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Coarse–grained modeling with hierarchical deformable and rigid assemblages (HiDRA) Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210722
A.Yu. Panchenko, E.A. Podolskaya, I.E. BerinskiiOne of the major challenges in computational mechanics of materials remains to bridge the lengthscale and timescale gaps between the computational and experimental methods to study the microstructure of materials. Traditional molecular dynamics is a powerful tool at the nanoscale, but it does not allow to simulate such mechanical experiments as AFM microscopy dealing with submicrometric lengths

A nonlinear molecular mechanics model for graphene subjected to large inplane deformations Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210713
Matteo Pelliciari, Angelo Marcello TarantinoIn this paper we present a fully nonlinear stickandspring model for graphene subjected to inplane deformations. The constitutive behaviors of sticks and springs are defined, respectively, by the modified Morse potential and a nonlinear bond angle potential. The equilibrium equations of the representative cell are written considering large displacements of the nodes (atoms) and the stability of the

Thermomechanical modeling of viscoelastic crystallizable shape memory polymers Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210712
Aayush Prasad, Swapnil Moon, I. Joga. RaoShape memory polymers (SMPs) are a class of soft active materials that have the ability to retain one or multiple temporary shapes and exhibit deformation as a response to stimuli. The temporary shapes involved can be very complex but SMPs can recover large amounts of strains as compared to other smart materials. They have a wide range of applications in fields as diverse as healthcare, transportation

Wrinkled and wrinklefree membranes Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210711
Ming Li, Kexi Zhu, Guangliang Qi, Zhan Kang, Yangjun LuoThe extreme outofplane flexibility makes membranes vulnerable of wrinkling, which limits the applications with stringentaccuracy demands and highfrequency requirements. In this study, a theoretical analysis is proposed to predict the minimum of minprincipal stress min(σmin), representing the wrinkling capability of the stretched membrane with an arbitrary aspect ratio and random curved edges,

Modeldatadriven constitutive responses: Application to a multiscale computational framework Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210709
Jan Niklas Fuhg, Christoph Böhm, Nikolaos Bouklas, Amelie Fau, Peter Wriggers, Michele MarinoComputational multiscale methods for analyzing and deriving constitutive responses have been used as a tool in engineering problems because of their ability to combine information at different length scales. However, their application in a nonlinear framework can be limited by high computational costs, numerical difficulties, and/or inaccuracies. In this paper, a hybrid methodology is presented which

Quantifying deep cryogenic treatment extent and its effect on steel properties Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210707
Paul A. Funk, Ahmed Kanaan, Christine Shank, Peter Cooke, Igor Sevostianov, Joe W. Thomas, Michael O. PateDeep cryogenic treatment (DCT) has been known since the 1930s to improve hardness, fatigue resistance, and wear resistance of steel. While the effect of DCT on wear properties has been well documented, there is no consensus regarding the causal mechanisms, nor a widely accepted quantitative description of them. DCT transforms retained austenite into martensite and triggers the precipitation of fine

Pathogenesis of atherosclerosis and its influence on local hemodynamics: A comparative FSI study in healthy and mildly stenosed carotid arteries Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210703
Aditya Bantwal, Aditya Singh, Abhay Ramachandran Menon, Nitesh KumarAtherosclerosis is one of the most dangerous forms of Cardiovascular disease (CVD) due to its asymptomatic nature during its early stages of development. The carotid sinus is a favorable location for plaque progression because of the temporal disturbances experienced in its environment. By performing a transient FluidStructure Interaction (FSI) on a healthy idealized carotid artery, zones of low Wall

Effect of stresses on wave propagation in fluidsaturated porous media Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210701
Jinxia Liu, Zhiwen Cui, Igor SevostianovThe mechanism of the effect of stresses on wave propagation in a fluidsaturated porous media has not been well understood. The goal of this paper is to fill this gap. First we formulated the general equations of motion in a homogeneously prestressed fluidsaturated medium and use them to derive explicit expressions of velocity dependence on stresses. Equations for fast and slow longitudinal waves

