along the generatrix is uneven which is caused by the peculiarities of samples (presence of a welded joint, stress corrosion cracking, long-term operation). The smallest acoustic anisotropy is observed for the Young's modulus. The anisotropy of the properties of most samples is in the range of 12–14 % for shear modulus, 9–10 % for Young’s modulus, 13–15 % for Poisson’s ratio. For samples with stress corrosion cracking a sharp decrease in the anisotropy coefficient is observed which makes it possible to use the indicated characteristics as informative parameters in detecting stress corrosion cracking.A feature of the proposed methods is high accuracy, due to the absence of necessity to determine the material density and precision measurement of its thickness, the measurement error of which is significant by known methods.Keywords: main gas pipeline, elastic moduli, acoustic anisotropy of properties, the biaxial stress-strain state, longitudinal and transversal waves.https://pimi.bntu.by/jour/article/view/423магистральный газопроводмодули упругостиакустическая анизотропия свойствдвухосное напряженно-деформированное состояниепродольные и поперечные волны |
| spellingShingle | L. V. Volkova O. V. Murav’eva V. V. Murav’ev I. V. Buldakova Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal Приборы и методы измерений магистральный газопровод модули упругости акустическая анизотропия свойств двухосное напряженно-деформированное состояние продольные и поперечные волны |
| title | Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal |
| title_full | Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal |
| title_fullStr | Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal |
| title_full_unstemmed | Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal |
| title_short | Device and Methods for Measuring of Acoustic Anisotropy and the Residual Stress in the Main Gas Pipelines’ Metal |
| title_sort | device and methods for measuring of acoustic anisotropy and the residual stress in the main gas pipelines metal |
| topic | магистральный газопровод модули упругости акустическая анизотропия свойств двухосное напряженно-деформированное состояние продольные и поперечные волны |
| url | https://pimi.bntu.by/jour/article/view/423 |
| work_keys_str_mv | AT lvvolkova deviceandmethodsformeasuringofacousticanisotropyandtheresidualstressinthemaingaspipelinesmetal AT ovmuraveva deviceandmethodsformeasuringofacousticanisotropyandtheresidualstressinthemaingaspipelinesmetal AT vvmuravev deviceandmethodsformeasuringofacousticanisotropyandtheresidualstressinthemaingaspipelinesmetal AT ivbuldakova deviceandmethodsformeasuringofacousticanisotropyandtheresidualstressinthemaingaspipelinesmetal |