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Effect of Delamination on Natural Frequencies of E-glass and S-glass Epoxy Composite Plates 分层对E-玻璃和S-玻璃环氧树脂复合板固有频率的影响
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-22 DOI: 10.13052/EJCM1779-7179.29466
P. K. Karsh, B. Thakkar, R. R. Kumar, Abhijeet Kumar, S. Dey
{"title":"Effect of Delamination on Natural Frequencies of E-glass and S-glass Epoxy Composite Plates","authors":"P. K. Karsh, B. Thakkar, R. R. Kumar, Abhijeet Kumar, S. Dey","doi":"10.13052/EJCM1779-7179.29466","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29466","url":null,"abstract":"The delamination is one of the major modes of failure occurring in the laminated composite due to insufficient bonding between the layers. In this paper, the natural frequencies of delaminated S-glass and E-glass epoxy cantilever composite plates are presented by employing the finite element method (FEM) approach. The rotary inertia and transverse shear deformation are considered in the present study. The effect of parameters such as the location of delamination along the length, across the thickness, the percentage of delamination, and ply-orientation angle on first three natural frequencies of the cantilever plates are presented for S-glass and E-glass epoxy composites. The standard eigenvalue problem is solved to obtain the natural frequencies and corresponding mode shapes. First three mode shape of S-Glass and E-Glass epoxy laminated composites are portrayed corresponding to different ply angle of lamina.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49492532","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
Simulation of Crude Oil Transportation with Drag Reduction Agents Using k-ϵ and k-ω Models 基于k- ε和k-ω模型的原油减阻剂输运模拟
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-22 DOI: 10.13052/EJCM1779-7179.29467
A. Khalaf, Asaad A. Abdullah
{"title":"Simulation of Crude Oil Transportation with Drag Reduction Agents Using k-ϵ and k-ω Models","authors":"A. Khalaf, Asaad A. Abdullah","doi":"10.13052/EJCM1779-7179.29467","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29467","url":null,"abstract":"This work explores the possibility of using Newtonian turbulence k−ϵ and k−ω models for modelling crude oil flow in pipelines with drag reduction agents. These models have been applied to predict the friction factor, pressure drop and the drag reduction percentage. The simulation results of both models were compared with six published experimental data for crude oil flow in pipes with different types of drag reduction agents. The velocity near the wall was determined using the log law line of Newtonian fluid equation and by changing the parameter ΔB to achieve an excellent agreement with experimental data. Simulated data for k−ϵ model shows better agreement with most experimental data than the k−ω turbulence model.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46297987","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
Sensitivity Analysis of Quality of B-spline Parameterization on Isogeometric Analysis 等距分析中B样条参数化质量的灵敏度分析
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-13 DOI: 10.13052/EJCM1779-7179.29462
Sangamesh Gondegaon, Hari K. Voruganti
{"title":"Sensitivity Analysis of Quality of B-spline Parameterization on Isogeometric Analysis","authors":"Sangamesh Gondegaon, Hari K. Voruganti","doi":"10.13052/EJCM1779-7179.29462","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29462","url":null,"abstract":"Isogeometric analysis (IGA) is a mesh free technique which make use of B-spline basis functions for geometry and field variable representation. Parameterization of B-spline for IGA is the counterpart of meshing as in finite element method (FEM). The objective of parameterization is to find the optimum set of control points for B-spline modelling. The position of control points of a B-spline model has huge effect on IGA results. In this work, the effect of B-spline parameterization on IGA result is presented. One dimensional case of bar with self-weight is solved and compared with exact analytical solution. First fundamental matrix is used as evaluation metric to check the quality of parameterization for 2-D domains. A heat conduction problem of a square domain is presented to study the parameterization effect for 2-D case.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48301222","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
An Differential Quadrature Finite Element and the Differential Quadrature Hierarchical Finite Element Methods for the Dynamics Analysis of on Board Shaft 船载轴动力学分析的微分正交有限元及微分正交分层有限元方法
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-13 DOI: 10.13052/EJCM1779-7179.29461
Saim Ahmed, H. Abdelhamid, Bensaid Ismail, F. Ahmed
{"title":"An Differential Quadrature Finite Element and the Differential Quadrature Hierarchical Finite Element Methods for the Dynamics Analysis of on Board Shaft","authors":"Saim Ahmed, H. Abdelhamid, Bensaid Ismail, F. Ahmed","doi":"10.13052/EJCM1779-7179.29461","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29461","url":null,"abstract":"In this paper the dynamic analysis of a shaft rotor whose support is mobile is studied. For the calculation of kinetic energy and stiffness energy, the beam theory of Euler Bernoulli was used, and the matrices of elements and systems are developed using two methods derived from the differential quadrature method (DQM). The first method is the Differential Quadrature Finite Element Method (DQFEM) systematically, as a combination of the Differential Quadrature Method (DQM) and the Standard Finite Element Method (FEM), which has a reduced computational cost for problems in dynamics. The second method is the Differential Quadrature Hierarchical Finite Element Method (DQHFEM) which is used by expressing the matrices of the hierarchical finite element method in