European Journal of Computational Mechanics最新文献_第10页

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":null,"pages":null},"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

Quasi-Isotropic Initial Triangulation of NURBS Surfaces NURBS曲面的拟各向同性初始三角剖分

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-11-23 DOI: 10.13052/EJCM2642-2085.2912

Daniel Herrero Adan, R. Cardoso

{"title":"Quasi-Isotropic Initial Triangulation of NURBS Surfaces","authors":"Daniel Herrero Adan, R. Cardoso","doi":"10.13052/EJCM2642-2085.2912","DOIUrl":"https://doi.org/10.13052/EJCM2642-2085.2912","url":null,"abstract":"Isotropic triangulation of NURBS surfaces provides high quality triangular meshes, where all triangles are equilateral. This isotropy increases representation quality and analysis accuracy. We introduce a new algorithm to generate quasi-isotropic triangulation on NURBS surfaces at once, with no prior meshing. The procedure consists of one front made of vertexes that advances in a divergence manner avoiding front collision. Vertexes are calculated by intersecting arcs whose radius is estimated by trapezoidal rule integration of directional derivatives. The parameter space is discretized in partitions such that the error of trapezoidal rule is controlled efficiently. A new space, called pattern space, is used to infer the direction of the arcs’ intersection. Derivatives, whose analytical computation is expensive, are estimated by NURBS surface fitting procedures, which increases the speed of the process. The resultant algorithm is robust and efficient. The mesh achieved possesses most of the triangles equilateral and with high uniformity of sizes. The performance is evaluated by measuring angles, vertex valences and size uniformity in different numerical examples.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43654178","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

Modeling and Simulation of Flow and Uranium Isotopes Separation in Gas Centrifuges Using Implicit Coupled Density-Based Solver in OpenFOAM 基于OpenFOAM中隐式耦合密度求解器的气体离心机流动和铀同位素分离建模与仿真

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-07-13 DOI: 10.13052/ejcm2642-2085.2911

V. Ghazanfari, A. Salehi, A. Keshtkar, M. Shadman, M. H. Askari

引用次数: 6

Computation of Second-order Design Sensitivities for Steady State Incompressible Laminar Flows Using the Extended Complex Variables Method 用扩展复变量法计算稳态不可压缩层流的二阶设计灵敏度

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-05-16 DOI: 10.13052/ejcm2642-2085.2863

M. Hassanzadeh

{"title":"Computation of Second-order Design Sensitivities for Steady State Incompressible Laminar Flows Using the Extended Complex Variables Method","authors":"M. Hassanzadeh","doi":"10.13052/ejcm2642-2085.2863","DOIUrl":"https://doi.org/10.13052/ejcm2642-2085.2863","url":null,"abstract":"In the current paper, the general procedure of the first and second-order sensitivity analysis is presented using the extended complex variables method (ECVM). In the traditional complex variables method, only the imaginary step is used for sensitivity analysis. However, in the ECVM, both of the real and imaginary parts are employed to improve the efficiency of the method. To show this, the ECVM is applied to the steady state incompressible laminar flow around a cylinder. The governing Navier-Stokes equations are solved by the finite element method and then the ECVM is employed. The results are validated through comparing with those of obtained by an analytical as well as the finite difference methods and the convergence rate is investigated. It is illustrated that the first-order sensitivity analysis is not influenced by the change of the step length for both of the traditional and extended complex variables methods. However, it is shown that unlike the traditional complex variables method, the ECVM is less dependent on the step size for calculating the second-order sensitivity. This can be considered as an enhancement in the efficiency of this method. Hence, the ECVM is suggested as an appropriate technique for calculating simultaneously the first and second-order sensitivities with high accuracy as well as low computational cost. The proposed method is applicable to a wide range of problems having simple or complex parameters.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48970052","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

Dynamic Finite Element Analysis of Flexible Double Wishbone Suspension Systems with Different Damping Mechanisms 不同阻尼机构柔性双叉骨悬架系统动力学有限元分析

