International Journal of Engineering Science最新文献_第6页

Negative electrical conductivity metamaterials and their properties

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-12-18 DOI: 10.1016/j.ijengsci.2024.104198

Edward Bormashenko

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Size-dependent stability of embedded beams with variable cross section

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-12-18 DOI: 10.1016/j.ijengsci.2024.104210

Ömer Civalek , Bekir Akgöz

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On nonlinear 3D electro-elastic numerical modeling of two-phase inhomogeneous FG piezocomposites reinforced with GNPs GNPs增强两相非均匀FG压电复合材料的非线性三维电弹数值模拟

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-27 DOI: 10.1016/j.ijengsci.2024.104174

Mohammad Malikan , Shahriar Dastjerdi , Magdalena Rucka , Mehran Kadkhodayan

{"title":"On nonlinear 3D electro-elastic numerical modeling of two-phase inhomogeneous FG piezocomposites reinforced with GNPs","authors":"Mohammad Malikan , Shahriar Dastjerdi , Magdalena Rucka , Mehran Kadkhodayan","doi":"10.1016/j.ijengsci.2024.104174","DOIUrl":"10.1016/j.ijengsci.2024.104174","url":null,"abstract":"<div><div>The novelty here comes from not only the perfect nonlinear three-dimensional (3D) electro-elasticity investigation but also the mixed material itself. The literature widely showed mechanical assessments on the piezoelectric structures; however, a lack of nonlinear three-dimensional elasticity studies has been witnessed on these kinds of smart materials. Therefore, a nonlinear 3D elasticity-piezoelectricity coupling is considered in this study. What is more, this research brings about an era in the field of sensing manufacturing such as sensors and actuators by proposing the construction of these devices in an advanced composite framework. The piezoelectric medium can be electro-mechanically improved with the aggregation of graphene platelets/nanoplatelets (GPLs/GNPs) based on the functionally graded (FG) composition. The assumption for such a smart composite has been made to provide higher flexibility smart tools while their elastic strength can also get further. To accomplish this, the derivation of a rigorous mathematical model has come out for a transversely isotropic inhomogeneous FG-piezoelectric beam-like sensor/actuator using 3D kinematic displacements, geometrically nonlinear strains, Lagrange technique, 3D stress-strains tensors, linear elastic material, and in particular Halpin-Tsai micro-mechanic model. Numerical modeling has been built by the generalized differential quadrature (GDQ) technique. A comprehensive parametric study has also been established for intelligent FG beams.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"207 ","pages":"Article 104174"},"PeriodicalIF":5.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Large deflection of a nonlocal gradient cantilever beam 非局部梯度悬臂梁的大变形

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-19 DOI: 10.1016/j.ijengsci.2024.104172

Daniele Ussorio , Marzia Sara Vaccaro , Raffaele Barretta , Raimondo Luciano , Francesco Marotti de Sciarra

{"title":"Large deflection of a nonlocal gradient cantilever beam","authors":"Daniele Ussorio , Marzia Sara Vaccaro , Raffaele Barretta , Raimondo Luciano , Francesco Marotti de Sciarra","doi":"10.1016/j.ijengsci.2024.104172","DOIUrl":"10.1016/j.ijengsci.2024.104172","url":null,"abstract":"<div><div>Analysing scale phenomena in nanostructures is crucial for modelling and optimizing modern nanotechnological devices. Notably, soft nanostructures can be effectively designed as basic components of smart electro-mechanical systems that require geometrically nonlinear analyses as their structural parts undergo large deflection. Adoption of non-conventional approaches for accurate assessment of size effects is thus needed. The paper investigates the elastostatic behaviour of small-scale beams experiencing large displacements exploiting a consistent model of integral gradient elasticity. An iterative analytical solution procedure is proposed to address the geometrically nonlinear problem of soft nanobeams. The presented nonlocal stress gradient methodology is able to capture both stiffening and softening size-dependent nonlinear responses, thus generalizing the outcomes contributed by <span><span>Vaccaro (2022)</span></span>. Effectiveness of the proposed approach for modelling and designing next-generation smart devices is finally shown by solving applicative nanomechanical problems. The presented methodology can be further extended to nonlinear analyses of three-dimensional nanocontinua to capture size effects of arbitrarily shaped structures undergoing large configuration changes.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104172"},"PeriodicalIF":5.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Elastic active matter — A composite mechanics approach via non-interaction approximation 弹性活性物质--通过非相互作用近似的复合力学方法

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-17 DOI: 10.1016/j.ijengsci.2024.104170

Ivan I. Argatov , Federico J. Sabina

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On size-dependent mechanics of Mindlin plates made of polymer networks 聚合物网络明德林板的力学尺寸依赖性

