Theoretical and Applied Mechanics最新文献_第10页

Ut vis sic tensio 但这是一种紧张

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Theoretical and Applied Mechanics Pub Date : 2017-01-01 DOI: 10.2298/TAM170703011S

Giuseppe Saccomandi

引用次数: 4

Stability of LevitronTM revisited 重新审视LevitronTM的稳定性

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Theoretical and Applied Mechanics Pub Date : 2017-01-01 DOI: 10.2298/tam171107017s

S. Simić

引用次数: 0

A pileup of screw dislocations against an inclined bimetallic interface 螺旋位错在倾斜的双金属界面上的堆积

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Theoretical and Applied Mechanics Pub Date : 2017-01-01 DOI: 10.2298/TAM170504007L

A. V. Lubarda

{"title":"A pileup of screw dislocations against an inclined bimetallic interface","authors":"A. V. Lubarda","doi":"10.2298/TAM170504007L","DOIUrl":"https://doi.org/10.2298/TAM170504007L","url":null,"abstract":"A pileup of edge dislocations against an arbitrarily inclined flat bimetallic interface is considered. Equilibrium positions of dislocations are determined for a given number of dislocations and specified material properties, assuming that the resolved shear stress along the pileup plane from a remotely applied loading is uniform and equal for all interface inclination angles. Numerical results are compared for pileups at 0°, 30°, 45°, and 60° relative to the interface normal. The overall dislocation distribution is mildly affected by the inclination of the interface, although there are some notable differences. While an inclined interface repels the first and last dislocation stronger than the orthogonal interface, for piled-up dislocations in-between this is not necessarily the case. Small differences in the pileup length and the proximity of the leading dislocation to differently inclined interfaces can considerably affect the interface stresses. The magnitude of interface stresses decreases with the increase of the shear moduli ratio G2/G1 due to stronger repulsion exerted on dislocations by stiffer interfaces. The disparity in Poisson’s ratio also affects the interface stresses. The back stress behind a trailing dislocation is evaluated and discussed.","PeriodicalId":44059,"journal":{"name":"Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80700218","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: 6

On geometrization of motion of some nonholonomic systems 一些非完整系统运动的几何化

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Theoretical and Applied Mechanics Pub Date : 2017-01-01 DOI: 10.2298/TAM171110013B

A. Bakša

引用次数: 4

On integrals, Hamiltonian and metriplectic formulations of polynomial systems in 3D 三维多项式系统的积分、哈密顿公式和三重公式

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Theoretical and Applied Mechanics Pub Date : 2016-08-04 DOI: 10.2298/TAM161118001E

Ougul Esen, A. Choudhury, P. Guha

引用次数: 1

Physiological non-Newtonian blood flow through single stenosed artery 通过单个狭窄动脉的生理非牛顿血流

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Theoretical and Applied Mechanics Pub Date : 2016-07-12 DOI: 10.1063/1.4958361

Khairuzzaman Mamun, M. M. Rahman, M. Akhter, M. Ali

{"title":"Physiological non-Newtonian blood flow through single stenosed artery","authors":"Khairuzzaman Mamun, M. M. Rahman, M. Akhter, M. Ali","doi":"10.1063/1.4958361","DOIUrl":"https://doi.org/10.1063/1.4958361","url":null,"abstract":"A numerical simulation to investigate the Non-Newtonian modeling effects on\u0000 physiological flows in a three dimensional idealized artery with a single\u0000 stenosis of 85% severity is given. The wall vessel is considered to be\u0000 rigid. Oscillatory physiological and parabolic velocity profile has been\u0000 imposed for inlet boundary condition. Determination of the physiological\u0000 waveform is performed using a Fourier series with sixteen harmonics. The\u0000 investigation has a Reynolds number range of 96 to 800. Low Reynolds number\u0000 k ? w model is used as governing equation. The investigation has been\u0000 carried out to characterize two Non-Newtonian constitutive equations of\u0000 blood, namely, (i) Carreau and (ii) Cross models. The Newtonian model has\u0000 also been investigated to study the physics of fluid. The results of\u0000 Newtonian model are compared with the Non-Newtonian models. The numerical\u0000 results are presented in terms of velocity, pressure, wall shear stress\u0000 distributions and cross sectional velocities as well as the streamlines\u0000 contour. At early systole pressure differences between Newtonian and\u0000 Non-Newtonian models are observed at pre-stenotic, throat and immediately\u0000 after throat regions. In the case of wall shear stress, some differences\u0000 between Newtonian and Non-Newtonian models are observed when the flows are\u0000 minimum such as at early systole or diastole. In general, the velocities at\u0000 throat regions are highest at all-time phase. However, at pick systole\u0000 higher velocities are observed at post-stenotic region. Downstream flow of\u0000 all models creates some recirculation regions at diastole.","PeriodicalId":44059,"journal":{"name":"Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89932450","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: 14

