System analysis of the modern materials and technologies in power engineering and industry for the Russian North and Arctic

Lepov, Valeriy; Petrov, Nikolay V.; Pavlov, N.V.

doi:10.1063/5.0112831

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Имеющиеся наработки в области конструкционного материаловедения (физики прочности, механики деформирования и разрушения, физикохимических основ металловедения, механики структурно-неоднородных материалов) и моделирования технологических взаимосвязанных механических и физико-химических процессов в экстремальных условиях низких температур и фазовых переходов могут послужить основой для комплексного решения проблемы обеспечения техногенной безопасности сложных технических систем [2].…”

Section: хрупкое разрушение и безопасностьunclassified

“…К композиционным материалам (четверть всех публикаций) отнесены здесь полимерные, металлические, (металло)керамические материалы, волокна и добавки, аэрогели, базальто-и углепластики. Вторая по числу публикаций область включает в себя материалы, полученные с помощью аддитивных технологий, это в первую очередь 3D-и 4D-печать, но также и 5D-печать, в том числе живых тканей, когда за счет получения специфической поверхностной и внутренней структуры материала становится возможным достижение синергетических, системных бионических эффектов [2]. Третье место по числу публикаций неожиданно заняли умные материалы.…”

Section: Introductionunclassified

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Materials Science of the North and the Artic for the industry of the Republic of Sakha (Yakutia)

Lepov,

Okhlopkova

2024

jour

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An overview of the research in the field of Northern and Arctic Materials sciences is provided, including the design and safe operation of materials for complex technical systems in extreme environments. The discussion covers the fundamental principles of material design, including structure at different levels of organization and scales, and the development of theoretical and numerical models. Additionally, the optimal ratios of components and technological stages are discussed to obtain specific properties such as corrosion resistance, wear, cold and frost resistance, strength, and plasticity. These efforts aim to ensure the reliable operation and resource efficiency of machines and structures in harsh arctic and subarctic conditions.

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Section: хрупкое разрушение и безопасностьunclassified

Section: Introductionunclassified

Materials Science of the North and the Artic for the industry of the Republic of Sakha (Yakutia)

Lepov,

Okhlopkova

2024

jour

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Study of the mechanical behavior and multiscale simulation of the crack propagation in a bilinga wooden beam

Bisong,

Lepov,

Etinge

2024

Zavod. lab., Diagn. mater.

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The mechanical behavior of local wood species (Bilinga) in the south west region in Cameroon during rainy and dry seasons and the mechanical behavior of wooden beam under bend loading are studied. The three points flexural tests were used to determine the mechanical properties of the wood under study. ANSYS 2020 R1 finite element (FE) software is used for numerical simulations at a macroscopic level using one of the newer technologies called Smart crack growth, which was introduced in the 2019 version. The geometry was modeled in SolidWorks with an initial crack length of 4 and 8 mm introduced in each sample and then imported to ANSYS workbench for further analysis with ANSYS which has all the tools to perform linear fracture. The stress intensity factor (SIF) determines the fracture toughness of a material which is subjected to linear-elastic fracture mechanics (LEFM) where a variable of the critical stress intensify is denoted as KIc. The fatigue crack growth was modeled using Paris’ law. The crack growth was simulated based on Mode I crack specimen with an initial crack length of 4 and 8 mm, respectively. The stochastic multiscale modeling of crack growth on meso- and microscale is used to compare the crack growth rate in the approach of a heterogeneous material and taking into account the microstructure and fracture mechanism of the Bilinga wood. The results of stochastic modeling of the crack growth in the array of cracks and pores of a characteristic size shows that the simulation is close to FE-modeling results. Therefore, the stochastic simulation of the crack growth in wood at meso- and microscale shows the lower local stress intensity factors and slower crack growth due to the existence of the scale-time hierarchy. The crack growth rate vcr at a macroscale ranges within 0.845 – 0.9 × 10–3 m/sec which corresponds to the macroscopic value of the fracture toughness KIc.

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Foundation of multilevel apploach to fracture modeling for materials with submicrostructure applicable for Arctic and Subarctic environment

Lepov

Bisong

Golykh

2023

jour

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A short review of research on multiscale modeling of the fracture processes of heterogeneous materials with submicrostructures applicable to Arctic and Subarctic environments is presented. The results of solving a number of model problems, both in terms of macroscopic strength and main crack growth, and describing the accumulation of microscopic defects and hierarchical fracture processes by the mechanisms of formation, growth, and fusion of secondary and microcracks, and microscopic pores are provided. Thus, for the fracture process of samples of porous concrete modified with oil palm fruit fibers to improve its consumer qualities, a simulation of crack growth was conducted, which showed a decrease in the crack resistance of the material with increasing fiber content. A three-point bend test was used to evaluate the bending strength and modulus of elasticity, and the compressive strength and modulus of elasticity were determined. An increase in the fiber content led to a decrease in the compressive strength and modulus of elasticity. The fracture surface analysis revealed the mechanism of crack propagation through the coalescence of micropores. The basis of the modeling was an experimentally substantiated criterion for concentrated fractures during crack formation based on percolation theory. Macroscopic finite-element and stochastic modeling of fractures during the bending of a beam made of wood have also been carried out. For wooden structures, the peculiarity is the anisotropic behavior of the material in the loading direction. The structure of the Bilinga tree timber at the mesoscopic and microscale levels was considered, and a hierarchy of the spatial and temporal scales of the fracture process was constructed. The crack growth rates at different scales were determined and compared with macroscopic FE simulations. Another task was to determine the dependence of the crack growth rate in the soil, such as regolith, under the influence of an ultrasonic impactor. Stochastic modeling of the crack growth in the array of micropores revealed the crack growth rate dependence on the ultrasonic transmitter beater parameters and pulse amplitude.

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System analysis of the modern materials and technologies in power engineering and industry for the Russian North and Arctic

Cited by 3 publications

References 7 publications

Materials Science of the North and the Artic for the industry of the Republic of Sakha (Yakutia)

Materials Science of the North and the Artic for the industry of the Republic of Sakha (Yakutia)

Study of the mechanical behavior and multiscale simulation of the crack propagation in a bilinga wooden beam

Foundation of multilevel apploach to fracture modeling for materials with submicrostructure applicable for Arctic and Subarctic environment

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