Diagnostics, Resource and Mechanics of materials and structures最新文献_第2页

Estimating the effect of the main design parameters on the effectiveness of high-purity hydrogen production from raw hydrocarbons in membrane catalytic devices 评价了膜催化装置中主要设计参数对原料烃制氢效率的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-08-01 DOI: 10.17804/2410-9908.2023.4.029-046

A. B. Vandyshev

引用次数: 0

The impact of flow induced by rotating magnetic fields on processes in a molten conductive medium 由旋转磁场引起的流动对熔融导电介质过程的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-06-01 DOI: 10.17804/2410-9908.2023.3.006-016

R. Khalilov, A. Mamykin, R. Okatev, I. Kolesnichenko

{"title":"The impact of flow induced by rotating magnetic fields on processes in a molten conductive medium","authors":"R. Khalilov, A. Mamykin, R. Okatev, I. Kolesnichenko","doi":"10.17804/2410-9908.2023.3.006-016","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.3.006-016","url":null,"abstract":"This paper studies a method of stirring liquid metal by the action of rotating magnetic fields using two ring inductors placed next to each other. These inductors generate magnetic fields rotating in opposite directions. The aim of this study is numerical investigation of the generated fluid flow and its impact on the homogenization of a two-phase medium, as well as on the crystallization process. The impact of these electromagnetic forces proves to cause the generation of intense poloidal flow component. The arising flow is accompanied by oscillatory motion of vortex structures and their interaction resulting in effective mixing of the liquid metal. The moderate values of the force parameter have been found to lead to the most homogeneous medium under stirring. Under non-stationary action, the force parameter modulations in a certain frequency range have practically no effect on the homogeneity occurrence time and the homogeneity value. The positive effect of stirring by magnetic fields of complex topology on the rate and homogeneity of metal solidification is stated. The obtained results are relevant for improving the quality of foundry ingots.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86172527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selecting a dependence for the approximation of experimental data on secondary creep and creep rupture strength 选择二次蠕变和蠕变断裂强度实验数据近似的依赖关系

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-06-01 DOI: 10.17804/2410-9908.2023.3.044-049

V. Nazarov

{"title":"Selecting a dependence for the approximation of experimental data on secondary creep and creep rupture strength","authors":"V. Nazarov","doi":"10.17804/2410-9908.2023.3.044-049","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.3.044-049","url":null,"abstract":"As a rule, for the evaluation of the mechanical characteristics of a metallic material by secondary creep and creep rupture strength, tests are carried out for uniaxial tension of cylindrical specimens under the influence of a stationary axial force. These mechanical characteristics include the experimental dependence of constant strain rate on nominal stress and the experimental dependence of rupture time on nominal stress. In order not to conduct a large number of experiments, so that these mechanical characteristics can be determined at any nominal stress, one of the two empirical dependencies is used, allowing the corresponding experimental dependences to be approximated with the smallest total error. As such empirical dependences, a power dependence with two material parameters and a fractional power dependence with four material parameters are considered, two of which acquire the definite physical meaning of starting creep stress (the maximum stress at which the strain rate is zero) and break creep stress (the minimum stress at which instantaneous rupture occurs). When choosing an empirical dependence, the author used experimental data obtained by him from mechanical tests for uniaxial tension of cylindrical VT5 and VT6 titanium alloy specimens at 650 °C. The calculated total errors testify that both empirical dependences satisfactorily approximate the considered experimental data.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82474046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Based on the temperature correlation principle, the use of a magnetic obstacle to generate pulsations in the flow measurement of a liquid metal coolant 基于温度相关原理，利用磁阻产生脉动对液态金属冷却剂进行流量测量

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-06-01 DOI: 10.17804/2410-9908.2023.3.017-028

A. Mamykin, R. Khalilov, E. Golbraikh, I. Kolesnichenko

引用次数: 0

Thermophysical properties of a Cu–Ti–C–B SHS composite Cu-Ti-C-B SHS复合材料的热物理性质

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-06-01 DOI: 10.17804/2410-9908.2023.3.050-065

N. Pugacheva, T. Bykova, E. Senaeva, L. Goruleva

{"title":"Thermophysical properties of a Cu–Ti–C–B SHS composite","authors":"N. Pugacheva, T. Bykova, E. Senaeva, L. Goruleva","doi":"10.17804/2410-9908.2023.3.050-065","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.3.050-065","url":null,"abstract":"The paper studies the thermophysical properties of a Cu-Ti-C-B composite produced by self-propagating high-temperature synthesis (SHS) of an initial mixture of copper, titanium, boron carbide (B4C), and carbon powders. The matrix of the composite is a supersaturated solid solution of titanium in a copper lattice with Cu4Ti nanosized particles homogeneously precipitated under cooling. The matrix microhardness is 450 HV 0.1. Particles of titanium carbide (TiC) and titanium diboride (TiB2) resulting from SHS are randomly distributed in the bulk of the composite. The microhardness of the regions with the predominance of TiC particles is 640 HV 0.1, and the microhardness of the regions with the predominance of TiB2 particles is 900 HV 0.1. The average hardness of the composite is 60 HRC. Differential scanning calorimetry demonstrates a unified wide exothermic effect at temperatures ranging from 750 to 1000 °С, with an enthalpy of 148.6 J/g, associated with the exothermic reaction between residual titanium and boron carbide (B4C), which did not react during SHS. The temperature dependences of density, thermal diffusivity, heat capacity, thermal conductivity, and the coefficient of linear thermal expansion are experimentally determined. The particles of the strengthening phases are found to reduce slightly the thermal properties of the composite compared to pure copper. It is shown that annealing at temperatures of 800 and 860°C decreases the level of residual stresses in the composite matrix.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86198310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of the chemical activity of the implanted element to metal alloy components on the formation of surface layers under ion irradiation 离子辐照下注入元素对金属合金成分化学活性对表层形成的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-06-01 DOI: 10.17804/2410-9908.2023.3.029-043