The temperaturedependent thermoelastic problem of an elliptic inhomogeneity embedded in an infinite matrix Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210627
Kunkun Xie, Haopeng Song, Cunfa GaoAn inhomogeneity embedded in a continuum medium is a classical problem in solids that dates back to Maxwell, and the fields within an ellipsoidal inhomogeneity governed by temperatureindependent constitutive law are well known to be uniform, rendering them important applications in composite analysis. The thermoelastic problem of an inhomogeneity in temperaturedependent medium, on the other hand

Quantifying the effect of twopoint correlations on the effective elasticity of specific classes of random porous materials with and without connectivity Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210627
O. Zerhouni, S. Brisard, K. DanasIt is wellknown by now that the Hashin–Shtrikman bounds imply that the twopoint correlation functions are not in general sufficient to estimate accurately the response of composites, especially when their underlying phases exhibit infinite contrast, e.g., porous materials. Starting from this longstanding, albeit qualitative result, this work investigates quantitatively the relevance of using twopoint

Transient Green's functions of a buried pulse in a constrained transversely isotropic halfspace Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210622
Mehdi RaoofianNaeeni, Morteza EskandariGhadi, Ernian PanIn this paper, transient surface Green's functions (GFs) excited by a general dynamic pulse buried in a constrained transversely isotropic (TI) halfspace are derived in analytical forms. The constrained transverse isotropy is defined by an explicit relation that expresses one of the five elastic constants in terms of the other four independent constants so that no coupled PSV wave exists. Use is

Importance of microstructure modeling for additively manufactured metal postprocess simulations Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210619
Sumair Sunny, Glenn Gleason, Karl Bailey, Ritin Mathews, Arif Malik 
On the mechanical analysis of microcrystalline cellulose sheets Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210605
Shahriar Dastjerdi, Fatemeh Naeijian, Bekir Akgöz, Ömer CivalekIn this research, it has been tried to study the mechanical behavior of a micro annular circular sheet made of microcrystalline cellulose material. A new combination between the modified higherorder shear deformation, also, quasithreedimensional displacement fields and the modified couple stress theory has been presented for simulating the mentioned microsheet under the transverse loading. Consequently

On some basic aspects of flexoelectricity in the mechanics of materials Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210605
Anqing Li, Binglei Wang, Shengyou YangFlexoelectricity is an interesting electromechanical coupling that exists in all dielectrics when the deformation is inhomogeneous. The intensity of flexoelectricity is highly related to the deformation gradient and the dimensions of dielectric structures. Although flexoelectricity plays a significant role in micro/nano devices' behaviors, the complexity of electromechanical coupling impedes the

Constitutive modeling of magnetoviscoelastic polymers, demagnetization correction, and fieldinduced Poynting effect Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210604
Krishnendu HaldarMagnetoactive polymers are polymerbased composites consisting of magnetizable microparticles embedded in an elastomeric matrix material. The presence of magnetic particles provides strong tunability to the stiffness and damping properties of the polymeric composites under the magnetic field. We propose here a novel free energybased phenomenological modeling for magnetoactive polymers. Coupled

A viscoelastic Eshelby inclusion model and analysis of the CellinGel system Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210602
Mohammad A. KazemiLari, John A. Shaw, Alan S. Wineman, Rafael Shimkunas, Zhong Jian, Bence Hegyi, Leighton Izu, Ye ChenIzuWe develop a viscoelastic generalization of the elastic Eshelby inclusion solution, where the inclusion and surrounding matrix are two different viscoelastic solids and the inclusion’s eigenstrain is a timeperiodic oscillatory input. The solution exploits the Correspondence Principle of Linear Viscoelasticity and a Discrete Fourier Transform to efficiently capture the steadystate oscillatory behavior

Mechanics of hyperelastic composites reinforced with nonlinear elastic fibrous materials in finite plane elastostatics Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210529
Suprabha Islam, Seyed Ehsan Seyed Bolouri, ChunIl KimA model for the mechanics of a hyperelastic material reinforced with unidirectional and bidirectional fibers is presented in finite plane elastostatics. This includes the refinement/development of a series of continuumbased prediction models to accommodate the nonlinear responses of both the matrix material and the reinforcing fibers. The kinematics of the embedded fibers, including the torsional

