Diagnostics, Resource and Mechanics of materials and structures最新文献_第5页

High-frequency electrodynamics and mechanics of anisotropic media 各向异性介质的高频电动力学和力学

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-10-01 DOI: 10.17804/2410-9908.2022.5.015-022

A. Druzhinin

引用次数: 0

An analytical and numerical study of free boundary dynamics for an isolated mass of a self-gravitating gas 自重力气体孤立质量的自由边界动力学分析与数值研究

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-08-01 DOI: 10.17804/2410-9908.2022.4.061-080

A. Kazakov, L. Spevak, N. Chuev

{"title":"An analytical and numerical study of free boundary dynamics for an isolated mass of a self-gravitating gas","authors":"A. Kazakov, L. Spevak, N. Chuev","doi":"10.17804/2410-9908.2022.4.061-080","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.4.061-080","url":null,"abstract":"The paper considers an evolution of the free boundary of a finite volume of a self-gravitating ideal gas moving in the vacuum. Unsteady flows are described by a phenomenological mathematical model, which has the form of a system of nonlinear Volterra integro-differential equations written in Eulerian coordinates. The gas volume moves in a force field generated by the Newtonian potential in general form. The boundary conditions are specified on the free gas-vacuum boundary, which is a priori unknown and determined simultaneously with gas flow construction. Conversion to Lagrangian coordinates allows us to reduce the original problem to an equivalent one, which consists of Volterra integral equations and the continuity equation in Lagrangian form, with Cauchy conditions specified for all these equations. Therefore, the application of Lagrangian coordinates makes it possible, in particular, to eliminate the unknown boundary. The theorem of the existence and uniqueness of the solution in the space of infinitely differentiable functions is proved for this problem. The free boundary is determined as an image of the surface bounding the gas-filled region in reverse transition. Herewith, the method for studying the free boundary is similar to the approach that the authors apply to studying the dynamics of the rarefied mass of a self-gravitating gas. Nu-merical calculations of gas flow are made, including the construction of the free gas-vacuum boundary. The influence of gravitation and the initial gas particle velocity on the formation of gas cloud configuration in the vacuum and on cloud evolution is studied. The results are of interest in terms of solving relevant astrophysical and cosmogonic problems.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78918148","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

Comprehensive evaluation of fatigue damage accumulation and failure of specimens with operational stress concentrators 带操作应力集中器试件疲劳损伤累积与破坏的综合评价

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-08-01 DOI: 10.17804/2410-9908.2022.4.037-049

Е. М. Strungar, О. А. Staroverov, Е. М. Lynegova

引用次数: 0

Experimental facility for studying the physical properties of materials in a plane stress state 研究材料在平面应力状态下的物理性质的实验装置

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-08-01 DOI: 10.17804/2410-9908.2022.4.050-060

A. N. Mushnikov, S. M. Zadvorkin, E. N. Perunov, S. V. Vyskrebentsev, R. F. Izmailov, D. Vichuzhanin, N. Soboleva, A. S. Igumnov

引用次数: 0

Studying supercritical deformations of flat ellipsoidal panels of constant thickness 等厚扁平椭球板的超临界变形研究

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-08-01 DOI: 10.17804/2410-9908.2022.4.081-089

V. V. Chupin, D. E. Chernogubov

引用次数: 0

Estimating the effect of some individual technological factors on the effectiveness of producing high-purity hydrogen from hydrocarbons in catalytic membrane devices 评价了个别工艺因素对膜催化装置中烃类制取高纯氢效果的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-08-01 DOI: 10.17804/2410-9908.2022.4.006-036

A. B. Vandyshev

引用次数: 0

Increasing hydrogen sorption by ti2ni powder using mechanochemical alloying 机械化学合金化提高ti2ni粉末的吸氢性能

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-06-01 DOI: 10.17804/2410-9908.2022.3.025-035

E. Abdulmenova, S. Buyakova, S. Kulkov

{"title":"Increasing hydrogen sorption by ti2ni powder using mechanochemical alloying","authors":"E. Abdulmenova, S. Buyakova, S. Kulkov","doi":"10.17804/2410-9908.2022.3.025-035","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.3.025-035","url":null,"abstract":"A method has been developed to increase hydrogen sorption by Ti2Ni powder, which consists in mechanochemical alloying by titanium of Ti-Ni powder near the equiatomic composition. This method allows the hydrogen content in the powder material to be increased several times. It is possible to use the developed powder material for the safe storage and transportation of hydrogen in the metal hydride with a high hydrogen content, with reversible adsorption of hydrogen, in comparison with the storage and transportation of hydrogen in compressed and liquid form. The developed method is simple to implement and low-cost; therefore, it is of economic and practical interest. For mechanochemical alloying, a high-intensity planetary ball mill was used, with a drum rotation speed of 1820 rpm and a processing time of 300 seconds. It is shown that, after mechanochemical alloying, the powder Ti-Ni (85 wt%) – Ti (15 wt%) powder consisted of TiNi in two modifications, namely B2 and B19`, and two Ti2Ni phases with different lattice parameters. The existence of two Ti2Ni phases is due to both the inheritance of this phase from the initial Ti-Ni powder (Ti2Ni(I)), and its formation during the interaction of titanium with TiNi (B2, B19`) in the process of mechanochemical alloying (Ti2Ni(II)). The Ti2Ni (II) phase formed by mechanochemical alloying is more prone to interact with hydrogen with the formation of Ti2NiHx hydride than the Ti2Ni (I) phase present in Ti-Ni powder before alloying. The lattice parameter of the Ti2Ni (II) phase increases by 17.6 % during hydrogenation and corresponds to Ti2NiH2.8 hydride; this result exceeds the change in the cell volume of Ti2Ni obtained by other methods.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80236092","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

