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Journal of Multiscale Modelling最新文献

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Free Vibration Analysis of Carbon Fiber-Carbon Nanotube-Polymer Matrix Composite Plates by a Finite Element-Based Multi-Scale Modeling Approach 基于有限元多尺度建模的碳纤维-碳纳米管-聚合物基复合材料板自由振动分析
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-11-09 DOI: 10.1142/S1756973718500026
M. Ahmadi, R. Ansari, H. Rouhi
{"title":"Free Vibration Analysis of Carbon Fiber-Carbon Nanotube-Polymer Matrix Composite Plates by a Finite Element-Based Multi-Scale Modeling Approach","authors":"M. Ahmadi, R. Ansari, H. Rouhi","doi":"10.1142/S1756973718500026","DOIUrl":"https://doi.org/10.1142/S1756973718500026","url":null,"abstract":"The vibrational behavior of polymer matrix nanocomposite plates reinforced with carbon fibers (CFs) and carbon nanotubes (CNTs) is studied using the finite element method based on a multi-scale modeling approach. The influences of nano- and micro-scale are coupled through a two-step procedure. First, CNTs are dispersed into the polymer matrix. In the selected representative volume element (RVE), interphase due to chemical interaction between CNT and polymer matrix is considered. Also, the state of dispersion of CNTs into the matrix is assumed to be random. In the second step, CFs are randomly distributed in the reinforced polymer with CNTs. The reinforcement is carried out for various volume fractions of CFs and CNTs. Two three-dimensional models including the brick and shell ones are used to generate the results. Moreover, the analysis is presented for square plates under different types of boundary conditions. The effect of nanocomposite thickness on its vibrational response is also investigated.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2017-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718500026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45163325","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: 7
Stress Wave Propagation in Cracked Geological Solids Using Finite Difference Scheme 应力波在有裂纹地质实体中的有限差分传播
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-09-21 DOI: 10.1142/S1756973717500093
P. Kakavas, Nicos A. Kalapodis
{"title":"Stress Wave Propagation in Cracked Geological Solids Using Finite Difference Scheme","authors":"P. Kakavas, Nicos A. Kalapodis","doi":"10.1142/S1756973717500093","DOIUrl":"https://doi.org/10.1142/S1756973717500093","url":null,"abstract":"The aim of this study is the numerical computation of the wave propagation in crack geological solids. The finite difference method was applied to solve the differential equations involved in the problem. Since the problem is symmetric, we prefer to use this technique instead of the finite element method and/or boundary elements technique. A comparison of the numerical results with analytical solutions is provided.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"09 1","pages":"1750009"},"PeriodicalIF":1.5,"publicationDate":"2017-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973717500093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43197338","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
Symmetrical or Non-Symmetrical Debonds at Fiber-Matrix Interfaces: A Study by BEM and Finite Fracture Mechanics on Elastic Interfaces 纤维-基体界面的对称或非对称粘结:边界元法和弹性界面有限断裂力学的研究
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-09-01 DOI: 10.1142/S175697371740008X
M. Muñoz-Reja, L. Távara, V. Mantič
{"title":"Symmetrical or Non-Symmetrical Debonds at Fiber-Matrix Interfaces: A Study by BEM and Finite Fracture Mechanics on Elastic Interfaces","authors":"M. Muñoz-Reja, L. Távara, V. Mantič","doi":"10.1142/S175697371740008X","DOIUrl":"https://doi.org/10.1142/S175697371740008X","url":null,"abstract":"A recently proposed criterion is used to study the behavior of debonds produced at a fiber–matrix interface. The criterion is based on the Linear Elastic–(Perfectly) Brittle Interface Model (LEBIM) combined with a Finite Fracture Mechanics (FFM) approach, where the stress and energy criteria are suitably coupled. Special attention is given to the discussion about the symmetry of the debond onset and growth in an isolated single fiber specimen under uniaxial transverse tension. A common composite material system, glass fiber–epoxy matrix, is considered. The present methodology uses a two-dimensional (2D) Boundary Element Method (BEM) code to carry out the analysis of interface failure. The present results show that a non-symmetrical interface crack configuration (debonds at one side only) is produced by a lower critical remote load than the symmetrical case (debonds at both sides). Thus, the non-symmetrical solution is the preferred one, which agrees with the experimental evidences found in the literature.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"08 1","pages":"1740008"},"PeriodicalIF":1.5,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S175697371740008X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45737867","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: 3
Modeling of Cementitious Representative Volume Element with Additives 掺加添加剂的水泥基代表性体积单元建模
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-05-04 DOI: 10.1142/S1756973717500032
M. Shahzamanian, W. Basirun