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-15 DOI: 10.1016/j.ijengsci.2024.104164

Xiao-Jian Xu , Bo Wang

{"title":"On size-dependent mechanics of Mindlin plates made of polymer networks","authors":"Xiao-Jian Xu , Bo Wang","doi":"10.1016/j.ijengsci.2024.104164","DOIUrl":"10.1016/j.ijengsci.2024.104164","url":null,"abstract":"<div><div>The recent advances of solid mechanics of polymer networks are that they can be well-modelled by a physically-based size-dependent constitutive relation via a simplified strain gradient elasticity theory. However, boundary value problems of plate models composed of polymer networks have not been reported, which limit wide applications of the models in the engineering science. In this paper, we systematically established a variationally consistent boundary value problems of Mindlin plate models for polymer networks leading to the framework of a simplified strain gradient elasticity. This study considers the strain energy produced by the strain gradient in the thickness direction and proposes a well-posed boundary value problem for a Mindlin plate with arbitrary boundaries, discussing possible boundary conditions, especially higher-order nonconventional ones. The senses of stress resultants and double stresses acting on the face of a volume element are firstly explained. Surprisingly, it is found that unexpected corner condition related to normal derivatives of shear force, bending moment, and twisting moment exists for plates with irregular boundaries—contradicting conventional mechanics notions of plates. For illustrative purpose, static bending analyses of a simply supported rectangular plate subjected to a uniformly distributed loading and a concentrated loading are provided. The effective Young's modulus predicted by this approach agrees well with reported result in the open literature. This work may be helpful in developing efficient numerical methods and offers new insights into the existence of corner condition in Mindlin plates within the context of a simplified strain gradient elasticity theory.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104164"},"PeriodicalIF":5.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Eshelby's inhomogeneity model within Mindlin's first strain gradient elasticity theory and its applications in composite materials Mindlin 第一应变梯度弹性理论中的 Eshelby 不均匀性模型及其在复合材料中的应用

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-13 DOI: 10.1016/j.ijengsci.2024.104167

Koami P. DADABO, Napo BONFOH, Hafid SABAR, Rodrigue MATADI-BOUMBIMBA

{"title":"Eshelby's inhomogeneity model within Mindlin's first strain gradient elasticity theory and its applications in composite materials","authors":"Koami P. DADABO, Napo BONFOH, Hafid SABAR, Rodrigue MATADI-BOUMBIMBA","doi":"10.1016/j.ijengsci.2024.104167","DOIUrl":"10.1016/j.ijengsci.2024.104167","url":null,"abstract":"<div><div>Eshelby's inhomogeneity problem is solved within the second form of Mindlin's first strain gradient elasticity theory for the prediction of the effective elastic properties of composites. Considering Green's function technique, an integral equation is established for an ellipsoidal inhomogeneity embedded in a homogeneous elastic medium and subjected to non-uniform boundary conditions. Within isotropic elasticity, the mean strain inside a spherical inhomogeneity is detailed to provide analytical results. In addition to the elastic properties of the inhomogeneity and the matrix, the strain localization depends on five gradient elastic constants, introduced by the first strain gradient elasticity theory. The effective bulk and shear moduli of a two-phase composite are predicted through Mori-Tanaka's scheme. The strain localization and the effective elastic moduli are then expressed within some simplified gradient elasticity theories. To test the relevance of the developed model, its predictions are compared with those of some investigations and the effective elastic properties are analyzed for a metal matrix composite. Finally, some comparisons with experimental data are performed to estimate the characteristic length scale parameters and gradient elastic constants of local phases.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104167"},"PeriodicalIF":5.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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An energy-based fracture criterion for quasi-brittle crack propagation in micropolar continuum: Analytical and numerical study 微连续体中准脆性裂纹扩展的基于能量的断裂准则：分析和数值研究

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-08 DOI: 10.1016/j.ijengsci.2024.104173