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-03-11 DOI: 10.13052/ejcm2642-2085.2862

Alaa A. Abdel Rahman, A. E. Nabawy, A. Abdelhaleem, S. Ali-Eldin

{"title":"Dynamic Finite Element Analysis of Flexible Double Wishbone Suspension Systems with Different Damping Mechanisms","authors":"Alaa A. Abdel Rahman, A. E. Nabawy, A. Abdelhaleem, S. Ali-Eldin","doi":"10.13052/ejcm2642-2085.2862","DOIUrl":"https://doi.org/10.13052/ejcm2642-2085.2862","url":null,"abstract":"Suspension systems in running vehicles keep the occupants comfortable and isolated from road noise, disturbances, and vibrations and consequently prevent the vehicle from damage and wearing. To attain comfortable and vibration isolation conditions, both material flexibility and damping should be considered in the considered suspension model. This paper presents an incremental finite element model to study and analyze the dynamic behavior of double wishbone suspension systems considering both material flexibility and damping effects. The flexibility of the suspension links are modeled with plane frame element based on Timoshenko beam hypothesis (TBH). On the other hand, the flexibility of joints connecting the suspension links together and with the vehicle chassis is modeled with the revolute joint element. To incorporate the damping effect, viscoelastic, viscous and proportional damping are considered. An incremental viscoelastic constitutive relations, suitable for finite element implementation, are developed. The developed finite element equations of motion are solved using the Newmark technique. The developed procedure is verified by comparing the obtained results with that obtained by the developed analytical solution and an excellent agreement is found. The applicability and effectiveness of the developed procedure are demonstrated by conducting parametric studies to show the effects of the road irregularities profiles, the vehicle speed, and the material damping on the transverse deflection and the resultant stresses of suspension system. Results obtained are supportive in the mechanical design, manufacturing processes of such type of structural systems.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43096028","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 Simulation Using a Modified Solver within OpenFOAM for Compressible Viscous Flows 可压缩粘性流OpenFOAM中改进求解器的数值模拟

IF 1.2

European Journal of Computational Mechanics Pub Date : 2020-03-02 DOI: 10.13052/ejcm2642-2085.2861

V. Ghazanfari, A. Salehi, A. Keshtkar, M. Shadman, M. H. Askari

{"title":"Numerical Simulation Using a Modified Solver within OpenFOAM for Compressible Viscous Flows","authors":"V. Ghazanfari, A. Salehi, A. Keshtkar, M. Shadman, M. H. Askari","doi":"10.13052/ejcm2642-2085.2861","DOIUrl":"https://doi.org/10.13052/ejcm2642-2085.2861","url":null,"abstract":"In this work, we attempted to develop an Implicit Coupled Density-Based (ICDB) solver using LU-SGS algorithm based on the AUSM+ up scheme in OpenFOAM. Then sonicFoam solver was modified to include viscous dissipation in order to improve its capability to capture shock wave and aerothermal variables. The details of the ICDB solver as well as key implementation details of the viscous dissipation to energy equation were introduced. Finally, two benchmark tests of hypersonic airflow over a flat plate and a 2-D cylinder were simulated to show the accuracy of ICDB solver. To verify and validate the ICDB solver, the obtained results were compared with other published experimental data. It was revealed that ICDB solver has good agreement with the experimental data. So it can be used as reference in other studies. It was also observed that ICDB solver enjoy advantages such as high resolution for contact discontinuity and low computational time. Moreover, to investigate the performance of modified sonicFoam, a case study of airflow over the prism was considered. Then the results of the modified sonicFoam were compared with the ICDB, rhoCentralFoam and sonicFoam solvers. The results showed that the modified sonicFoam solver possesses higher accuracy and lower computational time in comparison with the sonicFoam and rhoCentralFoam solvers, respectively.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43651806","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