Energy release rate, the crack closure integral and admissible singular fields in fracture mechanics Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210525
Andrea Piccolroaz, Daniel Peck, Michal Wrobel, Gennady MishurisOne of the assumptions of Linear Elastic Fracture Mechanics is that the crack faces are tractionfree or, at most, loaded by bounded tractions. The standard Irwin’s crack closure integral, widely used for the computation of the Energy Release Rate, also relies upon this assumption. However, there are practical situations where the load acting on the crack boundaries is singular. This is the case, for

Effective thermal conductivity of particulate composites for timevarying temperature fields Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210524
S. Kanaun, V. LevinA homogeneous conductive medium containing random sets of identical spherical inclusions is considered. The selfconsistent effective medium method is used for solution of the homogenization problem and calculation of the effective thermal conductivity parameters of the composite. For timevarying fields, the effective conductivity parameters are nonlocal operators with respect to time. The effective

Curvature tunes wrinkling in shells Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210522
Ting Wang, Fei Liu, Chenbo Fu, Xiaoliang Zhang, Kui Wang, Fan XuTransverse wrinkles usually emerge in a uniaxially stretched elastic film and can be suppressed upon further tension, which is an instabilityrestabilization behavior due to the nonlinear competition between stretching energy and bending energy. Here, we show that curvature can effectively and precisely tune the wrinkling localization and amplitude. To quantitatively explore curvature effect on the

On the central role of the invariant I2 in nonlinear elasticity Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210511
Afshin AnssariBenam, Andrea Bucchi, Giuseppe SaccomandiThe necessity of the inclusion of the second invariant of the left CauchyGreen deformation tensor B, namely I2, in the strain energy function W of rubberlike materials is analysed. Universal relationships that underline such necessity are revisited, and experimental data are examined to establish the trends in the variation of ∂W/∂I2. Corroborated by the established experimental trends, we consider

Mechanics of a pressurized pennyshaped crack in a poroelastic halfspace Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210421
A.P.S. Selvadurai, P. SameaThis paper examines the axisymmetric problem of a pennyshaped crack located in a poroelastic halfspace that is modelled by Biot poroelasticity. The paper first examines the axisymmetric problem of the mechanics of fluid injection over a circular area within a halfspace that would create the skeletal stress state necessary to initiate fracture. The triggering of the fracture is assumed to create an

Instability of compressible soft electroactive plates Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210402
Guozhan Xia, Yipin Su, Weiqiu ChenIn this paper, we investigate the formation of twodimensional surface wrinkles in a predeformed compressible soft electroactive (SEA) plate. Two common electrical loading protocols are considered: one is the socalled voltagecontrol where the plate is applied with a constant voltage across the thickness; the other is named as chargecontrol where the plate is activated by uniformly spraying electrical

On the macroscopic strength criterion of ductile nanoporous materials Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210329
Chenyi Zheng, Changwen MiThis work investigates the void surface effects on the macroscopic yield criterion of ductile materials embedded with nanosized spherical cavities. The solid matrix is treated as an isotropic, von Mises, incompressible and rigidperfectly plastic material. Based on the trial velocity field proposed by Gurson and the firstorder Taylor approximations of the equivalent volume strain rate, surface strain

A hierarchical scheme from nano to macro scale for the strength and ductility of graphene/metal nanocomposites Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210326
Xiaodong Xia, Zijian Du, Juanjuan Zhang, Jianjun Li, George J. WengRecent experiments have shown that grain size of metals in graphene/metal nanocomposites has a significant effect on their strength and ductility. As the grain size decreases, the strength tends to increase while the ductility tends to decrease. But quantitative assessment of these observations remains a challenge. In this paper, we establish a hierarchical scheme from nano to macro scale to evaluate

Conductivity and elastic stiffness of spherical particle composite with partially disordered microstructure Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210323
Volodymyr I. Kushch, Igor SevostianovThe spherical particle composite with the microstructure varying from perfectly ordered to completely disordered is considered. The partially disordered periodic packings of spheres are generated in the framework of the reprehensive unit cell model with aid of the Metropolis algorithm. The orientation order invariants Qi introduced by Steinhardt et al. [Phys. Rev. B 28 (1983) 784] in the molecular

