Integrated diagnostics of limit states and early warning of emergency conditions of structures

Махутов, Н. А.; Фомин, А. В.; Иванов, В. И.; Permyakov, V. N.; Васильев, И. Е.

doi:10.3103/s105261881302009x

Cited by 8 publications

(4 citation statements)

References 1 publication

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“…The possibility of cutting metal from an object is not always available during technical diagnostics and industrial safety expertise; therefore, often the only source of information about the state of the metal is non-destructive testing [35][36][37][38]. Currently, control methods are being developed and implemented, the measured characteristics of which are sensitive to changes in structure and mechanical characteristics.…”

Section: Acoustic and Magnetic Characteristics Of Metal Samples Of Power Equipment Made Of Structural And Heat-resistant Steels Before Dementioning

confidence: 99%

“…The characteristics of non-destructive tests for all investigated states of specimens made of 0.2 C steel in the zones of localization of deformation had similar values: the delay time of the surface acoustic wave was 4700 ± 3 ns (Figure 12a); attenuation coefficient of the surface acoustic wave 0.006 ± 0.003 µs −1 (Figure 12b); the amplitude of the received signal of the surface acoustic wave is 227 ± 12 mm −1 (Figure 12c) and the intensity of magnetic noise is 275 ± 31 units (Figure 12d), which indicates the invariability of the characteristics of non-destructive tests in zones of stable localization of deformation. The possibility of cutting metal from an object is not always available during technical diagnostics and industrial safety expertise; therefore, often the only source of information about the state of the metal is non-destructive testing [35][36][37][38]. Currently, control methods are being developed and implemented, the measured characteristics of which are sensitive to changes in structure and mechanical characteristics.…”

Section: Acoustic and Magnetic Characteristics Of Metal Samples Of Power Equipment Made Of Structural And Heat-resistant Steels Before Dementioning

confidence: 99%

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Structural-Phase State, Mechanical Properties, Acoustic and Magnetic Characteristics in the Sustainable Deformation Localization Zones of Power Equipment Made of Structural and Heat Resistant Steels

Ababkov

Смирнов

Данилов

et al. 2021

Metals

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The paper presents the results of the analysis of the microstructure, mechanical properties, acoustic and magnetic characteristics of the metal of pipelines that are part of heat and power equipment, after long-term operation, made of structural and heat-resistant steels in the zones of localization of plastic deformation. Samples of 0.2 С steel and 0.12С-1Сr-1Mo-1V steel were studied in the initial state, as well as after operation for 219 and 360 thousand hours, respectively. As a result of the studies carried out for each sample, the phase composition was determined (qualitatively and quantitatively), and the following parameters of the fine structure were calculated: volume fractions of structural components of steel (pearlite and ferrite), scalar and excess ± dislocation density, curvature-torsion of the crystal lattice χ, amplitude of internal stresses (shear stress and long-range stresses). All quantitative parameters of the structure are determined both in each structural component of steel, and in general for each sample. The structure of the metal of all specimens after deformation before the formation of zones of stable localization of deformations consists of a ferrite-pearlite mixture, and for specimens after operation before fracture only of unfragmented and fragmented ferrite. Ferrite, which occupies the bulk of the material, is present both unfragmented and fragmented. For all samples, the ratios ≥ , χ = χpl, σL ≥ σd were calculated, which indicate whether there is a danger of the initiation of microcracks in metal samples. For specimens without operation and after operation without damage in zones of stable localization of deformations, these conditions are met, and for specimens after operation until destruction, they are not met. It was found that the structural-phase state in the zones of localization of deformations has a direct effect on the characteristics of non-destructive tests. Thus, for all investigated samples, the values of such parameters as the delay time of the surface acoustic wave, the attenuation coefficient, the amplitude of the received signal, and the intensity of magnetic noise in the zones of deformation localization were established.

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Section: Acoustic and Magnetic Characteristics Of Metal Samples Of Power Equipment Made Of Structural And Heat-resistant Steels Before Dementioning

confidence: 99%

Section: Acoustic and Magnetic Characteristics Of Metal Samples Of Power Equipment Made Of Structural And Heat-resistant Steels Before Dementioning

confidence: 99%

Structural-Phase State, Mechanical Properties, Acoustic and Magnetic Characteristics in the Sustainable Deformation Localization Zones of Power Equipment Made of Structural and Heat Resistant Steels

Ababkov

Смирнов

Данилов

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…The condition parameters are monitored in components when changes in the condition parameters can be measured through diagnostics, and the time of pre-failure condition can be determined (Makhutov, et al, 2013). Those are the components that become unserviceable primarily due to parametric failures.…”

Section: Composing Lists Of Components Operated and Repaired Using Vamentioning

confidence: 99%

Development of strategy for ensuring operability of transport and technological machines

et al. 2020

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The article presents the results of research in the field of ensuring the performance of complex technical objects on the example of transport and technological machines (TTM), which include transport equipment, as well as technological machines (excavators, loaders and other equipment that performs a technological process). The strategy of forming a system of maintenance and repairs taking into account the technical condition of TTM elements is described. The strategy provides for the division of structural elements of machines into four groups, depending on the principle approach to calculating the frequency of their repair. The criterion for determining the frequency of repairs is the probability of reaching the maximum values of characteristics during the inter-repair period, as well as the degree of criticality of the consequences of possible failure of the element.

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“…In the theory of recognition and forecasting, there are two main approaches to the problem of forecasting: probabilistic and deterministic (Repin et al, 2011;Jiang et al, 2014;Makhutov and Reznikov, 2015;Makhutov et al, 2013;Trukhanov, 2014).…”

Section: Predicting the Residual Resourcementioning

confidence: 99%

Substantiation of the Replacement Interval of Construction Machines by the Target Reliability Level

Repin

Zazykin

Кротова

2017

AEJ

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Integrated diagnostics of limit states and early warning of emergency conditions of structures

Cited by 8 publications

References 1 publication

Structural-Phase State, Mechanical Properties, Acoustic and Magnetic Characteristics in the Sustainable Deformation Localization Zones of Power Equipment Made of Structural and Heat Resistant Steels

Structural-Phase State, Mechanical Properties, Acoustic and Magnetic Characteristics in the Sustainable Deformation Localization Zones of Power Equipment Made of Structural and Heat Resistant Steels

Development of strategy for ensuring operability of transport and technological machines

Substantiation of the Replacement Interval of Construction Machines by the Target Reliability Level

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