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CALCULATION OF STRESS-STRAIN STATE OF FIBER COMPOSITE ADHESIVE 纤维复合粘合剂的应力-应变状态计算
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-06-25 DOI: 10.1134/S0021894424020111
S. I. Rakin, Siberian State Transport University
{"title":"CALCULATION OF STRESS-STRAIN STATE OF FIBER COMPOSITE ADHESIVE","authors":"S. I. Rakin,&nbsp;Siberian State Transport University","doi":"10.1134/S0021894424020111","DOIUrl":"10.1134/S0021894424020111","url":null,"abstract":"<p>The main types of strain of an adhesive cross-reinforced with composite fibers is analyzed using a solution to the cell problem of the elasticity theory. It is shown that all previously predicted possible types of local strain of a fiber composite adhesive are revealed in numerical solutions to the cell problem of the homogenization theory. The local stress-strain state of the adhesive significantly depends on the cross-sectional shape of the fibers. The stress-strain state in the case of square fibers can be calculated either using explicit formulas, and the stress-strain state in the case of fibers of other shapes can be estimated only using a computer.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 2","pages":"290 - 299"},"PeriodicalIF":0.5,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
LONG-WAVE FLEXURAL VIBRATIONS AND DEFORMATION OF A SMALL-SIZE BEAM CONSIDERING SURFACE EFFECTS 考虑表面效应的小型横梁的长波挠性振动和变形
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-06-25 DOI: 10.1134/S0021894424020184
G. I. Mikhasev
{"title":"LONG-WAVE FLEXURAL VIBRATIONS AND DEFORMATION OF A SMALL-SIZE BEAM CONSIDERING SURFACE EFFECTS","authors":"G. I. Mikhasev","doi":"10.1134/S0021894424020184","DOIUrl":"10.1134/S0021894424020184","url":null,"abstract":"<p>A small-size elastic isotropic beam-strip loaded by variable body and surface forces is considered. On the front surfaces, surface shear stresses and inertia are taken into account within the framework of the Gurtin–Murdoch surface elasticity theory. Asymptotically correct equations describing the long-wavelength bending deformation of micro- and nano-beams taking into account shears and surface effects are derived by asymptotic integration of the two-dimensional elasticity equations over the strip thickness. The influence of surface stresses and inertia on the lower spectrum of natural vibrations of metal micro- and nano-beams is studied. It is shown that surface inertia has the same effect on the frequency spectrum of natural flexural vibrations as surface stresses.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 2","pages":"368 - 377"},"PeriodicalIF":0.5,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effective Thermal Characteristics of Nanostructures in the Presence of Kapitza Resistance 存在卡皮察电阻时纳米结构的有效热特性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-06-25 DOI: 10.1134/S0021894424020159
A. S. Starkov, I. A. Starkov
{"title":"Effective Thermal Characteristics of Nanostructures in the Presence of Kapitza Resistance","authors":"A. S. Starkov,&nbsp;I. A. Starkov","doi":"10.1134/S0021894424020159","DOIUrl":"10.1134/S0021894424020159","url":null,"abstract":"<div><p>The effective thermal characteristics of composite materials used in the theory of solidstate cooling are studied. Two classes of composites are considered: layered structures consisting of a large number of nano-sized layers and two-phase granular composites. It is assumed that the interfaces between media are imperfect. The Kapitza temperature jump occurs at the interfaces. The effective characteristics of layered structures are obtained using the matrix homogenization method. The homogenization of the characteristics of granular composites is based on the Bruggeman approach. Formulas taking into account the influence of the interlayer Kapitza resistance on the homogenized thermal characteristics of the structure are obtained. Expressions for average values of heat sources are derived.</p></div>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"65 2","pages":"336 - 344"},"PeriodicalIF":0.5,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141510565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DETERMINATION OF CAMOUFLET EXPLOSION PARAMETERS 确定迷彩爆炸参数
