Diagnostics, Resource and Mechanics of materials and structures最新文献_第3页

Applying the method of virtual elements to solving contact problems of shells of revolution interacting with surfaces of inconsistent shape 应用虚元法求解旋转壳体与非一致形状曲面相互作用的接触问题

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-04-01 DOI: 10.17804/2410-9908.2023.2.019-040

I. Emelyanov

{"title":"Applying the method of virtual elements to solving contact problems of shells of revolution interacting with surfaces of inconsistent shape","authors":"I. Emelyanov","doi":"10.17804/2410-9908.2023.2.019-040","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.2.019-040","url":null,"abstract":"An approach based on the method of virtual elements is used to solve the contact problem for a thin shell of revolution lying on a rigid foundation. In this case, the surface of the base has a shape inconsistent with the surface of the shell. The method makes it possible to determine the contact area and the contact pressure from the contact area unknown in two coordinate directions. Since the contact area is not known in advance, the problem is structurally nonlinear. A thin isotropic shell is described by the classical theory based on the Kirchhoff–Love hypotheses. The base is taken absolutely rigid, but with the presence of an elastic gasket. The shell equations are integrated by S. K. Godunov’s method of discrete orthogonalization. To determine the forces of interaction between the shell and the base, a mixed method of structural mechanics is used. With this aim in view, the maximum possible contact area is discretized by virtual rectangular elements. A constant value of the contact pressure is assumed on each element obtained in this area, and the contact pressure is assumed to be zero on the elements in the area where the shell leaves the base. Based on the assumptions, a system of linear algebraic equations is constructed, which determines the contact pressure and deflection of the shell circumference axis. Since the shell can move away from the base, iterative procedures are applied to search for the real contact area, which depends on the geometric and elastic parameters of the shell and the magnitude of the external load. As an example, the contact interaction of a cylindrical shell (part of the shell of a tank car) lying on a rigid base with a gasket is considered. It is shown how the contact area and contact pressure change depending on the rigidity of the gasket and the difference between the radii of the shell and the base (inconsistency in the shape of the surfaces).","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":"83655036","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

Detection of prefracture zones in structural materials by magnetic and optical methods 磁性和光学方法检测结构材料的断裂前区

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-02-01 DOI: 10.17804/2410-9908.2023.1.024-040

Yu. V. Khudorozhkova, S. M. Zadvorkin, S. V. Burov, I. Kamantsev

引用次数: 0

Effect of hardeners on the mechanical properties of epoxy coatings based on ED-20 resin 硬化剂对ED-20树脂环氧涂料力学性能的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-02-01 DOI: 10.17804/2410-9908.2023.1.006-016

S. Smirnov, I. Veretennikova, D. Konovalov, N. Michurov, V. Osipova, A. Pestov

引用次数: 0

Fracture of a thin-walled spherical vessel affected by internal pressure 受内压影响的薄壁球形容器断裂

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-02-01 DOI: 10.17804/2410-9908.2023.1.017-023

V. V. Struzhanov, A. Chaikin

引用次数: 0

The effect of abrasive additives on the tribotechnical properties of lubricants for the wheel–rail system 磨料添加剂对轮轨系统润滑油摩擦学性能的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-02-01 DOI: 10.17804/2410-9908.2023.1.054-064

L. F. Koroleva, R. Savrai, E. Prosviryakov, V. A. Kostarev, S. V. Pavlyshko, P. V. Kostarev

引用次数: 0

Exact solutions to the Navier–Stokes equations for describing inhomogeneous isobaric vertical vortex fluid flows in regions with permeable boundaries 描述具有可渗透边界区域内非均匀等压垂直涡旋流体流动的Navier-Stokes方程的精确解

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2023-02-01 DOI: 10.17804/2410-9908.2023.1.041-053

L. Goruleva, E. Prosviryakov

{"title":"Exact solutions to the Navier–Stokes equations for describing inhomogeneous isobaric vertical vortex fluid flows in regions with permeable boundaries","authors":"L. Goruleva, E. Prosviryakov","doi":"10.17804/2410-9908.2023.1.041-053","DOIUrl":"https://doi.org/10.17804/2410-9908.2023.1.041-053","url":null,"abstract":"A family of exact solutions to the Navier–Stokes equations is constructed to describe nonuniform two-dimensional fluid motions. The superposition of the main unidirectional flow with the secondary flow is considered. The secondary flow is determined by suction or injection through permeable boundaries. This class of exact solutions is obtained by multiplicative and additive separation of variables. The flow of a viscous incompressible fluid is described by a polynomial of the horizontal (longitudinal) coordinate. The polynomial coefficients are functions of the vertical (transverse) coordinate and time. They are determined by a chain of homogeneous and inhomogeneous parabolic partial differential equations with a convective term. In the case of a steady flow, it is described by a system of ordinary differential equations with constant coefficients. An algorithm for integrating a system of ordinary differential equations for studying the steady motion of a viscous fluid is presented. In this case, all the functions defining the velocity are quasipolynomials since the system of ordinary differential equations has an Euler-form exact solution.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84530581","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

