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SMEARED CONCEPT AS A GENERAL METHODOLOGY IN FINITE ELEMENT MODELING OF PHYSICAL FIELDS AND MECHANICAL PROBLEMS IN COMPOSITE MEDIA 复合材料物理场和力学问题有限元建模的一种通用方法&模糊概念
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-12-31 DOI: 10.24874/JSSCM.2018.12.02.01
M. Kojic
{"title":"SMEARED CONCEPT AS A GENERAL METHODOLOGY IN FINITE ELEMENT MODELING OF PHYSICAL FIELDS AND MECHANICAL PROBLEMS IN COMPOSITE MEDIA","authors":"M. Kojic","doi":"10.24874/JSSCM.2018.12.02.01","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.02.01","url":null,"abstract":"A generalization of the smeared concept for field problems, published in recent papers of the author and his collaborators, is presented in the paper. A composite smeared finite element CSFE is formulated. This generalization can serve as a theoretical background for further applications. A selected numerical example, related to convective-diffusive mass transport within a cancerous tissue, illustrates efficiency and accuracy of the smeared models. Further, a smeared methodology is extended to mechanical problems. A theoretical background is given in detail, with introducing a composite smeared finite element for mechanics CSFEM, which can further be tested and modified. Finally, a consistent derivation is presented for the continuum constitutive tensor corresponding to a fibrous structure.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47742915","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: 11
INFORMATION MEASURING SYSTEM OF NUMERICAL DIFFERENTIATION FOR THE ANALYSIS OF ELEMENTS OF MECHANICAL STRUCTURES 用于机械结构单元分析的数值微分信息测量系统
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-12-31 DOI: 10.24874/JSSCM.2018.12.02.04
A. P. Loktionov
{"title":"INFORMATION MEASURING SYSTEM OF NUMERICAL DIFFERENTIATION FOR THE ANALYSIS OF ELEMENTS OF MECHANICAL STRUCTURES","authors":"A. P. Loktionov","doi":"10.24874/JSSCM.2018.12.02.04","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.02.04","url":null,"abstract":"In this paper, the theory of the Lagrange polynomial approximation of a directly non-measurable characteristic of an element of a mechanical structure by means of an information-measuring system of numerical differentiation is refined. It is shown how to obtain the maximal accuracy of approximation on the basis of the theory of inverse problems and the method of reduction of measurements. For a cantilever beam loaded with concentrated force at its free end, a method has been developed for the experimental and calculated determination of the bending moment at the fixed end of the beam. The basis of the method is the procedure for the optimal placement of sensors and transformation of sensor output signals, if the length of the beam and the initial parameters of the elastic line (lateral displacement and the angle of rotation on the support) are not accurate.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45311193","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
MATHEMATICAL MODELLING OF POLYMER TRAJECTORY DURING ELECTROSPINNING 静电纺丝过程中聚合物轨迹的数学建模
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-12-31 DOI: 10.24874/jsscm.2018.12.02.02
Ilektra Ferouka, T. Šušteršič, M. Zivanovic, N. Filipovic
{"title":"MATHEMATICAL MODELLING OF POLYMER TRAJECTORY DURING ELECTROSPINNING","authors":"Ilektra Ferouka, T. Šušteršič, M. Zivanovic, N. Filipovic","doi":"10.24874/jsscm.2018.12.02.02","DOIUrl":"https://doi.org/10.24874/jsscm.2018.12.02.02","url":null,"abstract":"The most important characteristics of the electrospun fibers are their internal morphology and their diameter. They both depend on polymer’s parameters, but also on the process parameters. The motivation for this research is therefore to simulate the jet during electrospinning and analyze the effects of some of the parameters on the jet (and implicitly on fibers), without the necessity to perform the experiments each time. The calculations of the polymer’s behavior between the electrodes was based on the discrete model of Reneker. Thus, the jet was modeled as a system of beads connected by viscoelastic elements. The results were compared to the results obtained in the literature and showed good agreement. The results showed how the jet shape during electrospinning depends on each parameter. The ultimate goal was to establish the exact influence of the above-mentioned parameters on the fibers’ diameter. This would allow to set rough values of electrospinning parameters, which could be further fine-tuned, in order to obtain the fibers with expected characteristics. The beneficial effect of such simulations are time gain, but also reduced material consumption, maintenance costs etc.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46243070","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: 4
CARGO TRANSPORTATION BY BRIDGE CRANES ALONG A PREDETERMINED TRAJECTORY WITHOUT UNCONTROLLABLE SWAYS 用桥式起重机沿预定轨道运输货物，无不可控的摆动
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-12-31 DOI: 10.24874/JSSCM.2018.12.02.05
M. Korytov, V. Shcherbakov
