Deformation and damage of nuclear power station fuel elements under cyclic loading

Breslavsky, Dmytro; Chuprynin, Aleksandr; Morachkovsky, Oleg; Tatarinova, Oksana; Pro, Will

doi:10.1177/0309324719874923

Cited by 14 publications

(10 citation statements)

References 25 publications

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“…The paper contains new results of the problem of fracture of solids under creep conditions and forced oscillations, which to the best of authors' knowledge have never been obtained before. The processes of the accumulation of hidden creep damage in solids under these conditions were formerly investigated (Breslavsky et al, 2014(Breslavsky et al, , 2019Lasan, 1949;Taira and Otani, 1986), but the problem of macrocrack development in the case of dynamic creep is solved for the first time. The proposed approach for solving the problem in consideration is based on the efficient technique for reducing the problem of creep under oscillating load into static one by means of asymptotic expansions and averaging over the period the problem.…”

Section: Discussionmentioning

confidence: 99%

Creep damage and fracture of notched specimens under static and fast periodic loading

Breslavsky

Senko

Tatarinova

2021

International Journal of Damage Mechanics

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Creep-damage processes in notched specimens subjected to static and periodic loading are studied experimentally. Subsequent simulations were carried out using Rabotnov evolution equation. In case of dynamic creep (fast periodic loading) the constitutive equations derived by use of asymptotic and averaging methods were used. Numerical results were obtained by the combination of FEM and predictor-corrector time integration scheme. Fracture process was studied using designed numerical procedure based on the elimination of the finite elements with critical values of damage parameter. The fracture times and directions of the crack propagation were determined. The qualitative difference between processes of crack propagation in cases of static and periodic loading were observed.

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Section: Discussionmentioning

confidence: 99%

Creep damage and fracture of notched specimens under static and fast periodic loading

Breslavsky

Senko

Tatarinova

2021

International Journal of Damage Mechanics

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“…Here, S Ф is a function of neutron fluence Ф, time, temperature, and parameters that determine the swelling process [16].…”

Section: Numerical Modeling Methodsmentioning

confidence: 99%

Determining the influence of irradiation swelling on creep and damage in elements with orthotropic material properties

Breslavsky

Mietielov

Tatarinova

2023

EEJET

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This paper reports a method that numerically models the deformation and accumulation of hidden damage in structural elements that are in an inhomogeneous thermal field and are exposed to radiation. Materials considered are those exhibiting orthotropy (transversal isotropy) of long-term properties. The problem is stated as an boundary – initial value one. To solve it, the finite element method and the initial-difference method of time integration are used. To simulate the anisotropy of the process of accumulation of hidden damage, a damage tensor is applied. The development of irradiation swelling strains is described using the equation for a limited temperature range and a specific fluence value. The results of numerical modeling of creep and damage in plates in tension with circular notches, which are in an inhomogeneous temperature field, are considered. The material of the plates is a titanium alloy VT1-0. It was found that the effect of irradiation significantly, up to 6‒7 %, increases the level of deformation in the plate. Radiation significantly, by almost 4 times, reduces the time until the completion of the hidden fracture of the plates. It was found that orthotropy of radiation swelling properties leads to redistribution of areas with significant strains and damage values. It has been established that the effect of irradiation swelling also qualitatively changes the nature of the distribution of maximum damage in the plate, which extends to a fairly large area. Such results are due to the additional effect of irradiation swelling strains on the rate of general irreversible deformation and redistribution of stresses

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“…In well-known papers, theoretical [9] and practical [10] issues related to the problem of creating and calculating the nodes of vibrating machines have been solved. At the same time, there is a lack of an integrated approach to the process of creating a vibrating machine that simultaneously fulfi lls the specifi ed requirements for rigidity and strength [11] of elastic elements, as well as simultaneously for the accuracy of reproducing the specifi ed vibrations of the working body.…”

Section: Introductionmentioning

confidence: 99%

Variation coefficient of torsional vibrations of the connection nodes of vibrating machines

Shpachuk¹,

Засядько²,

Suprun³

et al. 2021

Nauk. visn. nat. hirn. univ.

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Purpose. To formalize the dependence of the eigenfrequencies of translational and torsional vibrations of the structural elements of the vibrating machine articulated by the connection node on their design parameters and mechanical characteristics, as well as regulatory requirements for vibration activity, strength and accuracy. To develop a method for selecting the design parameters of the elastic band element of the package, taking into account the specified values of the amplitude and frequency characteristics of the dynamic loads reproduced by the supporting structure and the coefficient of variation of the natural frequencies of translational and torsional vibrations. Methodology. The research is based on fundamental approaches of applied mechanics, machine dynamics and vibration reliability. Findings. The dependences of the eigenfrequencies of torsional vibrations of the body parts of the vibrating machine connected by the connection node on their design parameters and mechanical characteristics are obtained and analyzed. Vibrations around an axis orthogonal to the working direction of the node are considered. A comparative analysis of the natural frequencies of the node in the direction of the transmitted vibration and its circular vibrations from the design parameters and mechanical characteristics of the elastic band elements, their number in the package and the number of packages in the connection node is performed. Originality. It is in the fact that for the first time the dependences describing the natural frequencies of translational and torsional vibrations of the body parts of a vibrating machine, articulated by a package of elastic band elements, are obtained. Also the paradigm for the choice of design parameters and mechanical characteristics of the elastic band element of the package, which is based on the results of a comparative analysis of the eigenfrequencies of vibrations in the working and connected directions through their coefficient of variation is innovative. This made it possible to include the criterion of vibration reproduction accuracy, which is formalized through the coefficient of frequency variation, together with the criteria of strength and rigidity, in the methodology of synthesis of the structural scheme of the vibrating machine. Practical value. The proposed methodological solutions for the calculation and selection of design parameters and mechanical characteristics of tape elastic elements ensure the achievement of vibration activity indicators of articulated parts, as well as the ratio of natural vibration frequencies in the working and related directions at the level of the requirements of normative documents when upgrading existing machines and creating new modern equipment. As a result, the reliability, durability, safety, productivity and load-bearing capacity of machines, equipment and mechanisms of mining engineering, aviation, transport and space technology are increased.

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Deformation and damage of nuclear power station fuel elements under cyclic loading

Cited by 14 publications

References 25 publications

Creep damage and fracture of notched specimens under static and fast periodic loading

Creep damage and fracture of notched specimens under static and fast periodic loading

Determining the influence of irradiation swelling on creep and damage in elements with orthotropic material properties

Variation coefficient of torsional vibrations of the connection nodes of vibrating machines

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