List of publications in 2019, in which our clients describe examples of the use of our company's products:
D.S. Bals, L.A. Vinogradov, Yu. Soldatova (TTS LNK Industries, Riga, Latvija; Riga Technical University Institute of Civil Aviation, Riga, Latvija). Quality control of multi-pass weld by means of acoustic emission. Machines. Technologies. Materials. 2019. V. 13. No. 6. Pp. 263-265. https://stumejournals.com/journals/mtm/2019/6/263.full.pdf (full text). https://stumejournals.com/journals/mtm/2019/4/152.full.pdf (full text)
Abstract
The article proposes a method of assessing the quality of multi-pass weld by acoustic emission. The AE method involves the identification of developing defects at the stage of stress changes in the material, as well as in the statically loaded state. In the process of control two independent data collection systems were used, which worked in the process of testing synchronously. The selected method of control of the object has a number of advantages over other methods of NDT.
E. Klyuchka, D. Kuznetsov, V. Dudnik, A. Lukyanov, V. Gaponov (Don State Technical University, Rostov-on-Don; Platov South-Russian State Polytechnic University (NPI), Novocherkassk). New methods of seeds functional state and activity control for the development of the biotechnical feedback concept. AIP Conference Proceedings 2188, 030015 (2019); DOI: 10.1063/1.5138408. https://aip.scitation.org/doi/pdf/10.1063/1.5138408 (full text). eLibrary ID: 43229414
Abstract
The practical implementation of the methods of analysis of the functional state of the biotechnological system is considered. It is shown that the indicator of habitat assessment can be the plants themselves, which reflect all the changes. Biotechnical feedback is a source for the Databases formation in the biotechnological system. The hypothesis was offered that the productivity of plants, which depends on three elements of the light environment (spectrum, intensity, time of exposure). A system for experimental studies on light stimulation of vegetable and green crops has been developed. The results of studies showing the influence of different light stimulation spectra are presented. Method of acoustic signals of seeds (method of acoustic emission in a liquid) was proposed to determine the functional activity of seeds. An experimental system was created to detect the generated acoustic waves at the initial stage of plant ontogenesis. Thus biotechnological systems for growing plants in an artificial microclimate should be built on the basis of biotechnical feedback.
Ryakhovskikh I. V. (Gazprom VNIIGAZ LLC). Regularities of the near-neutral pH stress corrosion cracking of gas pipelines. Научно-технический сборник Вести газовой науки. 2019. No 3(40). P. 43-59. http://www.vesti-gas.ru/sites/default/files/attachments/vgn-3-40-2019-043-059.pdf (full text). eLibrary ID: 42517478 (full text)
Abstract
The article considers stress corrosion cracking (SCC) prediction models for pipes steels describing main stages of the process, their rates and implementation conditions. A number of tests, namely: electrochemical, corrosion-mechanical, mechanical, operational life tests, X-ray tests of layer-by-layer texture and residual stresses, analysis of micro and dislocation structure, were carried out for Х70-steel pipes manufactured in Germany and USSR, after these pipes had been operated within the gas pipelines for a long time. It was shown that the texture nonuniformity of steels and residual process stresses in pipes are the parameters characterizing resource for growth or slowdown of cracks at initial stages. The cyclic tests did not identify any indicators of fatigue growth and significant changes of dislocational structure in the areas close to the cracks ~0,2δ deep (where δ is the pipe wall thickness). During static and low-amplitude cyclic loads in the test environment with рН = 5,5…7,0 the rate of crack growth accelerates with available component (sulfide, carbonate, or phosphate) stimulating the anodic dissolution.It was found out that SCC-cracks not deeper than 0,2δ were not dangerous for pipelines reliability;on exposure of corrosion environment the forecasted growth rates of such defects did not exceed0,3…0,4 mm per year, apart from cracks located in the welded joints and along the weld-fusion line. Growing of the 0,2δ deep SCC-cracks would stop without electrolyte.
