发布求助
文献互助 智能选刊 最新文献

Journal of Applied Mechanics and Technical Physics最新文献

筛选
英文 中文
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 0.6 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":"https://doi.org/10.1134/s0021894424020184","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":"322 1","pages":""},"PeriodicalIF":0.6,"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
CALCULATION OF THE LINEAR STABILITY OF LIQUID FLOW IN A FLAT CHANNEL WITH STREAMWISE WAVY WALLS 计算带波浪形流壁的平槽中液体流动的线性稳定性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060093
Yu. Ya. Trifonov
{"title":"CALCULATION OF THE LINEAR STABILITY OF LIQUID FLOW IN A FLAT CHANNEL WITH STREAMWISE WAVY WALLS","authors":"Yu. Ya. Trifonov","doi":"10.1134/S0021894423060093","DOIUrl":"10.1134/S0021894423060093","url":null,"abstract":"<p>The full Navier–Stokes equations are used to study the linear stability of plane Poiseuille flow in a channel with the lower wall corrugated along the flow, due to which the flow has two velocity components. A generalized eigenvalue problem is solved numerically. Three types of perturbations are considered: plane periodic (zero Floquet parameter), plane doubly periodic (finite values of the Floquet parameter), and spatial perturbations. Neutral curves are analyzed in a wide range of the corrugation parameter and Reynolds number. It is found that the critical Reynolds number above which time-growing perturbations appear depends in a complex way on the dimensionless amplitude and period of corrugation. It is shown that in the case of flow in a channel with corrugated wall, three-dimensional perturbations are usually more dangerous. The exception is the small amplitude of corrugation at which plane perturbations are more dangerous.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1000 - 1010"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751635","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
EFFECT OF INTERNAL PYLONS ON THE PARAMETERS OF THE JET FLOW IN A NOZZLE WITH A CENTRAL BODY 内塔对带中心体喷嘴中射流参数的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060160
N. P. Kiselev, I. N. Kavun, V. I. Zapryagaev, R. A. Styazhkin
{"title":"EFFECT OF INTERNAL PYLONS ON THE PARAMETERS OF THE JET FLOW IN A NOZZLE WITH A CENTRAL BODY","authors":"N. P. Kiselev,&nbsp;I. N. Kavun,&nbsp;V. I. Zapryagaev,&nbsp;R. A. Styazhkin","doi":"10.1134/S0021894423060160","DOIUrl":"10.1134/S0021894423060160","url":null,"abstract":"<p>A high-velocity flow in an axisymmetric nozzle containing a central body and pylons is studied. The influence of the geometry of the main and additional pylons on the gas-dynamic and thrust characteristics at the nozzle exit in the flow regime with <span>(n_{pr}= 2.25)</span> (<span>(n_{pr})</span> is the ratio of the pressure in the settling chamber to the ambient pressure) is determined. Azimuthal nonuniformity of the flow at the nozzle exit is detected. The maximum azimuthal nonuniformity is observed in the wake behind the pylons. It is shown that a three-dimensional transonic flow is formed in the nozzle duct with the pylons mounted in the minimum free cross section; local supersonic regions closed by weak shock waves are formed in this flow. It is found that the formation of such a shock wave structure is responsible for nozzle thrust reduction by 12%.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1058 - 1067"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752086","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 A LEADER SAMPLE TO PREDICT THE CREEP AND LONG-TERM STRENGTH OF A MATERIAL DURING DUCTILE FRACTURE 利用引线样品预测材料在韧性断裂过程中的蠕变和长期强度
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060238
V. P. Radchenko, E. A. Afanaseva, M. N. Saushkin
{"title":"USING A LEADER SAMPLE TO PREDICT THE CREEP AND LONG-TERM STRENGTH OF A MATERIAL DURING DUCTILE FRACTURE","authors":"V. P. Radchenko,&nbsp;E. A. Afanaseva,&nbsp;M. N. Saushkin","doi":"10.1134/S0021894423060238","DOIUrl":"10.1134/S0021894423060238","url":null,"abstract":"<p>A method is developed for predicting creep and long-term strength based on the behavior of a previously tested sample (leader sample, prototype) in the case of ductile fracture. It is assumed that a loaded material does not undergo instantaneous plastic deformation and the first stage of creep. The incompressibility hypothesis is fulfilled in this case. It is shown that, if a constant-stress creep curve and the time to fracture are known for a leader sample, then obtaining a diagram of rheological deformation and long-term strength of the material at other stress values requires knowing only the initial (at the initial time) minimum creep strain rate of the samples for these stress values. The relevance of the developed method is checked with experimental data in two types of tests. The first type is tension tests of 12Kh18N10T corrosion-resistant steel samples at a temperature of 850°C and titanium alloy samples at a temperature of 600°C and the second type is tension and torsion tests of D16T alloy samples at a temperature of 250°C. It is shown that the prediction results are independent of the choice of a leader sample from many samples tested at different stresses. The possibility of using the developed method in experimental studies of creep of materials until their fracture is discussed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1119 - 1127"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888991","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信