{"title":"CARGO TRANSPORTATION BY BRIDGE CRANES ALONG A PREDETERMINED TRAJECTORY WITHOUT UNCONTROLLABLE SWAYS","authors":"M. Korytov, V. Shcherbakov","doi":"10.24874/JSSCM.2018.12.02.05","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.02.05","url":null,"abstract":"In this paper, we propose a method and a mathematical model for solving the problem of cargo transportation on a suspension rope by a bridge crane following a predetermined trajectory in the absence of uncontrollable pendulum sways. To this end, the principle of reduction of the secondorder linearized differential equation, which describes sways in the ‘point of suspension – cargo’ system, is applied. As a result, a first-order differential equation is derived, in which the control action consists in the required acceleration of the cargo. The proposed method allows a rapid synthesis of an optimal trajectory of the suspension point for ensuring the required cargo movement trajectory in the horizontal direction without either complex mathematical calculations of the optimal control theory or the laborious algorithms of multidimensional or iterative optimization. This method can be used in the systems providing the automated control of bridge cranes with the function of restricting uncontrolled cargo sways, as well as in those having a new prospective function of cargo transportation maintenance along a predetermined trajectory.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41552166","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
STATISTICAL ESTIMATION OF RESIDUAL STRENGTH AND RELIABILITY OF CORRODED PIPELINE ELBOW PART BASED ON A DIRECT FE-SIMULATIONS 基于直接有限元模拟的管道弯头腐蚀残余强度及可靠性统计估计
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-10-31 DOI: 10.24874/JSSCM.2018.12.01.06
O. Larin, K. Potopalska, R. Mygushchenko
{"title":"STATISTICAL ESTIMATION OF RESIDUAL STRENGTH AND RELIABILITY OF CORRODED PIPELINE ELBOW PART BASED ON A DIRECT FE-SIMULATIONS","authors":"O. Larin, K. Potopalska, R. Mygushchenko","doi":"10.24874/JSSCM.2018.12.01.06","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.01.06","url":null,"abstract":"In this paper, the assessment of the effect of a corrosion defect, which is developing over time on the working capacity of the pipeline elbow, has been carried out. Corrosion damage models explicitly as volumetric defect on the out surface of the pipeline elbow. The zones on the damaged section of the pipeline on which the maximum stresses are localized has been defined using the finite element analysis. The estimation of the characteristics of the deformed state of a design with defect is analysed with the framework of computer simulations. On the basis of the obtained results, the probabilistic characteristics of the stresses and plastic strains have been approximated as a function of internal pressure and corrosion defect depth, such as mean value, coefficients of variation and asymmetry. Probability densities function of plasticity appearance have been found for different defect size in operation at typical loading levels.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48377611","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
DYNAMIC STABILITY OF DOUBLE-WALLED CARBON NANOTUBES 双壁碳纳米管的动力学稳定性
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-10-31 DOI: 10.24874/JSSCM.2018.12.01.01
D. Lolov, S. Lilkova-Markova
{"title":"DYNAMIC STABILITY OF DOUBLE-WALLED CARBON NANOTUBES","authors":"D. Lolov, S. Lilkova-Markova","doi":"10.24874/JSSCM.2018.12.01.01","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.01.01","url":null,"abstract":"This paper investigates the stability of a simply supported DWCNT conveying fluid inside its innermost tube. The van der Waals interaction between the adjacent carbon layers are taken into account. The Euler elastic beam model is employed in order to study the dynamic stability behavior of the system. The aim is to analyze the influence of the density of the conveyed fluid, the length of the tube and the dimensions of its cross section on the critical flow velocity of the fluid in the pipe under consideration and to draw conclusions about the stability of the system. This problem is approached numerically using the spectral Galerkin method. Results reveal that all above mentioned parameters have a significant effect on the stability of the nanotube.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43440628","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: 1
NUMERICAL STUDY OF MOTION OF A SPHERICAL PARTICLE IN A ROTATING PARABOLA USING LAGRANGIAN 用拉格朗日量数值研究球形粒子在旋转抛物线中的运动
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-10-31 DOI: 10.24874/jsscm.2018.12.01.04
H. Khalilia, R. Jarrar, J. Asad
{"title":"NUMERICAL STUDY OF MOTION OF A SPHERICAL PARTICLE IN A ROTATING PARABOLA USING LAGRANGIAN","authors":"H. Khalilia, R. Jarrar, J. Asad","doi":"10.24874/jsscm.2018.12.01.04","DOIUrl":"https://doi.org/10.24874/jsscm.2018.12.01.04","url":null,"abstract":"In this paper, we study the motion of a spherical particle in a rotating parabola using the Lagrangian method. As the first step, we construct the Lagrangian of the system, and then we obtain the Euler-Lagrange equations (i.e. equation of motion of the system). The obtained equation of motion is a homogenous second order equation. Finally, we solve this equation numerically using the ode45 code which is based on Runge-Kutta method.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49353709","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