Unidirectional steady-state inhomogeneous Couette flow with a quadratic velocity profile along a horizontal coordinate 沿水平坐标的二次速度剖面的单向稳态非均匀库埃特流

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-06-01 DOI: 10.17804/2410-9908.2022.3.047-060

L. Goruleva, E. Prosviryakov

{"title":"Unidirectional steady-state inhomogeneous Couette flow with a quadratic velocity profile along a horizontal coordinate","authors":"L. Goruleva, E. Prosviryakov","doi":"10.17804/2410-9908.2022.3.047-060","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.3.047-060","url":null,"abstract":"The paper presents an exact solution to the boundary value problem describing the steady-state unidirectional flow of a viscous incompressible fluid. The fluid moves in an infinite horizontal strip (infinite fluid layer). The fulfillment of the no-slip condition is postulated at the lower boundary of the viscous fluid layer. At the upper boundary, which is assumed to be rigid, non-uniform velocity distribution is specified. The deformation of the free boundary is neglected due to the use of the rigid-lid boundary condition. The exact solution to the equations of the hydrodynamics of incompressible fluids automatically satisfies the continuity equation (the incompressibility equation). The velocity function is harmonic in this case. The simplest exact solution satisfying the Laplace equation is constructed, which takes into account the features of the velocity field along the transverse (vertical) coordinate and one of the longitudinal (horizontal) coordinates. The paper analyzes the topological properties of the velocity field, the tangential stress field, the vorticity vector, specific kinetic energy, and specific helicity.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80449843","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

Calculating the probability of the failure-free operation of spur gear transmissions 计算正齿轮传动装置无故障运行的概率

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-06-01 DOI: 10.17804/2410-9908.2022.3.013-024

S. Lebedev, V. Syzrantsev

{"title":"Calculating the probability of the failure-free operation of spur gear transmissions","authors":"S. Lebedev, V. Syzrantsev","doi":"10.17804/2410-9908.2022.3.013-024","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.3.013-024","url":null,"abstract":"The article presents an improved method for calculating the probability of failure-free operation of case-hardened spur gear transmissions. The existing methods for calculating the probability of failure-free operation of gear transmissions are analyzed. The failure tree for a case-hardened spur gear transmission is presented. The probability of failure-free operation of case-hardened cylindrical gear transmissions is presented as the product of the probabilities of failure-free operation of the gear and the wheel according to the following criteria (failure types): contact endurance (pitting), bending endurance (tooth breakage), and tooth interior fatigue fracture (deep contact chipping). An algorithm has been developed for calculating the probability of failure-free operation of case-hardened spur gear transmissions. To restore the torque distribution density function in the proposed method, nonparametric statistics methods are implemented. In the calculation of contact stresses, the skew angle is taken into account, which is the sum of two angles: the skew angle due to deformations of the transmission elements and the housing; the total angle of technological misalignment of wheel tooth surfaces, caused by errors in the manufacture of the teeth and mounting errors during the assembly of the transmission. An example of a test calculation of the probability of failure-free operation of a case-hardened spur gear transmission according to the presented method is given. Based on the work performed, conclusions are formulated.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83467495","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

Investigation of butadiene-elastomer-based high modulus materials reinforced by basalt, glass, and carbon fabrics 玄武岩、玻璃和碳织物增强丁二烯弹性体高模量材料的研究

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-06-01 DOI: 10.17804/2410-9908.2022.3.006-012

M. M. Kopyrin, A. E. Markov, A. A. Dyakonov, А. G. Tuisov, А. Okhlopkova, A. Kychkin, N. Lazareva

{"title":"Investigation of butadiene-elastomer-based high modulus materials reinforced by basalt, glass, and carbon fabrics","authors":"M. M. Kopyrin, A. E. Markov, A. A. Dyakonov, А. G. Tuisov, А. Okhlopkova, A. Kychkin, N. Lazareva","doi":"10.17804/2410-9908.2022.3.006-012","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.3.006-012","url":null,"abstract":"A relevant task in improving the properties of elastomers is to increase their strength and stiffness, which affect the reliability and durability of rubber products. The paper presents a technology for manufacturing high-modulus materials based on SKD-V butadiene rubber and reinforcing layers of fabrics from basalt, glass, and carbon fibers. The results of studying elastic strength properties reveal a significant increase in the ultimate strength of reinforced samples in comparison with an unmodified elastomer. The increase in tensile strength varies from 1.7 to 2.8 times. The addition of reinforcing layers reduced the elongation value by 25 to 47 times compared to rubber without reinforcement. High tensile strength and low elongation increase shear resistance. The wear resistance testing of elastomers coated with reinforcing fabrics shows a decrease in abrasion resistance reduced by a factor of 5.8. Abrasion wear and interaction between the reinforcing filler and the polymer are studied by electron microscopy. The study of the microstructure shows a weak contact between the fiber and the elastomeric matrix. Lack of contact during the abrasion process causes destruction of the fibers on the abrasive surface and their further separation. Due to the combination of high tensile strength and low elongation, the reinforced materials obtain high modulus properties combined with lateral mobility.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87032254","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