List of publications in 2024, in which our clients describe examples of the use of our company's products:
E. Borovkova, D. Shabanov (Euphrosyne Polotskaya State University of Polotsk). Monitoring of fibroblast at an early age by the method of acoustic emission. Herald of Polotsk State University. Series F. Civil Engineering. Applied Sciences. 2024. No. 1. P. 34-38. DOI: 10.52928/2070-1683-2024-36-1-34-38. https://journals.psu.by/constructions/article/view/5824 (full text). eLibrary ID: 67268820 (full text)
Abstract
The article presents the main results of acoustic emission monitoring of concrete and fibro-concrete at an early age. The main characteristics of acoustic signals arising in a concrete mixture during the structuring of concrete with and without structural reinforcement are presented. In the course of the study, the influence of reinforcement on the processes of acoustic signal extraction during the formation of concrete samples was determined. The physico-chemical processes occurring inside the concrete mixture, associated with internal structural changes and, as a con-sequence, hydration stages, are interconnected with acoustic emission, which is sensitive to the capture of numerous elastic wave signals during the formation of the structure under various conditions
Yu. G. Matvienko, I. E. Vasil’ev, D. V. Chernov, A. G. Kalinin, A. V. Pankov (Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN), Moscow; Zhukovskii Central Aerohydrodynamic Institute (TsAGI), Zhukovskii). Structural–Phenomenological Concept and Acoustic-Emission Diagnostics of Composite Stringers under Three-Point Bending Conditions. J. Mach. Manuf. Reliab. 53, 240–247 (2024). https://link.springer.com/article/10.1134/S1052618824700018 DOI: 10.1134/S1052618824700018. eLibrary ID: 67307177
Abstract
The essence of the proposed methodology for monitoring the kinetics of damage to a deformed material is to establish a correspondence between micro-, meso-, and macrodamage, and the acoustic emission pulses generated in this case. During the loading process of a product, the recorded pulses are divided into pulse flows of low (H), middle (C), and high (B) energy levels, corresponding to the energy of destruction of structural bonds. By calculating the current values of the partial content of acoustic emission pulses in the H, C, and B clusters generated by micro-, meso-, and macrodamage, and comparing them with the threshold ones established during destruction, the load-bearing capacity current level of a product during loading is determined. Application of the developed methodology for identifying zones of developing damage and assessing the load-bearing capacity of the current state of stringers under loading conditions during interlayer shear tests is considered
Matyunin V.M., Marchenkov A.Yu., Petrova M.P., Zilova O.S., Pan'kina A.A., Sviridov G.B. (National Research University Moscow Power Engineering Institute MPEI, Moscow). Determination of the Crack Initiation and Propagation Energies during Instrumented Indentation of Brittle Materials and Hardening Coatings. Russian Metallurgy (Metally). 2024. Vol. 2024, No. 2. P. 472-477. DOI: 10.1134/S0036029524700824. https://link.springer.com/article/10.1134/S0036029524700824 eLibrary ID: 79035011
Abstract
The well-known methods of determining the critical stress intensity factor KIc of the surface layers of materials by indentation of a pyramid for the formation of radial cracks propagating from the vertices of an indent are considered. It is noted that the existing methods for estimating the fracture toughness of a material by indentation do not allow one to determine the crack initiation energy. A technique is proposed to determine the specific crack initiation energy and the specific crack propagation energy using the critical points of a pyramid indentation diagram during instrumented indentation. Energy fracture toughness criterion GIc is found to be related to specific crack propagation energy ωp, which is determined using an indentation diagram, for brittle materials and hardening coatings. This finding makes it possible to develop a technique for rapid estimation of critical stress intensity factor KIc using an indentation diagram recorded during instrumented indentation without measuring the geometric parameters of formed cracks and regardless of their type
E. D. Merson, V. A. Poluyanov, P. N. Myagkikh, D. L. Merson (Research Institute of Advanced Technologies, Tolyatti State University, Tolyatti). Application of the Acoustic Emission Technique for Studying Kinetics of Corrosion Processes in the ZK60 Magnesium Alloy. Russian Journal of Non-Ferrous Metals. 2024. Vol. 65, No. 3. P. 142-150. DOI: 10.1134/S1067821224600923. https://link.springer.com/article/10.1134/S1067821224600923 eLibrary ID: 80498209
Abstract
Low corrosion resistance of magnesium alloys is a challenging problem that hinders their wide implementation in industry and medicine. In this regard, the study of the mechanisms and patterns of corrosion processes in magnesium and its alloys, including the analysis of the kinetics of these processes, is an urgent task. However, the set of methods available for studying the kinetics of corrosion with sufficient time resolution is very limited. Several studies have been published that demonstrated the high sensitivity of the acoustic emission (AE) method to corrosion processes occurring on the surface of magnesium alloys. Although these studies suggested that AE is associated with the release of hydrogen bubbles accompanying corrosion, no direct relationship has yet been established between the amount of hydrogen released and the AE characteristics. The present study aims at filling this gap. To conduct the study, a special setup with a corrosion cell was developed that allows monitoring changes in the volume of hydrogen released from the corroding surface of the sample, concurrently with recording AE signals and changes in the open-circuit potential (OCP) accompanying the corrosion process. Using this technique, the corrosion of ZK60 alloy in a 0.9% NaCl solution was examined. It was found that intense AE accompanied the corrosion process of this alloy from the beginning to the end of the test. A correlation was found between the AE characteristics, the volume of released hydrogen, and the OCP values at various intervals of the test. In particular, a linear relationship was discovered between the number of AE signals and the volume of hydrogen released during the corrosion process. The sensitivity of the method based on AE registration to the released hydrogen volume is shown to be several orders of magnitude higher than that of the conventional method of collecting hydrogen using a burette