V. L. Vorobyev, P. Bykov, S. G. Bystrov, A. Kolotov, V. Bayankin

引用次数: 0

The impact of bridge crossing span damage under moving load 移动荷载作用下桥梁跨跨损伤的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-04-01 DOI: 10.17804/2410-9908.2023.2.065-074

V. Korepanov, T. Korepanova, R. Tsvetkov

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Analytical and numerical radially symmetric solutions to a heat equation with arbitrary nonlinearity 任意非线性热方程的解析和数值径向对称解

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-04-01 DOI: 10.17804/2410-9908.2023.2.049-064

A. L. Kazakov, L. Spevak

{"title":"Analytical and numerical radially symmetric solutions to a heat equation with arbitrary nonlinearity","authors":"A. L. Kazakov, L. Spevak","doi":"10.17804/2410-9908.2023.2.049-064","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.2.049-064","url":null,"abstract":"The paper deals with the construction of radially symmetric heat waves, which are solutions to the heat conduction equation with an arbitrary form of nonlinearity under nonzero boundary condition specified on a moving manifold. The boundary value problem under study is a generalization of those solved by us earlier. Firstly, the class of the considered parabolic equations is extended; secondly, the boundary condition generating a heat wave in a space of arbitrary dimensionality has a more general form. A new theorem of the existence and uniqueness of the heat-wave-type analytical solution is proved for this problem. An approximate method of constructing solutions of the required form is proposed, which is based on expansion in radial basis functions combined with the collocation method. At each time step, the solution is constructed in two stages. The first stage is solving a problem in the region bounded by a specified moving manifold and a heat wave front, which is a priori unknown and evaluated during solving. Herewith, a special substitution is used, i.e. the required function and the spatial variable change their roles. In the second stage, the solution is completed in the region bounded by the positions of the specified moving manifold on a current step and at the initial time. The boundary conditions are defined from the first-step solution. In the test example, the solutions constructed by the developed algorithm are compared with the known exact solution. Calculations show a good accuracy of the numerical solutions at various values of the numerical parameters, including space dimensionality. The observed numerical convergence with respect to the time step shows the correctness of the proposed computational procedure.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88553837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ensuring safe operation of monolithic structures in undermined areas 确保破坏区域整体结构的安全运行

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-04-01 DOI: 10.17804/2410-9908.2023.2.006-018

G. Gusev, A. Baryakh, I. Shardakov, R. Tsvetkov

{"title":"Ensuring safe operation of monolithic structures in undermined areas","authors":"G. Gusev, A. Baryakh, I. Shardakov, R. Tsvetkov","doi":"10.17804/2410-9908.2023.2.006-018","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.2.006-018","url":null,"abstract":"In order to ensure safe operation of buildings in undermined areas, it is necessary to take into account the influence of loads extrinsic to typical structures. The solution of the generalized boundary value problem on the evaluation of the stress-strain state (SSS) of the building–foundation–soil system with due regard for the complete geometry and physically nonlinear behavior of all the elements is inexpedient since it is complicated by the large dimensionality of the problem. This paper discusses an approach allowing the state of monolithic reinforced concrete building structures located in an undermined area to be estimated by solving boundary value problems on different scales, from modeling the whole system in an elastic formulation to modeling joints between load-bearing members (columns and floors) in a nonlinear formulation for concrete and reinforcement. In these problems, strain energy is taken as the parameter characterizing the deformation process at critical deformation stages and connecting the boundary value problems. The obtained loading diagrams for a unit and the evaluation of the SSS of the whole structure enable one to find the values of maximum permissible horizontal soil deformations in the vicinity of the foundation, at which the bearing members reach the SSS preceding the loss of bearing capacity.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90417463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Studying the mechanical properties of iron ore concentrate briquettes 对铁精矿型煤的力学性能进行了研究

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-04-01 DOI: 10.17804/2410-9908.2023.2.041-048

L. I. Polyansky, N. Babailov, Y. Loginov

{"title":"Studying the mechanical properties of iron ore concentrate briquettes","authors":"L. I. Polyansky, N. Babailov, Y. Loginov","doi":"10.17804/2410-9908.2023.2.041-048","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.2.041-048","url":null,"abstract":"This paper studies the properties of metallurgical briquettes of iron ore concentrate with coke screenings and liquid glass as a binder. The briquettes are produced by one-sided pressing in a closed die mounted on the plates of a vertical press with a force of 100 kN. The studies were carried out in the laboratory of Spidermash LLC. The following properties of briquettes were determined: density, impact strength and compressive strength (for green and dry briquettes). The functional dependences of the mechanical properties on 4 parameters are plotted, namely on charge mixture composition (the content of iron ore concentrate and coke), binder (liquid glass) percentage in the mixture, moisture content in the mixture, and charge mixture compacting pressure. The obtained experimental data are approximated with the use of a multiplicative model, with the application of the least squares method. Various analytical models for describing the behavior of the material to be briquetted are studied. It is concluded that the multiplicative model provides a more adequate description of the mechanical properties. The quality of the multiple regression model is assessed by the adjusted coefficient of determination. The significance of the regression equation is evaluated by the Fisher criterion, and the significance of the regression coefficients is evaluated according to Student. The mechanical properties of briquettes from iron ore concentrate with coke screenings, presented in the form of analytical dependencies, are necessary to assess the strength of the briquettes when designing the briquetting process. For example, it is necessary to take into account the change in yield during briquette transportation after briquetting. These dependences are also necessary for formulating and solving problems of pressing/briquetting of finely dispersed materials, including iron ore concentrate with coke screenings.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88256444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0