S. I. Builo, D. M. Kuznetsov, V. L. Gaponov (Vorovich Institute of Mathematics, Mechanics, and Computer Science, Southern Federal University, Rostov-on-Don; Platov South-Russian State Polytechnic University, Novocherkassk; Don State Technical University, Rostov-on-Don). Acoustic-Emission Monitoring of Nonequilibrium Stage of Electrolysis. Russian Journal of Nondestructive Testing. 2019. Vol. 55. No 11. P. 803-807. DOI 10.1134/S1061830919110032. eLibrary ID: 43250130
Abstract
We consider some features of applying the method of acoustic emission (AE) for monitoring electrolysis. The dynamics of changes in AE at the nonequilibrium stage of electrodeposition of copper from a sulfate electrolyte is described. It is shown that the AE method allows one to evaluate the kinetics of electrolysis and recognize its nonequilibrium stage. The foundations of a method for determining the dynamics of electrolysis in real time based on the parameters of the concomitant emission of ultrasound are proposed.
Vasilev I.E., Matvienko Yu.G., Chernov D.V., Makhutov N.A., Ivanov V.I. Method of simulating transient processes of accumulation of damages in a diagnosed object and a device of a bifurcation model. Russian patent №2704575 (2019). eLibrary ID: 41323015
Abstract
Field: simulation of processes. Substance: use to simulate unstable transient processes of damage accumulation in a diagnosed object with registration of points of structural and system bifurcation. Summary of invention consists in the fact that to record dynamics of transient processes during formation of bulk cone and change of their trend at points of structural and system bifurcation, due to accumulation of critical mass of granulate at apex of cone, its settling under action of own weight and subsequent avalanche caving, it is proposed to create conditions of conic surface collapse of granulate at low thickness of formed layer δ=10–20 mm, and time strobing of transient processes is carried out by synchronous recording of video images and arrays of local pulses, recorded using acoustic emission monitoring, every second separating AE signals into clusters of lower, middle and upper energy level, by counting frequency of their registration ωi=L,M,U and percentage content Wi=L,M,U, fixing the dynamics of these parameters on the graphs and changing the trend of transient processes at the points of structural and system bifurcation, thus confirming the moments of their recording with frames of high-speed video filming. Effect: possibility of simulating the dynamics of changing trend of accumulation of damages in points of structural and system bifurcation occurring in the diagnosed object.
Y. G. Matvienko, I. E. Vasil'ev, D. V. Chernov (Mechanical Engineering Research Institute, Russian Academy of Sciences, Moscow). Study of the Fracture Kinetics of a Unidirectional Laminate Using Acoustic Emission and Video Recording. Inorganic Materials. 2020. Vol. 56. No 15. P. 1536-1550. DOI 10.1134/S0020168520150145. eLibrary ID: 44965094
Abstract
The kinetics of fracture of structural bonds in a unidirectional laminate package under the effect of tensile load is studied using acoustic emission (AE) combined with video recording. A correspondence between the fractures occurring at micro-, meso-, and macroscale levels of the laminate package and the location pulses thus recorded and their energy parameters, shape, and spectrum is determined. Data on testing of the new criterion parameters used in acoustic emission monitoring, including the frequency of registration of location pulses in energy clusters and their weight content, as well as the methods providing separation of location pulses into the clusters with similar spectra related to the same or similar types of acoustic emission events, are presented. The proposed parameters and structural-phenomenological approach implemented through dividing the entire array of acoustic-emission data into energy clusters make it possible to quantify the degree of destruction of structural bonds of structural material at all scale levels and predict the residual strength of the product. Fusion of the acoustic emission events recorded at different stages of specimen loading and images of video recording of damage accumulation and fracture of the structural bonds in a unidirectional laminate package revealed the correspondence between the fracture of the composite occurring at micro-, meso-, and macroscale levels, acoustic waves thus generated and location pulses, and their energy parameters, shape, and spectrum
Matvienko Y.G., Vasil’ev I.E., Chernov D.V., Pankov V.A. (Mechanical Engineering Research Institute, Russian Academy of Sciences, Moscow; Central Aerohydrodynamic Institute (TsAGI), Zhukovskii). Acoustic-emission monitoring of airframe failure under cyclic loading. Russian Journal of Nondestructive Testing, 2019, 55, 8, pp. 570-580. DOI: 10.1134/S1061830919080084. eLibrary ID: 41706288
Abstract
The structural–phenomenological approach used to classify and split acoustic-emission signals into energy clusters, together with the parameters of detection frequency and weight content of location pulses in the clusters, allows real-time monitoring of main trends in damage accumulation at different structural levels and makes it possible to isolate signals generated during the failure of a structural material from accompanying mechanical interference and electromagnetic noise. An example of applying new criterion parameters to determining the moment of delamination of stringer runoffs from the shelves of the MC-21 airframe support strut under conditions of fatigue tests with a symmetric loading cycle is provided. Using the new criterion parameters and developed cluster-analysis techniques, employed, among other things, to discriminate location pulses in the field of spectral characteristics, an interconnection has been established between the process of breaking cohesive and adhesive bonds in the adhesive layer at the boundary between the stringer runoff fastening and the support strut shelves and the generated acoustic signals by their energy, waveform, and spectrum.