a similar form to that of the Differential Quadrature Finite Element Method and introducing an interpolation basis on the element boundary of the hierarchical finite element method. The discretization element used for both methods is a three-dimensional beam element. In the differential quadrature finite element method (DQFEM), the mass, gyroscopic and stiffness matrices are simply calculated using the weighting coefficient matrices given by the differential quadrature (DQ) and Gauss-Lobatto quadrature rules. The sampling points are determined by the Gauss-Lobatto node method. In the Differential Quadrature Hierarchical Finite Element Method (DQHFEM) the same approaches were used, and the cubic Hermite shape functions and the special Legendre polynomial Rodrigues shape polynomial were added. The assembly of the matrices for both methods (DQFEM and DQHFEM) is similar to that of the classical finite element method. The results of the calculation are validated with the h- and hp finite element methods and also with the literature.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45065538","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
Finite Element Simulation of Friction Stir Welding of Inconel 718 to Nimonic 80A Inconel 718与Nimonic 80A搅拌摩擦焊的有限元模拟
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-13 DOI: 10.13052/EJCM1779-7179.29465
T. Saju, M. Velu
{"title":"Finite Element Simulation of Friction Stir Welding of Inconel 718 to Nimonic 80A","authors":"T. Saju, M. Velu","doi":"10.13052/EJCM1779-7179.29465","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29465","url":null,"abstract":"This paper presents results of simulation of friction stir dissimilar welding of 5 mm thick, Nickel-based super-alloys, Inconel 718, and Nimonic 80A using Abaqus software. Four different trials were done to understand the influence of tool rotation speed on temperature distribution in weld zone while travel speed remains constant. The temperature in the weld zone was found to increase with the increase in tool rotation speed and travel speed. The temperature on the advancing side of the tool was higher than that of the retreating side. The tensile strength of weldment was found, by simulation, to be 25% more than that of base metal, Inconel 718. This may be due to grain refinement and dynamic recrystallization during FSW. The simulated bend test revealed an adequate level of ductility of weldments.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47275612","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
Analytical and Optimization Study of Propagation and Reduction of Wave in Granular Sand by DEM Method 基于DEM的砂粒中波浪传播与消减的分析与优化研究
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-13 DOI: 10.13052/EJCM1779-7179.29464
Amin Moslemi Petrudi, Masoud Rahmani
{"title":"Analytical and Optimization Study of Propagation and Reduction of Wave in Granular Sand by DEM Method","authors":"Amin Moslemi Petrudi, Masoud Rahmani","doi":"10.13052/EJCM1779-7179.29464","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29464","url":null,"abstract":"In this research, the discrete element method has been used to analyze wave propagation and to investigate the factors affecting wave reduction in granular soils. The method of discrete elements is important because of the possibility of preparing completely similar specimens and examining the effect of changes in a certain parameter on the Behavior of the specimens. This method also provides an understanding of the changes that have occurred at the micro-scale of granular materials that are not achievable with other laboratory and numerical methods. To model the specimens, a set of disks with specific granulation has been used for two-dimensional studies. PFC 2D software has been used to perform simulations and related analyzes such as interparticle force. The DEM code in MATLAB is used to check the wave depreciation. In this research, the optimization process was performed using experimental data and the Taguchi method using the DEM method. The results of this study show that there is a direct relationship between the number of particle set contacts and the wave propagation speed. Also, material properties such as particle density are the most important parameters affecting wave velocity. The results of the method (DEM) are done with PFC 2D software and a comparison between the results of this method with the solution methods used by other researchers is shown to be a good match.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44459992","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
The Fluid-structure Coupling Analysis of Steel-Wire-Reinforced Flexible Pipe Under Inner Fluid Pressure Impact 内流体压力冲击下钢丝增强柔性管流固耦合分析
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-05-13 DOI: 10.13052/EJCM1779-7179.29463
Zhang Shouyuan
{"title":"The Fluid-structure Coupling Analysis of Steel-Wire-Reinforced Flexible Pipe Under Inner Fluid Pressure Impact","authors":"Zhang Shouyuan","doi":"10.13052/EJCM1779-7179.29463","DOIUrl":"https://doi.org/10.13052/EJCM1779-7179.29463","url":null,"abstract":"Identifying dynamic characteristics of the fluid filled steel-wire-reinforced flexible pipe is vital in controlling the pipe vibration. A direct fluid-structure coupling method based on finite element analysis is proposed and validated by modal simulation of an oil filled T-shape pipe. An innovative way of modeling steel-wire-reinforced rubber pipe is put forward. The modeling method is validated by modal test of the water-filled pipe. The 2nd Mooney-Rivlin constitutive model is used for the rubber material. Transient dynamic simulations of a bending steel-wire-reinforced pipe filled with water under step and sine-shape pressure impact are performed for the first time. Different fluid turbulence models are used to evaluate the influences on pipe vibration. The dynamic characteristics of the water filled flexible pipe is researched under different fluid pressures. The vibration peak frequencies of the water-filled pipe under various impact excitations coincide well with the fluid-structure coupling modes of the pipe.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43571738","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