Meral Tuna , Patrizia Trovalusci , Nicholas Fantuzzi

{"title":"An energy-based fracture criterion for quasi-brittle crack propagation in micropolar continuum: Analytical and numerical study","authors":"Meral Tuna , Patrizia Trovalusci , Nicholas Fantuzzi","doi":"10.1016/j.ijengsci.2024.104173","DOIUrl":"10.1016/j.ijengsci.2024.104173","url":null,"abstract":"<div><div>The present study provides closed-form expressions of propagation (kinking) angles by generalizing maximum energy release rate criterion in linear elastic fracture mechanics (LEFM) within micropolar theory of elasticity to address the in-plane, brittle crack propagation phenomenon in size-dependent materials with the presence of particle rotations.</div><div>The accuracy and limitations of the derived formulation is checked by manually detecting the peak point of the energy release rate (ERR) through repetitive numerical simulations performed for arbitrary orientations of infinitesimal branch crack, modelled via magnifying the corresponding region with proper boundary conditions. In both approaches (analytical and numerical), the basic fracture parameters (i.e. stress and couple-stress intensity factors at the main or infinitesimal branch tip) are attained with the aid of micropolar/extended-FEM (micropolar/XFEM) model.</div><div>Through the parametric study, performed for numerous material properties and loading conditions, it is revealed that, as non-locality increases, the variation of propagation angle with the mode mixity ratio substantially diverges from that in Cauchy continuum. It is manifested as a change in the trend of angle-mode mixity ratio curve, and dominated by the stress related intensity factors in the absence of non-singular terms for the considered example. Having a branch orientation approaching to crack’s axis with increased non-locality indicates the practical importance of resorting to non-classical theories for materials with scale effects such as particulate composites, masonry walls, rock-like assemblages, etc. following their disposition to fracture type failure. Moreover, the proposed fracture criterion enables crack propagation simulations within the framework of LEFM by integrating the formulation into a numerical method.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104173"},"PeriodicalIF":5.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A generalized differential scheme for the effective conductivity of percolating microinhomogeneous materials with the Hall effect 利用霍尔效应计算渗流微均质材料有效电导率的广义微分方案

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-06 DOI: 10.1016/j.ijengsci.2024.104175

Anatoly Markov , Mikhail Markov , Valery Levin

{"title":"A generalized differential scheme for the effective conductivity of percolating microinhomogeneous materials with the Hall effect","authors":"Anatoly Markov , Mikhail Markov , Valery Levin","doi":"10.1016/j.ijengsci.2024.104175","DOIUrl":"10.1016/j.ijengsci.2024.104175","url":null,"abstract":"<div><div>In this paper, we propose a self-consistent scheme for the calculation of the components of the effective electrical conductivity tensor. The calculations were fulfilled for a microinhomogeneous material, the components of which have the Hall effect. The presence of the Hall effect leads to appearance of asymmetry of the components of the conductivity tensor and to dependence of these components on the magnitude of the magnetic field applied to the material. Our approach is based on the Generalized Differential Effective Medium (GDEM) method. This method generalizes the classical differential scheme (DEM) for the case of several inclusion types instead of one. In this case, the GDEM scheme leads to a system of matrix differential equations that were solved numerically. This solution was obtained for materials containing spherical or cylindrical inclusions (3D and 2D-problems). In the case of cylindrical inclusions, the results were obtained for inclusions with the symmetry axes orthogonal to the magnetic field. The application of the GDEM method allows us to consider the percolation effect for 2D and 3D-microheterogeneous materials. The results obtained are compared to the experimental data and the calculation results obtained by other self-consistent schemes.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104175"},"PeriodicalIF":5.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Dilatational disk and finite cylindrical inclusion in elastic nanowire 弹性纳米线中的扩张盘和有限圆柱包涵体

IF 5.7 1区工程技术

International Journal of Engineering Science Pub Date : 2024-11-05 DOI: 10.1016/j.ijengsci.2024.104169

Anna L. Kolesnikova , Nguyen Van Tuyen , Mikhail Yu. Gutkin , Alexey E. Romanov

{"title":"Dilatational disk and finite cylindrical inclusion in elastic nanowire","authors":"Anna L. Kolesnikova , Nguyen Van Tuyen , Mikhail Yu. Gutkin , Alexey E. Romanov","doi":"10.1016/j.ijengsci.2024.104169","DOIUrl":"10.1016/j.ijengsci.2024.104169","url":null,"abstract":"<div><div>For the first time, strict analytical solutions for the elastic fields and the strain energies of an infinitely thin dilatational disk (DD) and a dilatational cylindrical inclusion (CyI) of finite length coaxially embedded in an infinite elastically isotropic cylinder with free surface are given and analyzed in detail. The solutions are represented in an integral form that is suitable for further analytical use and numerical study. The screening effect of the cylinder free surface on the elastic fields and the strain energies of the DD and the CyI is discussed. It is shown that this effect is significant for both the axial displacement and stress fields when the DD and CyI radii are comparable with the cylinder radius, however it is rather weak for the DD strain energy (the energy release does not exceed ∼10%). In contrast, for the CyI strain energy, the screening effect can be very strong. It is also shown that the hydrostatic stress is inhomogeneous and exists not only inside the CyI, as is the case with this stress for inclusions in an infinite medium, but also outside it. This stress is concentrated on the free surface at the points that are closest to the CyI boundary. Inside the CyI, the hydrostatic stress is much higher in magnitude than outside it.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104169"},"PeriodicalIF":5.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0