Ivanov V.I., Musatov V.V., Sazonov A.A., Shelobkov V.I. Method of measuring electrical parameters of piezoelectric transducers. Russian patent №2829570 (2024). eLibrary ID: 75120423
Abstract
Field: measuring equipment. Substance: essence of the method for determining electrical parameters of a piezoelectric transducer is that excitation of converter is carried out by means of electric noise signal, arising as a result of intrinsic thermal oscillations of the polarized piezoelectric material of the piezoelectric element of the transducer, recording the electrical signal obtained at the output of the converter in the operating frequency range of the transducer, determining transducer parameters using values of characteristic frequencies of extrema, corresponding to resonance and anti-resonance frequencies and signal values at extremum frequencies related to resonance and anti-resonance frequencies of transducer natural oscillations. Effect: high accuracy and reliability of determining parameters of piezoelectric transducers
Yu. G. Matvienko, I. E. Vasil'ev, T. D. Balandin, D. V. Chernov (Mechanical Engineering Research Institute of the Russian Academy of Sciences, Moscow). Features of Constructing Planar Localization of Acoustic Emission Sources Using Inglada's Triangulation Algorithm. Russian Journal of Nondestructive Testing. 2024. Vol. 60, No. 12. P. 1325-1334. DOI: 10.1134/S1061830924602599. https://link.springer.com/article/10.1134/S1061830924602599 eLibrary ID: 80381377
Abstract
This work is dedicated to the development of a method for improving the efficiency of detecting acoustic emission (AE) sources in planar location using Inglada’s algorithm. The main factors influencing the error in determining the coordinates of AE sources in planar location using the standard method are considered. These include the threshold method for determining the moment of signal registration by AE transducers based on the rising wavefront exceeding the discrimination threshold (uth), the signal sampling frequency level (fd), and the influence of the dispersion properties of the medium on the attenuation of pulse amplitude and the speed of propagation. To reduce the impact of the factors listed above on the results of the coordinate location of AE sources, a new method is proposed, based on the use of correlation dependences of the AE pulse propagation speed in relation to the amplitude of the recorded signals and accounting for the delay in the moment of pulse recording by AE transducers in the threshold detection method. A series of preliminary tests were carried out to implement the proposed method during which AE pulses with a maximum amplitude level of um = 45–90 dB were generated using an electronic simulator. The position of the AE pulse emission source varied in the range from 150 to 700 mm relative to the receiving transducers of the antenna array. As a result of applying the developed method, the probability of detecting AE sources increased to p=0.71, whereas with the standard approach it did not exceed p=0.36
Matvienko Yu.G., Vasilev I.E., Chernov D.V., Balandin T.D. Method of determining coordinates of acoustic emission sources in planar location. Russian patent №2830422 (2024). eLibrary ID: 75121640
Abstract
Field: measuring. Substance: invention can be used to determine coordinates of acoustic emission sources during planar location. Essence of the invention consists in the fact that the values of the recording time of acoustic signals are specified by the antenna array transducers t1'=t1+Δt1, t2'=t2+Δt2, t3'=t3+Δt3 and design speed υg(um), normalized relative to velocity of longitudinal wave (c) in the controlled object, using coefficients of regression models A1…A4, B1...B4, C1…C4 in formulas of corrections, based on which coordinates of acoustic emission sources are determined. Effect: reduced error and increased accuracy of location of acoustic emission sources
N. A. Makhutov, I. E. Vasil'ev, V. Yu. Fursov, D. F. Skvortsov (Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN), Moscow). Combined Application of Acoustic Emission and Vibration Diagnostics in Statistical Tensile Tests of Samples with a Combined Stress Concentrator. Journal of Machinery Manufacture and Reliability. 2024. Vol. 53, No. S2. P. S199-S205. DOI: 10.1134/S1052618824701371. https://link.springer.com/article/10.1134/S1052618824701371. eLibrary ID: 79610825
Abstract
The methodology of combined application of acoustic emission diagnostics and vibration diagnostics for monitoring the state of damage of samples made of 17GS1 pipe steel with a combined stress during the development of a dominant crack is considered. In the experiments, the stress concentrator is a transverse weld subjected to local crumbling and a guide scratch to a depth of up to 3 mm across the entire sample width. Such a concentrator simulated the effect of buried reinforcement on the weld when laying a pipeline through a water obstacle
Chernov D.V., Vasilev I.E., Makhutov N.A., Matvienko Yu.G. Method for monitoring kinetics of brittle and viscous damages at stages of evolution of destruction of structural materials. Russian patent №2822717 (2024). eLibrary ID: 68601792