Study the Effect of Air Pulsation on the Flame Characteristics 空气脉动对火焰特性影响的研究
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-03-22 DOI: 10.13052/EJCM2642-2085.29235
M. Magdy, M. Kamal, A. Hamed, A. E. Hussin, Walid Aboelsoud Torky
{"title":"Study the Effect of Air Pulsation on the Flame Characteristics","authors":"M. Magdy, M. Kamal, A. Hamed, A. E. Hussin, Walid Aboelsoud Torky","doi":"10.13052/EJCM2642-2085.29235","DOIUrl":"https://doi.org/10.13052/EJCM2642-2085.29235","url":null,"abstract":"Pulsating combustion is used in a lot of industrial applications like conveyer drying, spray, boilers of commercial scale because its great role in increasing combustion efficiency and producing environmentally friendly combustion products. This paper evaluates how different frequencies (100, 200, 300, 400 and 500) rad/s applied to air velocity view a lot of improvements in the combustion and flow variables (v, T, NO and turbulent kinetic energy) and the effect of adding cross excess air to air pulsation with 500 rad/s frequency on the same flow variables. The performance of pulsating flames was numerically modulated by using Ansys Fluent 16 commercial package by building a 2D combustion chamber of Harwell standard furnace boundary condition on Ansys geometry and divided it into 61000 elements in Ansys meshing 16. Eddy Dissipation Model (EDM) is used to solve transient numerical combustion equations and Detached Eddy Simulation (DES) as viscous model. Converged numerical results have shown that increasing frequency from 100 to 500 rad/s increase average velocities of combustion products and turbulent kinetic energy by 22% and 80 respectively. The pollutant NO decrease by 60% and the time average temperature decrease from 1900 k to 1000 k.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45796279","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
Structural Changes of Circularly Defected Monolayer Circular Graphene Nanosheets Upon Mechanical Vibrations 圆形缺陷单层圆形石墨烯纳米片在机械振动下的结构变化
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-01-10 DOI: 10.13052/EJCM2642-2085.29232
M. Farzannasab, M. M. Khatibi, S. Sadeghzadeh
{"title":"Structural Changes of Circularly Defected Monolayer Circular Graphene Nanosheets Upon Mechanical Vibrations","authors":"M. Farzannasab, M. M. Khatibi, S. Sadeghzadeh","doi":"10.13052/EJCM2642-2085.29232","DOIUrl":"https://doi.org/10.13052/EJCM2642-2085.29232","url":null,"abstract":"As the strongest and toughest material known, graphene has found numerous applications in various types of sensors. Due to the great influences of the graphene sheet’s geometry on resonance frequency, circular defects could effect on expected results of sensors. Circular holes in circular graphene sheets (CGSs) have been modeled with molecular dynamics (MD) simulation in the present work. Then the vibration behavior of intact circular plate and circular sheet with the circular defect has been investigated using frequency-domain analysis (FDD). Furthermore, for validating the used method, the obtained natural frequencies for different graphene sheets have been compared with acquired data in former research. The result of validation showed the accuracy of the used method in this study. The results indicated that by increasing the hole size, the natural frequency of a defected sheet with free edges will be diminished, and with simply-supported interior boundary conditions typically went up. Also, by increasing the hole’s eccentricity, the natural frequency of the defected graphene sheet will be diminished when the hole boundary was subjected to simply-support or free condition.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49577539","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
Buckling and Wrinkling of a Thin Solid Film with Non-uniform Thickness 非均匀厚度固体薄膜的屈曲和起皱
IF 1.2
European Journal of Computational Mechanics Pub Date : 2021-01-10 DOI: 10.13052/EJCM2642-2085.29234
M. Noroozi
{"title":"Buckling and Wrinkling of a Thin Solid Film with Non-uniform Thickness","authors":"M. Noroozi","doi":"10.13052/EJCM2642-2085.29234","DOIUrl":"https://doi.org/10.13052/EJCM2642-2085.29234","url":null,"abstract":"The instability of a strip as a free-standing film and also a deposited film on a substrate is studied in this work. The non-uniform thickness of the film is assumed with a quadratic profile. The problem is categorized under the topic of structural stability and the eigenvalue problem corresponding with the ODE of the system is solved. For the free-standing film, the buckling loads and mode shapes are derived analytically through a closed-form solution. For the substrate-bonded film with a finite length, the uniaxial wrinkling of the film is investigated by using a series solution and a finite difference method and the wrinkling load and wrinkling pattern are characterized. Unlike the wrinkling of thin films with uniform thickness in which the wrinkles propagate along the entire span, it is shown that for the non-uniform film wrinkles are localized near the location with a minimum thickness along the length span; and the wrinkling accumulation is very sensitive to the thickness variations. Therefore, this work is expected to increase the insight into the localization of the wrinkles in thin film-substrate systems in engineering, industry and medical science.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44836733","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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