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060056
V. A. Sednev, S. L. Kopnyshev, A. V. Sednev
{"title":"DETERMINATION OF CAMOUFLET EXPLOSION PARAMETERS","authors":"V. A. Sednev,&nbsp;S. L. Kopnyshev,&nbsp;A. V. Sednev","doi":"10.1134/S0021894423060056","DOIUrl":"10.1134/S0021894423060056","url":null,"abstract":"<p>The centrally symmetric problem of determining the velocity field in a continuous elastoplastic medium during a camouflet explosion has been solved assuming that the motion is non-oscillatory nature and that the medium in the plastic and elastic regions is incompressible. The solution was found using the camouflet equation — the relation for determining the pressure on the contact surface of the expanding explosion cavity. The solution can be used to estimate the dimensions of the expansion and plastic deformation regions and the impact of explosive disturbances on objects.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"972 - 978"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DETERMINATION OF GRAPHYNE ELASTICITY CONSTANTS BY THE MOLECULAR DYNAMICS METHOD 用分子动力学方法测定石墨烯弹性常数
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060202
P. V. Polyakova, R. T. Murzaev, J. A. Baimova
{"title":"DETERMINATION OF GRAPHYNE ELASTICITY CONSTANTS BY THE MOLECULAR DYNAMICS METHOD","authors":"P. V. Polyakova,&nbsp;R. T. Murzaev,&nbsp;J. A. Baimova","doi":"10.1134/S0021894423060202","DOIUrl":"10.1134/S0021894423060202","url":null,"abstract":"<p>The molecular dynamics method is applied to calculate the stiffness constants of five structural configurations of graphyne. The latter is a carbon monolayer in which the atoms are arranged in a special way and characterized by <span>(sp)</span>- and <span>(sp^2)</span>-hybritization. It is revealed that the atom arrangement in a graphyne layer has a significant effect on the stiffness constants. It is determined that <span>(gamma_2)</span>-graphyne has the highest stiffness constant <span>(c_{11})</span> (1091 GPa) and that <span>(alpha)</span>-graphyne has the smallest one (258 GPa). As shown in the study, <span>(beta_3)</span>- and <span>(gamma_2)</span>-graphyne are highly anisotropic structures.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1097 - 1099"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PHYSICOMATHEMATICAL MODELING OF HUMAN BREATHING IN SITUATIONS OF VARIOUS PULMONARY DISEASES 各种肺部疾病情况下人体呼吸的物理数学模型
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060147
P. S. Golysheva, A. E. Medvedev
{"title":"PHYSICOMATHEMATICAL MODELING OF HUMAN BREATHING IN SITUATIONS OF VARIOUS PULMONARY DISEASES","authors":"P. S. Golysheva,&nbsp;A. E. Medvedev","doi":"10.1134/S0021894423060147","DOIUrl":"10.1134/S0021894423060147","url":null,"abstract":"<p>Three-dimensional numerical simulations of the air flow in the full human bronchial tree in situations of obstructive and chronic pulmonary diseases are performed. Based on the previously developed three-dimensional analytical model of the lower respiratory airways, the air distributions in the lungs (from the trachea to alveoli) in situations with lung injuries and bronchial asthma are calculated. Breathing modeling is based on a numerical technique of step-by-step computations, which allows one to avoid the loss of solution accuracy caused by the difference in the bronchus scales; moreover, the time needed to calculate the air flow in the lungs can be reduced by several times by using this technique.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1041 - 1045"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NUMERICAL SIMULATION OF A NANOPARTICLE IMPACT ONTO A TARGET BY THE MOLECULAR DYNAMICS METHOD UNDER THE CONDITIONS OF COLD GAS-DYNAMIC SPRAYING 在冷气体动力喷射条件下利用分子动力学方法对纳米粒子撞击目标的数值模拟
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060044
O. V. Belai, S. P. Kiselev, V. P. Kiselev