Quasiadiabatic approximation for thermoelastic surface waves in orthorhombic solids Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210216
A. Nobili, A.V. PichuginAn asymptotic model for timeharmonic motion in fullycoupled linear thermoelastic orthorhombic materials is presented. The asymptotic approach takes advantage of the observation that the parameter expressing departure from the purely adiabatic regime is extremely small in practice. Consequently, the leading order bulk response turns out to be nondissipative, and is governed by the usual equations

On the mechanics of microshells of revolution Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210215
Amir Mehdi DehrouyehSemnani, Hasan MostafaeiIn the current investigation, a novel mathematical formulation is established for the sizedependent thin doubly curved microshells of revolution with arbitrary meridian curve based on the modified couple stress theory and the KirchhoffLove's hypothesis. The impact of sizedependency on both the governing equations and reduced boundary conditions is taken into account. Afterwards, based on the weak

Processing of viscoelastic data via a generalized fractional model Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210212
Xianglong Su, Donggang Yao, Wenxiang XuData fitting and interconversion remain to be a difficult task in linear viscoelasticity. On the basis of transfer function, a generalized fractional model is proposed to fit linear viscoelastic data. The new model is modified from the fractional Maxwell model, and it is abbreviated as the MFM model in this paper. Common fractional viscoelastic models, including the fractional Kelvin and fractional

Multiscale modeling framework to predict the effective stiffness of a crystallinematrix nanocomposite Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210209
Sangryun Lee, Jiyoung Jung, Youngsoo Kim, Yongtae Kim, Seunghwa RyuRecently, multiscale modeling frameworks combining micromechanicsbased homogenization methods and atomistic simulations have been widely applied to predict the effective stiffness of particulatereinforced composites. Although most studies demonstrated that theoretical predictions incorporating interfacial damage are necessary to explain atomistic simulation results, the microscopic origin of the

Thermal conductivity and elastic modulus of 3D porous/fractured media considering percolation Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210127
Wenxiang Xu, Yufeng Zhang, Jinyang Jiang, Zhiyong Liu, Yang JiaoPores, vugs, and cracks configurations affect physical and mechanical properties of porous and fractured (PF) media, specifically the percolations of pores/vugs/cracks trigger the dramatic change of conductivelike properties such as thermal conductivity, diffusivity, elastic modulus of PF media. It has been a key but unresolved issue how to accurately capture the percolation thresholds of these complex

Micromechanical modeling of a cracked elliptically orthotropic medium Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210118
J.F. Barthélémy, I. Sevostianov, A. GiraudIn this paper, we derive the secondorder crack opening displacement tensor for an arbitrarily oriented elliptical crack in an elliptically orthotropic (EO) matrix. This result is obtained in explicit closed form. The approach is based on the SaintVenant’s idea of linear transformation between boundary value problems for elliptically orthotropic and isotropic bodies. The solution utilizes the classical

On the strength of nanoporous materials with the account of surface effects Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210114
Chenyi Zheng, Gongye Zhang, Changwen MiThe increasing applications of nanoporous materials in engineering structures call for robust strength criteria that are able to model the size effects of multiscale voids inherent to these materials. Many literature works have devoted to this line of research by either employing the classical homogenization approach or extending Gurson’s model to incorporate the nanovoid surface mechanics. However

Timedependent behavior of porous curved nanobeam Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210109
Xianzhen Xu, Behrouz Karami, Davood ShahsavariThis work provides a comparative analysis of the effect of nanovoids distribution associated with trigonometric functions on forced mechanical characteristics of functionally graded curved nanobeams. A geometrically exact model is developed for the simplysupported beam utilizing a higherorder beam theory including thickness stretching effect. In order to capture the smallscale effects, the governing

A dualrole theory of the aspect ratio of the nanofillers for the thermal conductivity of graphenepolymer nanocomposites Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210104
Chao Li, Jie Wang, Yu SuThe extremely low thicknesstolength ratio (aspect ratio) of graphene nanofillers has long been considered beneficial to the overall thermal conductivity of graphenepolymer nanocomposites as it creates large surface area and extra channels for phonon transport. From time to time, however, a lower aspect ratio of the nanofillers did not yield a higher thermal conductivity as expected. To explain such

