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2020 №02 (08) DOI of Article
10.37434/tdnk2020.02.01
2020 №02 (02)

Technical Diagnostics and Non-Destructive Testing 2020 #02
Technical Diagnostics and Non-Destructive Testing #2, 2020, pp. 3-12

Features of acoustic emission at evaluation of the state of materials

S.A. Nedoseka, A.Ya. Nedoseka, O.I. Boichuk, M.A. Yaremenko, M.A. Ovsienko
E.O. Paton Electric Welding Institute of NASU, 11 Kazymyr Malevych, Kyiv, 03150. E-mail: office@paton.kiev.ua

Conducted investigations were the base to formulate a hypothesis, which shows that acoustic emission is a mirror reflection, and, therefore, an acoustic certificate of material characteristics that change in operation, and, in particular, of their mechanical properties. Use of this hypothesis was verified in practice and allows prediction of breaking loading of the material without interrupting the object service and without the need to have prior knowledge of initial values of mechanical properties of the materials. In keeping with the presented hypothesis, AE reflects not the properties of the material proper, but their change, and it automatically adapts to such changes, irrespective of material type. Experiments, conducted with numerous materials, differing by their physical characteristics, including steels of different classes, aluminium alloys, concretes and composites, showed that limit breaking load of these materials by AE data is determined by the same algorithm with an error related just to the technical features of the measurement instruments. Accumulated experience allowed moving over to creation of an intelligent technology for assessment of structure material state in operation, and of AE systems based on it. Such systems have already become widely used at continuous monitoring of the state of the structure in production environment. 10 Ref., 8 Fig.
Keywords: acoustic emission, prediction of breaking load; physical characteristics of materials, vector of material state; damage, resource

Received: 25.01.2020

References

1. Nedoseka, A.Ya., Nedoseka, S.A. (2020) Fundamentals of design and diagnostics of welded structures: Monography. 5th Ed. by B.E.Paton. Kiev, Indprom [in Russian].
2. Nedoseka, S.A. (1994) Investigation of the kinetics of metal fracture at final stages of deformation by acoustic emission method. In: Syn. of Thesis for Cand. of Techn. Sci. Degree. Kiev [in Russian].
3. Chausov, N.G. (1992) Kinetics of metal fracture at final stages of deformation. In: Syn. of Thesis for Dr. of Techn. Sci. Degree. Kiev [in Russian].
4. Nedoseka, A.Ya., Nedoseka, S.A., Markashova, L.I. et al. (2018) Investigation by acoustic emission method of the kinetics of damage accumulation at fracture of materials. Tekh. Diagnost. i Nerazrush. Kontrol, 3, 3-13 [in Ukrainian]. https://doi.org/10.15407/tdnk2018.03.01
5. Nedoseka, A.Ya., Nedoseka, S.A., Markashova, L.I. et al. (2017) Accumulation of dameges in materials during fracture. Ibid., 3, 3-13 [in Ukrainian]. https://doi.org/10.15407/tdnk2017.03.01
6. Nedoseka, S., Nedoseka, A., Shevtsova, M. (2019) Acoustic emission testing of composite materials including specimens simulating the embedded sensors. Civil Eng. Res. J., 9(1):557754. https://doi.org/10.19080/CERJ.2019.09.555754
7. Vasiliev, O.S., Gruzd, A.A., Jolkin, A.O. et al. (2012) Ten year experience of introduction of continuous acoustic emission monitoring in ammonia storage facilities at Odessa Port Plant. Khimichna Promyslovist Ukrainy, 3, 43-52 [in Ukrainian].
8. Paton, B.E., Lobanov, L.M., Nedoseka, A.Ya., Nedoseka, S.A. (2018) On the application of AE technology in continuous monitoring of pipelines of power units operating at high temperatures. Int. J. of Condition Monitoring, 8. https://doi.org/10.1784/204764218824811570
9. Nedoseka, S.A., Nedoseka, A.Ya. (2010) Integrated assessment of damage level and residual life of metals with certain operating life. Tekh. Diagnost. i Nerazrush. Kontrol, 1, 9-16 [in Russian].
10. Nedoseka, A.Ya. (2013) Software of AE diagnostic systems EMA-3.9. Ibid., 3, 16-22 [in Russian].

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