{"title":"NUMERICAL SIMULATION OF A NANOPARTICLE IMPACT ONTO A TARGET BY THE MOLECULAR DYNAMICS METHOD UNDER THE CONDITIONS OF COLD GAS-DYNAMIC SPRAYING","authors":"O. V. Belai,&nbsp;S. P. Kiselev,&nbsp;V. P. Kiselev","doi":"10.1134/S0021894423060044","DOIUrl":"10.1134/S0021894423060044","url":null,"abstract":"<p>Results on a nanoparticle impact onto a target calculated by the molecular dynamics method are presented. The first problem being solved is the nanoparticle impact onto a target under the conditions of cold gas-dynamic spraying. The second problem deals with nanoparticle extension, which adheres to the target due to the impact. It is shown that a chemical bond between the nanoparticle and target is formed during the impact. The bond in the case of the titanium nanoparticle impact onto an aluminum target is found to be stronger than that in the case of the aluminum nanoparticle impact onto a titanium target. The reason is that the titanium nanoparticle penetrates into the aluminum target to a greater depth.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"964 - 971"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PHYSICAL MECHANISMS OF VAPOR BUBBLE COLLAPSE DURING LASER-INDUCED BOILING 激光诱导沸腾过程中气泡崩溃的物理机制
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060135
V. A. Kosyakov, R. V. Fursenko, S. S. Minaev, V. M. Chudnovskii
{"title":"PHYSICAL MECHANISMS OF VAPOR BUBBLE COLLAPSE DURING LASER-INDUCED BOILING","authors":"V. A. Kosyakov,&nbsp;R. V. Fursenko,&nbsp;S. S. Minaev,&nbsp;V. M. Chudnovskii","doi":"10.1134/S0021894423060135","DOIUrl":"10.1134/S0021894423060135","url":null,"abstract":"<p>Effects of various physical mechanisms at the stage of vapor bubble collapse and the subsequent formation of a shaped-charge jet in the process of laser-induced boiling near the end of a thin waveguide immersed in a cold liquid is studied numerically. Depending on the evaporation intensity, three process modes are identified and described.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1036 - 1040"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
USING TWO-PARAMETER VELOCITY PROFILES FOR THREE-DIMENSIONAL BOUNDARY LAYERS 使用双参数速度剖面测量三维边界层
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060172
A. V. Boiko, N. V. Demidenko
{"title":"USING TWO-PARAMETER VELOCITY PROFILES FOR THREE-DIMENSIONAL BOUNDARY LAYERS","authors":"A. V. Boiko,&nbsp;N. V. Demidenko","doi":"10.1134/S0021894423060172","DOIUrl":"10.1134/S0021894423060172","url":null,"abstract":"<p>Approximations of the profiles of the longitudinal and transverse velocity components in the boundary layer calculated for the flows around a swept wing and a body of revolution by means of solving the full Navier–Stokes equations and using the boundary layer profiles from the self-similar one-parameter family of the Falkner–Skan–Cooke profiles and two-parameter family of profiles proposed by Gaster are compared. A significant advantage of using the approximation of the numerical profiles near three-dimensional separation by profiles from the two-parameter family is demonstrated.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1068 - 1077"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
APPROXIMATE SOLUTION OF THE PROBLEM OF FLOW IN A FAR PLANE MOMENTUMLESS TURBULENT WAKE 远平面无动量湍流尾流中流动问题的近似解法
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S002189442306007X
A. V. Shmidt
{"title":"APPROXIMATE SOLUTION OF THE PROBLEM OF FLOW IN A FAR PLANE MOMENTUMLESS TURBULENT WAKE","authors":"A. V. Shmidt","doi":"10.1134/S002189442306007X","DOIUrl":"10.1134/S002189442306007X","url":null,"abstract":"<p>The flow in a far plane momentumless turbulent wake is described using a mathematical model obtained from the algebraic Rodi model of Reynolds stresses. The model is similar to the two-parameter (<span>(k{-}varepsilon)</span>) turbulence model in the far-wake approximation with a modified empirical constant in the diffusion terms of the equations. A group-theoretical analysis of the mathematical model of the wake is carried out, and a self-similar reduction of the model equations to a system of ordinary differential equations is performed. An approximate solution of the corresponding boundary-value problem is constructed using an asymptotic expansion of the solution in the vicinity of a singular point.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"987 - 992"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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