MODELLING OF THE FEMORAL FRACTURE UNDER DYNAMIC LOADING 动态载荷作用下股骨骨折的建模
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-10-31 DOI: 10.24874/JSSCM.2018.12.01.07
A. Moulgada, Mohammed Zagane, A. Benouis, A. Sahli, M. Cherfi, S. Benbarek
{"title":"MODELLING OF THE FEMORAL FRACTURE UNDER DYNAMIC LOADING","authors":"A. Moulgada, Mohammed Zagane, A. Benouis, A. Sahli, M. Cherfi, S. Benbarek","doi":"10.24874/JSSCM.2018.12.01.07","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.01.07","url":null,"abstract":"Bone is a living material with a complex hierarchical structure that gives it remarkable mechanical properties. The bone undergoes constant mechanical and physiological stress, so its quality and its resistance to fracture evolve constantly over time through the process of bone remodelling. Bone quality is not only defined by bone mineral density but also by mechanical properties as well as micro architecture. The aim of this work is to model the fracture of the femur bone under a quasi-static and dynamic solicitation in order to create a digital model simulating the fractures of this element due to an accident. This modelling will contribute to improve the design of the means of transport to bring a better security to the passages. To achieve this goal, the modelling by the finite element method is performed to study the mechanical behaviour of bone structure and predict femur fractures.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49580794","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: 1
DUFOUR AND SORET EFFECTS ON UNSTEADY MHD FREE CONVECTIVE FLOW OF VISCOUS INCOMPRESSIBLE FLUID PAST AN INFINITE VERTICAL POROUS PLATE IN THE PRESENCE OF RADIATION 辐射作用下粘性不可压缩流体通过无限垂直多孔板的非定常MHD自由对流的Dufour和soret效应
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-10-31 DOI: 10.24874/jsscm.2018.12.01.02
B. P. Reddy, J. Sunzu
{"title":"DUFOUR AND SORET EFFECTS ON UNSTEADY MHD FREE CONVECTIVE FLOW OF VISCOUS INCOMPRESSIBLE FLUID PAST AN INFINITE VERTICAL POROUS PLATE IN THE PRESENCE OF RADIATION","authors":"B. P. Reddy, J. Sunzu","doi":"10.24874/jsscm.2018.12.01.02","DOIUrl":"https://doi.org/10.24874/jsscm.2018.12.01.02","url":null,"abstract":"In this paper, the Dufour and Soret effects on an unsteady MHD free convection flow of an incompressible, electrically conducting viscous Newtonian fluid past an infinite vertical porous plate have been studied, taking into account Viscous and Darcy resistance terms and constant permeability of the medium in the presence of radiation. The fluid is considered as a gray, absorbing-emitting but non-scattering medium. The Rosseland approximation in the energy equation is used to describe the radiative heat flux for optically thick fluid. The dimensionless governing equations for this investigation are solved numerically using Galerkin finite element method. The influence of the physical parameters involved in the problem under investigation on the velocity, temperature and concentration profiles within the boundary layer are presented through the graphs and tabulated results for the skin-friction coefficient, Nusselt and Sherwood numbers.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44580404","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
ACTIVE CONTROL OF BLOOD FLOW IN THE AORTA USING EXTERNAL MAGNETIC FIELD 利用外部磁场主动控制主动脉血流
IF 0.4
Journal of the Serbian Society for Computational Mechanics Pub Date : 2018-10-31 DOI: 10.24874/JSSCM.2018.12.01.03
N. Aggoune, G. Mebarki, M. Nezar, M. Aggoune, R. Abdessemed
{"title":"ACTIVE CONTROL OF BLOOD FLOW IN THE AORTA USING EXTERNAL MAGNETIC FIELD","authors":"N. Aggoune, G. Mebarki, M. Nezar, M. Aggoune, R. Abdessemed","doi":"10.24874/JSSCM.2018.12.01.03","DOIUrl":"https://doi.org/10.24874/JSSCM.2018.12.01.03","url":null,"abstract":"The objective of the present study is the active flow control of blood in the aorta with atherosclerosis using an External Magnetic Field (EMF) in order to facilitate the blood flow. For that purpose, a numerical investigation has been developed with a Magneto-hydrodynamics flow modelisation. The blood is considered homogeneous, incompressible and Newtonian and the fluid flow is assumed to be unsteady, two-dimensional and laminar. The aorta tissue is electrically conductive. Fluent software has been used to solve the governing equations. The results relating to velocity, pressure and the wall shear stress indicate that the presence of the EMF considerably influences the blood flow. The flow control deals with the effects of the EMF direction of application and its intensity. The results show that by applying an EMF, the blood velocity and pressure in the aorta are entirely affected. The direction and the intensity of the EMF allow minimization of the flow instabilities due to the geometrical singularities. Therefore, applying an EMF can be considered an appropriate method for flow control in order to obtain a uniform blood circulation around the atherosclerosis.","PeriodicalId":42945,"journal":{"name":"Journal of the Serbian Society for Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46495324","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: 1
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