A new permeability model for argillaceous porous media under stress dependence with clay swelling Int. J. Eng. Sci. (IF 8.843) Pub Date : 20210104
Gang Lei, Qinzhuo Liao, Shirish Patil, Yang ZhaoThis paper derives a novel analytical model for stress dependent permeability of argillaceous porous media (APM) considering clay swelling using fractal theory. The model shows that the stress dependent permeability is a function of effective stress, clay content, clay expansion coefficient, initial irreducible water saturation and rock lithology. It is validated by the available test data from experimental

On the dynamics of nanoframes Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201223
Andrea Francesco Russillo, Giuseppe Failla, Gioacchino Alotta, Francesco Marotti de Sciarra, Raffaele BarrettaSizedependent dynamic responses of smallsize frames are modelled by stressdriven nonlocal elasticity and assessed by a consistent finiteelement methodology. Starting from uncoupled axial and bending differential equations, the exact dynamic stiffness matrix of a twonode stressdriven nonlocal beam element is evaluated in a closed form. The relevant global dynamic stiffness matrix of an arbitrarilyshaped

Identification of nonlocal continua for latticelike materials Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201211
Andrea Bacigalupo, Luigi GambarottaThe paper is focused on the dynamic homogenization of latticelike materials with lumped mass at the nodes to obtain energetically consistent models providing accurate descriptions of the acoustic behavior of the discrete system. The equation of motion of the Lagrangian onedimensional lattice is transformed according to a unitary approach aimed to identify equivalent nonlocal continuum models of

A thermodynamic framework for additive manufacturing, using amorphous polymers, capable of predicting residual stress, warpage and shrinkage Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201210
P Sreejith, K Kannan, KR RajagopalA thermodynamic framework has been developed for a class of amorphous polymers used in fused deposition modeling (FDM), in order to predict the residual stresses and the accompanying distortion of the geometry of the printed part (warping). When a polymeric melt is cooled, the inhomogeneous distribution of temperature causes spatially varying volumetric shrinkage resulting in the generation of residual

Mathematical formulations for elastic magnetoelectrically coupled soft materials at finite strains: Timeindependent processes Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201206
R. Bustamante, M.H.B.M. Shariff, M. HossainRecently, among other smart and multifunctional materials, magnetoelectric soft materials are expected to open a new horizon with myriad of potential applications such as wireless energy harvesting, spintronics and nonvolatile memories, magnetoelectric random access memory, to mention a few. Magnetoelectric coupling can be defined as the ability of a material to electrically polarize upon the application

Necking of a hyperelastic solid cylinder under axial stretching: Evaluation of the infinitelength approximation Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201203
Mi Wang, Yibin FuA weakly nonlinear analysis is conducted for localized necking of a hyperelastic solid cylinder under axial stretching based on the exact theory of nonlinear elasticity. The amplitude equation derived is shown to be consistent with the onedimensional model recently proposed by Audoly and Hutchinson (J. Mech. Phys. Solids 97, 2016, 68–91). It is shown that results based on the infinitelength approximation

Threedimensional fields in an infinite transversely isotropic magnetoelectroelastic space with multiple coplanar pennyshaped cracks Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201203
TaiHong Wu, XiangYu Li, HuaiPing TangThis paper investigates the ModeI crack problem that a threedimensional infinite space of transversely isotropic multiferroic composite medium is weakened by multiple coplanar pennyshaped cracks under uniform mechanical, electric and magnetic loadings. These cracks are arbitrarily distributed in an isotropic plane of the material. Four kinds of idealized electromagnetic crack boundary conditions

Mechanical and thermal properties of stainless steel parts, manufactured by various technologies, in relation to their microstructure Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201126
Sulaymon Eshkabilov, Ismat Ara, Igor Sevostianov, Fardad Azarmi, Xiangping TangpongThis work provides comparative analysis of the effect of manufacturing processes and process parameters on mechanical and thermal properties of stainless steel 316L. The properties are compared for the parts produced by additive manufacturing (Selected Laser Melting), thermal spraying, casting, hot/cold rolling, hotisostatic pressing, and forging technologies. Each of these manufacturing processes

