European Journal of Computational Mechanics最新文献_第8页

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":"1 1","pages":"393–416-393–416"},"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

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":"1 1","pages":"279–302-279–302"},"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":"1 1","pages":"199–222-199–222"},"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":"1 1","pages":"255–278-255–278"},"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

Fracture Prediction Based on Evaluation of Initial Porosity Induced By Direct Energy Deposition 基于直接能量沉积初始孔隙度评价的裂缝预测

IF 1.2

European Journal of Computational Mechanics Pub Date : 2021-01-10 DOI: 10.13052/EJCM2642-2085.29233

R. Darabi, E. Azinpour, J. C. D. César de Sá, M. Machado, Ana Reis, J. Hodek, J. Džugan

引用次数: 4

A Cylindrical Superelement for Thermo-Mechanical Analysis of Thin Composite Vessels 用于复合材料薄型容器热-力学分析的圆柱形超单元

IF 1.2

European Journal of Computational Mechanics Pub Date : 2021-01-03 DOI: 10.13052/ejcm2642-2085.29231

A. Jafarzadeh, A. Taghvaeipour, M. Eslami

引用次数: 1

The Linear and Nonlinear Bending Analyses of Functionally Graded Carbon Nanotube-Reinforced Composite Plates Based on the Novel Four-Node Quadrilateral Element 基于新型四节点四边形单元的功能梯度碳纳米管增强复合材料板的线性和非线性弯曲分析

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-11-30 DOI: 10.13052/ejcm2642-2085.2915

H. Ton-that

引用次数: 3

Cost-Effective Method of Optimization of Stacking Sequences in the Cylindrical Composite Shells Using Genetic Algorithm 基于遗传算法的圆柱复合材料壳体堆垛顺序优化的经济高效方法

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-11-30 DOI: 10.13052/ejcm2642-2085.2914

E. Daneshkhah, R. Jafari Nedoushan, D. Shahgholian, Nima Sina

{"title":"Cost-Effective Method of Optimization of Stacking Sequences in the Cylindrical Composite Shells Using Genetic Algorithm","authors":"E. Daneshkhah, R. Jafari Nedoushan, D. Shahgholian, Nima Sina","doi":"10.13052/ejcm2642-2085.2914","DOIUrl":"https://doi.org/10.13052/ejcm2642-2085.2914","url":null,"abstract":"Buckling is one of the common destructive phenomena, which occurs in composite cylinders subjected to external pressure. In this paper, different methods to optimize stacking sequence of these cylinders are investigated. A finite element model is proposed in order to predict critical buckling pressure and the results are validated with previous experimental data. Theoretical analysis based on NASA SP‐8007 solution and the simplified equation for cylinder buckling of ASME RD-1172 are presented and discussed. The results of theoretical and finite element analysis and experimental tests are compared for both glass and carbon epoxy cylinders. Using NASA and ASME formulations, optimal laminations of cylinders in order to maximize buckling pressure, are obtained by genetic algorithm method. Suggested laminations and the values of corresponding critical buckling pressure calculated by finite element analysis, are presented and compared in various states. Obtained results show that while predicted buckling loads of finite element analysis are reliable, NASA formulation can be used in a very cost-effective method to optimize the buckling problems.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":"1 1","pages":"115–138-115–138"},"PeriodicalIF":1.2,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43221981","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: 5

Design Embodiments Using Squeeze-Film Phenomenon to Attain Complete Separation of Contacting Surfaces 利用挤压膜现象实现接触面完全分离的设计实施例

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-11-30 DOI: 10.13052/ejcm2642-2085.2913

C. Mares, M. Atherton, M. Miyatake, T. Stolarski

引用次数: 0