{"title":"Modeling of Cementitious Representative Volume Element with Additives","authors":"M. Shahzamanian, W. Basirun","doi":"10.1142/S1756973717500032","DOIUrl":"https://doi.org/10.1142/S1756973717500032","url":null,"abstract":"CEMHYD3D has been employed to simulate the representative volume element (RVE) of cementitious systems (Type I cement) containing fly ash (Class F) through a voxel-based finite element analysis (FEA) approach. Three-dimensional microstructures composed of voxels are generated for a heterogeneous cementitious material consisting of various constituent phases. The primary focus is to simulate a cementitious RVE containing fly ash and to present the homogenized macromechanical properties obtained from its analysis. Simple kinematic uniform boundary conditions as well as periodic boundary conditions were imposed on the RVE to obtain the principal and shear moduli. Our current work considers the effect of fly ash percentage on the elastic properties based on the mass and volume replacements. RVEs with lengths of 50, 100 and 200μm at different degrees of hydration are generated, and the elastic properties are modeled and simulated. In general, the elastic properties of a cementitious RVE with fly ash replacement for cement based on mass and volume differ from each other. Moreover, the finite element (FE) mesh density effect is studied. Results indicate that mechanical properties decrease with increasing mesh density.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"08 1","pages":"1750003"},"PeriodicalIF":1.5,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973717500032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42262120","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: 3
Improvement of Stress Intensity Factor Analysis Using Overall Defined Basic Density Function on Crack Face 用广义基本密度函数改进裂纹面应力强度因子分析
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-05-03 DOI: 10.1142/S1756973717500068
Md. Abdul Hasib, Yohei Sonobe, A. Saimoto
{"title":"Improvement of Stress Intensity Factor Analysis Using Overall Defined Basic Density Function on Crack Face","authors":"Md. Abdul Hasib, Yohei Sonobe, A. Saimoto","doi":"10.1142/S1756973717500068","DOIUrl":"https://doi.org/10.1142/S1756973717500068","url":null,"abstract":"In this study, an improved technique for the evaluation of stress intensity factor (SIF) along the 3D planar crack front is proposed. In the present analysis, a planar triangular element is used to cover the total crack face. The stress field induced by a body force doublet in an infinite body is used for a fundamental solution. In the present analysis, overall defined basic density function of body force doublet is introduced. The crack problem is formulated as hypersingular boundary integral equations and the magnitudes of distributed point force doublets are determined through boundary conditions. The numerical SIF solution obtained using the present approach was compared with the solution obtained using the conventional basic density function. The results indicate that the proposed technique improves the accuracy of SIF. In addition, some numerical examples were examined to verify the effectiveness and the robustness of the proposed technique.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"09 1","pages":"1750006"},"PeriodicalIF":1.5,"publicationDate":"2017-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973717500068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47587837","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
A Numerical Homogenization Scheme for Glass Particle-Toughened Polymers Under Dynamic Loading 动态载荷下玻璃颗粒增韧聚合物的数值均匀化方案
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-02-22 DOI: 10.1142/S1756973717500019
A. Karamnejad, A. Ahmed, L. Sluys
{"title":"A Numerical Homogenization Scheme for Glass Particle-Toughened Polymers Under Dynamic Loading","authors":"A. Karamnejad, A. Ahmed, L. Sluys","doi":"10.1142/S1756973717500019","DOIUrl":"https://doi.org/10.1142/S1756973717500019","url":null,"abstract":"A numerical homogenization scheme is presented to model glass particle-toughened polymer materials under dynamic loading. A constitutive law is developed for the polymer material and validated by comparing the results to experimental test data. A similar constitutive law as that of the polymer material with unknown material parameters is assumed for the glass particle-toughened polymer. A homogenization scheme is used to determine the unknown material parameters from the boundary value problem (BVP) of a representative volume element. Unlike the standard computational homogenization scheme, the proposed numerical homogenization scheme can be used after localization occurs in the material. The proposed multiscale model is then verified against direct numerical simulation.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"08 1","pages":"1750001"},"PeriodicalIF":1.5,"publicationDate":"2017-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973717500019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41950994","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: 3
Multi-Scale Impact and Compression-After-Impact Modeling of Reinforced Benzoxazine/Epoxy Composites using Micromechanics Approach 基于细观力学方法的增强苯并恶嗪/环氧复合材料多尺度冲击及冲击后压缩模型
IF 1.5
Journal of Multiscale Modelling Pub Date : 2017-02-22 DOI: 10.1142/S1756973717500020
M. Montero, E. Barjasteh, H. Baid, C. Godines, F. Abdi, K. Nikbin
{"title":"Multi-Scale Impact and Compression-After-Impact Modeling of Reinforced Benzoxazine/Epoxy Composites using Micromechanics Approach","authors":"M. Montero, E. Barjasteh, H. Baid, C. Godines, F. Abdi, K. Nikbin","doi":"10.1142/S1756973717500020","DOIUrl":"https://doi.org/10.1142/S1756973717500020","url":null,"abstract":"A multi-scale micromechanics approach along with finite element (FE) model predictive tool is developed to analyze low-energy-impact damage footprint and compression-after-impact (CAI) of composite laminates which is also tested and verified with experimental data. Effective fiber and matrix properties were reverse-engineered from lamina properties using an optimization algorithm and used to assess damage at the micro-level during impact and post-impact FE simulations. Progressive failure dynamic analysis (PFDA) was performed for a two step-process simulation. Damage mechanisms at the micro-level were continuously evaluated during the analyses. Contribution of each failure mode was tracked during the simulations and damage and delamination footprint size and shape were predicted to understand when, where and why failure occurred during both impact and CAI events. The composite laminate was manufactured by the vacuum infusion of the aero-grade toughened Benzoxazine system into the fabric preform. Delamination footprint was measured using C-scan data from the impacted panels and compared with the predicated values obtained from proposed multi-scale micromechanics coupled with FE analysis. Furthermore, the residual strength was predicted from the load-displacement curve and compared with the experimental values as well.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"08 1","pages":"1750002"},"PeriodicalIF":1.5,"publicationDate":"2017-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973717500020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44734820","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
Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle 初始斜面裂纹对铁路车轴估计剩余疲劳寿命的影响
IF 1.5
Journal of Multiscale Modelling Pub Date : 2016-11-30 DOI: 10.1142/S1756973716400072
L. Náhlík, P. Pokorný, M. Ševčík, P. Hutař
{"title":"Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle","authors":"L. Náhlík, P. Pokorný, M. Ševčík, P. Hutař","doi":"10.1142/S1756973716400072","DOIUrl":"https://doi.org/10.1142/S1756973716400072","url":null,"abstract":"Railway axles are subjected to cyclic loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect on railway axle surface is often required. The contribution deals with an estimation of residual fatigue lifetime of railway axle with initial inclined surface crack. 3D numerical model of inclined semi-elliptical surface crack in railway axle was developed and its curved propagation through the axle was simulated by finite element method. Presence of press-fitted wheel in the vicinity of initial crack was taken into account. A typical loading spectrum of railway axle was considered and residual fatigue lifetime was estimated by NASGRO approach. Material properties of typical axle steel EA4T were considered in numerical calculations and lifetime estimation.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"07 1","pages":"1640007"},"PeriodicalIF":1.5,"publicationDate":"2016-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973716400072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64017150","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
Assessment of impact detection tchniques for aeronautical application: ANN vs. LSSVM 航空应用的冲击检测技术评估:神经网络与LSSVM
IF 1.5
Journal of Multiscale Modelling Pub Date : 2016-11-30 DOI: 10.1142/S1756973716400059
Nan Yue, Z. S. Khodaei
{"title":"Assessment of impact detection tchniques for aeronautical application: ANN vs. LSSVM","authors":"Nan Yue, Z. S. Khodaei","doi":"10.1142/S1756973716400059","DOIUrl":"https://doi.org/10.1142/S1756973716400059","url":null,"abstract":"The impact localization in composite panels is assessed using two machine learning techniques: least square support vector machines (LSSVM) and artificial neural networks (ANN) with local strain signals from piezoelectric sensors. Sensor signals from impact experiments on a composite plate as well as signals simulated by a finite element model are used to train and test models. A comparative study shows that LSSVM achieves better accuracy than ANN on identifying location of impacts for a combination of large mass impact and small mass impact, in particular when less data is available for training which is more appropriate for real aeronautical application. Additionally, LSSVM is more capable of identifying new impact events which have not been considered in the training process.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"07 1","pages":"1640005"},"PeriodicalIF":1.5,"publicationDate":"2016-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973716400059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64017108","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: 19
Fracture Mechanical Analysis of Open Cell Ceramic Foams Under Thermal Shock Loading 热冲击载荷下开孔泡沫陶瓷的断裂力学分析
IF 1.5
Journal of Multiscale Modelling Pub Date : 2016-11-30 DOI: 10.1142/S1756973716400060
Christoph Settgast, M. Abendroth, M. Kuna
{"title":"Fracture Mechanical Analysis of Open Cell Ceramic Foams Under Thermal Shock Loading","authors":"Christoph Settgast, M. Abendroth, M. Kuna","doi":"10.1142/S1756973716400060","DOIUrl":"https://doi.org/10.1142/S1756973716400060","url":null,"abstract":"Ceramic foams made by replica techniques containing sharp-edged cavities, which are potential crack initiators and therefore have to be analyzed using fracture mechanical methods. The ceramic foams made of novel carbon bonded alumina are used as filters in metal melt filtration applications, where the filters are exposed to a thermal shock. During the casting process the filters experience a complex thermo-mechanical loading, which is difficult to measure. Modern numerical methods allow the simulation of such complex processes. As a simplified foam structure an open Kelvin cell is used as a representative volume element. A three-dimensional finite element model containing realistic sharp-edged cavities and three-dimensional sub-models along these sharp edges are used to compute the transient temperature, stress and strain fields at the Kelvin foam. The sharp edges are evaluated using fracture mechanical methods like the J-integral technique. The results of this study describe the influence of the pore size, relative density of the ceramic foam, the heat transfer and selected material parameters on the fracture mechanical behaviour.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"07 1","pages":"1640006"},"PeriodicalIF":1.5,"publicationDate":"2016-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973716400060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64017115","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
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