Effect of plastic deformation on the phase composition and electromagnetic characteristics of the 321N austenitic steel (08Kh18N10T) 塑性变形对321N奥氏体钢(08Kh18N10T)相组成及电磁特性的影响

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-12-01 DOI: 10.17804/2410-9908.2022.6.095-106

L. Goruleva, S. M. Zadvorkin, A. N. Mushnikov

引用次数: 0

Production of metal matrix composites based on aluminum-manganese bronze and nickel alloys by wire feed electron-beam additive manufacturing 铝锰青铜和镍合金金属基复合材料的丝送电子束增材制造

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-12-01 DOI: 10.17804/2410-9908.2022.6.065-075

A. Chumaevsky, A. Panfilov, K. Kalashnikov, A. Zykova, T. Kalashnikova, A. Vorontsov, S. Nikonov, E. Moskvichev, V. Semenchuk, V. Е. Rubtsov, E. Kolubaev

{"title":"Production of metal matrix composites based on aluminum-manganese bronze and nickel alloys by wire feed electron-beam additive manufacturing","authors":"A. Chumaevsky, A. Panfilov, K. Kalashnikov, A. Zykova, T. Kalashnikova, A. Vorontsov, S. Nikonov, E. Moskvichev, V. Semenchuk, V. Е. Rubtsov, E. Kolubaev","doi":"10.17804/2410-9908.2022.6.065-075","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.6.065-075","url":null,"abstract":"Samples of composite materials based on BrAMts9-2 bronze with the introduction of the Udimet500 and Inconel625 nickel alloys were obtained by wire-feed electron-beam technology. The studies show that the structures of composites formed during printing, although fairly similar due to the same base of the alloys, have different features due to different combinations of alloying elements. The mechanical properties of the samples with the introduction of up to 15 % of the Udimet500 alloy are higher than those of the samples of the second material. With the introduction of 25 % of a nickel alloy, the strength is higher for the composite material samples with the introduction of the Inconel625 alloy. The microhardness of the samples with the introduction of 5 % of a nickel alloy is identical, the introduction of large volumes of a nickel alloy leads to the implementation of greater hardness in the samples with the introduction of the Inconel625 alloy due to the higher content of refractory materials. Relative elongation after rupture varies insignificantly for the samples of both types.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90405100","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

A surface eddy current transducer for metal loss detection 一种用于金属损耗检测的表面涡流传感器

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-12-01 DOI: 10.17804/2410-9908.2022.6.016-024

Y. Reutov

引用次数: 0

Studying multiphase flow around a vehicle moving freely to the water surface 研究在水面上自由运动的飞行器周围的多相流

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2022-12-01 DOI: 10.17804/2410-9908.2022.6.046-064

V. Pegov, I. Moshkin

{"title":"Studying multiphase flow around a vehicle moving freely to the water surface","authors":"V. Pegov, I. Moshkin","doi":"10.17804/2410-9908.2022.6.046-064","DOIUrl":"https://doi.org/10.17804/2410-9908.2022.6.046-064","url":null,"abstract":"The paper provides an experimental study of a multiphase flow around models in a large high-speed hydrodynamic tunnel with a vertical working section. Experimental dependences of drag coefficients on the cavitation number for vertical cavities are obtained. The results of cavitation flow around bodies of revolution in a vertically descending fluid flow are considered. A methodology for calculating the shape of vertical cavities under the slender-body theory is proposed. Relationships suitable for engineering evaluation are obtained for very long cavities. Numerical simulation of underwater motion is performed with models moving vertically in a nonstationary cavitation flow. The hydrodynamic loads can be evaluated through the determination of the nonstationary boundaries of a gas cavity and a linear load on a water-flown aft. The predicted results are compared with the experimental data. Validation and verification are performed by comparing the analysis results with the experimental data. The applicability of the proposed method to the determination of the hydrodynamic parameters of vehicles under multiphase flow is demonstrated.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74647648","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