The influence of quasi-static loading regimes on the strength of vessels operating under pressure

Kovshova, Yu S.; Кузеев, И.Р.; Naumkin, E.A.; Махутов, Н. А.; Гаденин, М. М.

doi:10.1134/s0020168515150091

Cited by 16 publications

(5 citation statements)

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“…A fairly large number of works are currently devoted to the problem of investigating the occurrence of damage in the coils of tubular furnaces and ensuring reliable and safe further operation of them. [1][2][3][4][5][6][7] Most often, various damages and deviations are observed in coils that are operated in radiant chambers. Simultaneous exposure to overpressure, elevated temperatures, working medium, etc.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stress-strain state of coil of tubular furnace radiant chamber at different arrangement of intermediate support

Kovshova,

Rubtsov,

Chen

2023

J. Phys.: Conf. Ser.

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The coils of radiant chambers of tubular furnaces are operated under especially loaded conditions in terms of temperature stress distribution. It is in the radiant sections that the feed is heated to the required maximum temperatures. Also, part of the coil structure may be in close proximity to the burners and exposed to an open flame to form superheating zones. In this regard, the elements of the coil can deform and prematurely collapse. One of the most important roles is played by the support elements of the coil in the form of suspensions, brackets, etc., which serve to prevent sagging of the coil pipes. An important role is played by the optimal location of the support elements of the coils during design in order to prevent pipe sagging during operation. In the era of rapidly developing digital technologies, the problem of optimal location of support elements at the coil, taking into account the peculiarities of the design, operating parameters, and the intensity of thermal radiation, can help solve specialized software complexes. Special programs develop a coil model taking into account all the necessary parameters and characteristics, both material and technological process. This makes it possible to detect zones of concentration of increased stresses and maximum deformations. Therefore, the actual work is the modeling of the stress-strain coil of the radiant coil, taking into account the different locations of the support elements.

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Section: Introductionmentioning

confidence: 99%

Investigation of stress-strain state of coil of tubular furnace radiant chamber at different arrangement of intermediate support

Kovshova,

Rubtsov,

Chen

2023

J. Phys.: Conf. Ser.

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“…One of the most important activities aimed at prevention of equipment failure is technical diagnosis and forecasting of residual life performed within the framework of industrial safety expert review. Their relevance is currently increasing, since according to various data, depreciation of fixed assets of oil and gas refineries is up to 50% [2].…”

Section: Introductionmentioning

confidence: 99%

Damage Assessment of Specimens Made of Steel 09G2S Exposed to Low-Cycle Fatigue with the Help of Acoustic Emission Monitoring Method

Valiev

Khalikova

Кузеев

2020

MSF

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Cyclic impact of external parameters on the structure, such as the daily change of temperature, change of operating parameters (pressure, temperature, volumes of loaded raw material) may lead to the brittle fracture of the equipment material with fast propagation of the main crack. In view of this, there is a need to use the nondestructive test methods which allow determining the critical level of damage accumulation. The article considers the pattern of change in properties as a result of low-cyclic loading by studying the parameters of acoustic signal. Changes in acoustic emission (AE) parameters were measured in the process of uniaxial tension of specimens with different degrees of accumulated damage. Upon processing of these AE parameters, stages of damage accumulation in cyclic fatigue were determined. Thus, is was determined that acoustic-emission diagnostics is sensitive to the said changes and may be used for assessment of the damage degree of 09G2S steel specimens.

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“…Development of this idea is widely reflected not only in the works of modern Russian scientists [8,[14][15][16][17][18][19][20][21][22][23][24], but also in the works of our foreign colleagues [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Multifractal Parametrization of Welded Joints Structure as an Instrument of Diagnostics and Detection of Defects

Poyarkova

Кузеев

2017

SSP

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In each particular material the hierarchical peculiarities of defects indicate the corresponding hierarchical peculiarities of mechanisms of damage and limit states accumulation. In accordance with the points of view of V.S. Ivanova, V.V. Bolotin, A.A. Shanyavsky, L.I. Tushinsky, O.B. Naymark, V.V. Lepov, A.A. Bataev, the occurrence of the limiting state on a particular structural level is possible in case of accumulation on it of the ultimate concentration of defects of a certain kind. In such case the “established system” gets a new, additional degree of freedom, which promotes change of the prevailing mechanism of damage accumulation. The acceptability of this concept has been previously determined for a limited range of materials, which usually don’t have evident structural and mechanical heterogeneity. Thus, the extension of available results to the structurally heterogeneous materials and especially to the welded joints of such materials turned out to be a very difficult task. However, the concept of maximum (critical) level of damage accumulation on a particular scale level was introduced not so long ago. When assessing structural and mechanical heterogeneities of the structural material, an important role is played by concepts of similarity of mechanical phenomena, self-similarity of deformation and destruction processes and by the scale factor of reliability, which are considered in their historical development as a part of application of fractal concepts in the materials science. The application of complex synthesized approach (consisting of a set of diagnostic methods in the form of scanning electron microscopy and multifractal parametrization of materials microstructures) for detection of potentially hazardous zones of welded joints with the highest level of structural and mechanical heterogeneity was the main ideology of our study. In order to establish the cause-and-effect relationships of appearance of “macro-corrugations” on the surface of the material, the analysis of the structure of heterogeneous welded joints represented as a hierarchically organized system was performed.

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The influence of quasi-static loading regimes on the strength of vessels operating under pressure

Cited by 16 publications

References 0 publications

Investigation of stress-strain state of coil of tubular furnace radiant chamber at different arrangement of intermediate support

Investigation of stress-strain state of coil of tubular furnace radiant chamber at different arrangement of intermediate support

Damage Assessment of Specimens Made of Steel 09G2S Exposed to Low-Cycle Fatigue with the Help of Acoustic Emission Monitoring Method

Multifractal Parametrization of Welded Joints Structure as an Instrument of Diagnostics and Detection of Defects

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