Analysis of the brachistochronic motion of a variable mass nonholonomic mechanical system 变质量非完整机械系统的臂慢运动分析

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Theoretical and Applied Mechanics Pub Date : 2016-01-01 DOI: 10.2298/TAM150723002J

B. Jeremić, R. Radulović, A. Obradović

{"title":"Analysis of the brachistochronic motion of a variable mass nonholonomic mechanical system","authors":"B. Jeremić, R. Radulović, A. Obradović","doi":"10.2298/TAM150723002J","DOIUrl":"https://doi.org/10.2298/TAM150723002J","url":null,"abstract":"The paper considers the brachistochronic motion of a variable mass nonholonomic mechanical system [3] in a horizontal plane, between two specified positions. Variable mass particles are interconnected by a lightweight mechanism of the ‘pitchfork’ type. The law of the time-rate of mass variation of the particles, as well as relative velocities of the expelled particles, as a function of time, are known. Differential equations of motion, where the reactions of nonholonomic constraints and control forces figure, are created based on the general theorems of dynamics of a variable mass mechanical system [5]. The formulated brachistochrone problem, with adequately chosen quantities of state, is solved, in this case, as the simplest task of optimal control by applying Pontryagin’s maximum principle [1]. A corresponding two-point boundary value problem (TPBVP) of the system of ordinary nonlinear differential equations is obtained, which, in a general case, has to be numerically solved [2]. On the basis of thus obtained brachistochronic motion, the active control forces, along with the reactions of nonholonomic constraints, are determined. The analysis of the brachistochronic motion for different values of the initial position of a variable mass particle B is presented. Also, the interval of values of the initial position of a variable mass particle B, for which there are the TPBVP solutions, is determined.","PeriodicalId":44059,"journal":{"name":"Theoretical and Applied Mechanics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89494444","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: 2

DIFFUSSION-THERMO AND CHEMICAL REACTION EFFECTS ON AN UNSTEADY MHD FREE CONVECTION FLOW IN A MICROPOLAR FLUID 微极流体中非定常MHD自由对流的扩散-热和化学反应效应

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Theoretical and Applied Mechanics Pub Date : 2016-01-01 DOI: 10.2298/TAM160223007S

SivaReddy Sheri, M. Shamshuddin

引用次数: 13

Chemically reacting fluid flow induced by an exponentially accelerated infinite vertical plate in a magnetic field and variable temperature via LTT and FEM 通过LTT和FEM研究了指数加速无限垂直板在变温度磁场下的化学反应流体流动

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Theoretical and Applied Mechanics Pub Date : 2016-01-01 DOI: 10.2298/TAM151214003S

R. R. Srinivasa, G. Aruna, N. Naidu, S. Varma, Mohammad Mehdi Rashidi

引用次数: 15

On the entire and finite valued solutions of the three-body problem 三体问题的全解和有限值解

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Theoretical and Applied Mechanics Pub Date : 2016-01-01 DOI: 10.2298/TAM160126010B

A. Belyaev

引用次数: 0