E. А. Novikov, V. L. Shkuratnik, M. G. Zaytsev. Manifestations of Acoustic Emission in Frozen Soils with Simultaneous Influence of Variable Mechanical and Thermal Effects on Them. Journal of Mining Institute. 2019. Vol. 238. P. 383-391. DOI 10.31897/PMI.2019.4.383. https://pmi.spmi.ru/index.php/pmi/article/view/13211/11966 (full text). eLibrary ID: 41210668
Abstract
The subject of the research is to establish the fundamental laws of acoustic emission in frozen soils, which allow to create ways to control (monitor) their stability under the influence of variable temperature fields and quasistatic mechanical stress from engineering objects located on these grounds for various purposes. The applied importance of such methods is to increase the speed and reduce the complexity of engineering geological surveys in the northern regions of Russia, carried out with the aim of predicting the loss of stability of the bases of buildings and structures to ensure their safe operation. The study was performed on the original instrumental complex. Its description and characteristics are given. With the use of this complex, thermoacoustic emission effects arising from the repeated alternation of freezing and thawing cycles of the soil during the development of its deformed state, starting from the normal compaction phase and up to the final stage of destruction (the bulging phase), have been studied. It is shown that on the basis of such informative parameters as thermally stimulated activity and duration of acoustic emission pulses, an indicator can be obtained that quantitatively characterizes the stages of the stress-strain state of soils. An experimental dependence of the field of values of this indicator as a function of the mechanical stress and the fractional composition of the test soil is given. The qualitative convergence of this dependence with the classical soil deformation diagram obtained by N.M.Hersevanov is shown, where the stages of compaction, loss of stability (shifts) and destruction are highlighted. Possible physical mechanisms and features of the formation of an acoustic emission response at each of these stages are considered and substantiated. It is noted that the approaches to receiving, processing and interpreting acoustic emission measurement information, which are grounded within the framework of the study, allow to control and monitoring of the carrying capacity and stress-strain state of soils directly in the field.
V. L. Shkuratnik, O. S. Kravchenko, Y. L. Filimonov. Stresses and Temperature Affecting Acoustic Emission and Rheological Characteristics of Rock Salt. Journal of Mining Science. 2019. Vol. 55. No 4. P. 531-537. DOI 10.1134/S1062739119045879. eLibrary ID: 43247213
Abstract
Synchronized acoustic emission and strain measurements were carried out in rock salt samples subjected simultaneously to different levels of uniaxial mechanical and incrementally increasing temperature effects. Methodological and hardware support of such measurements is described. Experimental dependences are obtained, which reflect changes in shear strains and acoustic emission activity of samples as functions of time and temperature for different axial stresses. As the stresses increase, rock salt transits to the stage of progressive creep at lower temperatures. The transition to each subsequent stage of the temperature effect is accompanied by an increase in the steepness of shear strains and activity-average acoustic emission. The patterns of changes in these parameters at the stages of steady and progressive creep of rock salt are analyzed. The advantages of using acoustic emission measurements to predict rock salt failure due to progressive creep, as well as their importance for solving the problem on estimating salt rocks properties in real thermobaric conditions for the construction and operation of underground gas storages are noted.