On the influence of a surface roughness on propagation of antiplane shortlength localized waves in a medium with surface coating Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201121
Gennadi I. Mikhasev, Marina G. Botogova, Victor A. EremeyevWe discuss the propagation of localized surface waves in the framework of the linear Gurtin–Murdoch surface elasticity and taking into account a roughness of a free boundary. We derive a boundaryvalue problem for antiplane motions with curvilinear boundary and surface stresses. Using the asymptotic technique developed earlier, we obtain the form of a localized wave and analyze its amplitude evolution

On the dynamics of nanoshells Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201121
Xianzhen Xu, Behrouz Karami, Maziar JanghorbanThe resonance phenomenon is for the first time investigated in anisotropic and functionally graded anisotropic nanosize structure. The structure is considered as a doubly curved shell which is modeled exploiting a quasithreedimensional model and nonlocal strain gradient theory in order to predict the smallsize effects. The doublycurved nanoshell is made from aragonite with an orthorhombic crystal

The ductile/brittle transition, is it well posed and determinable Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201119
Richard M. ChristensenIt is developed and derived that the ductile/brittle transition is located at ν*=2/3 where ν*is the renormalized form of the standard Poisson's ratio. This is for homogeneous and isotropic materials in the state of uniaxial tension. This then converts to the ductile/brittle transition as being established at μ/k =1/2 where μ and k are the shear and bulk moduli. The consequences of these results for

Thermoelasticity of multilayered plates with imperfect interfaces Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201117
A. Vattré, E. PanThreedimensional exact solutions for temperature and thermoelastic stresses in multilayered anisotropic plates are derived for advanced boundaryvalue problems with general boundary conditions. The extended Stroh formalism is formulated to include the thermal coupling with the Eringen nonlocal elasticity theory that captures small scale effects. The simply supported structures are subjected to timeharmonic

An exact closedform solution of threedimensional transient Green's functions in a constrained transversely isotropic halfspace Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201117
Mehdi RaoofianNaeeni, Morteza EskandariGhadi, Ernian PanIn this paper, we derive an exact closedform solution of threedimensional transient Green's functions (GFs) at the free surface of a constrained transversely isotropic (TI) halfspace due to an arbitrarily oriented surface point force of Heaviside time variation. The solution clearly delineates the distinct features of body waves (P, SV and SH waves) as well as Rayleigh surface wave in displacement

On the influence of fluid rheology on hydraulic fracture Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201117
Michal Wrobel, Gennady Mishuris, Panos PapanastasiouWe analyse a problem of a hydraulic fracture driven by a nonNewtonian shearthinning fluid. Fluid viscosity is described by the fourparameter truncated powerlaw model. By varying the parameters of the rheological model we investigate spatial and temporal evolution of fluid flow inside the crack and the resulting fracture geometry. A detailed quantitative and qualitative analysis of the underlying

Local fields and effective conductivity of composites with anisotropic components Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201116
S. KanaunA homogeneous anisotropic conductive medium with a set of anisotropic heterogeneities of arbitrary shapes is considered. Calculation of local fields in the medium subjected to arbitrary external fields is reduced to systems of volume integral equations. For numerical solution, these equations are discretized using Gaussian approximating functions concentrated at the nodes of a regular grid. The elements

Vibration analysis of scaledependent thin shallow microshells with arbitrary planform and boundary conditions Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201113
Amir Mehdi DehrouyehSemnani, Hasan MostafaeiThe current article presents a thorough investigation into the natural frequencies and mode shapes of thin doubly curved shallow microshells by taking into account the influence of material length scale parameter. The mathematical model of system is obtained by applying the Hamilton's principle along with the modified couple stress theory and the KirchhoffLove's shell theory. In order to extract the

A new methodology for evaluation of thermal or electrical conductivity of the skeleton of a porous material Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201111
Dariusz Łydżba, Adrian Różański, Igor Sevostianov, Damian StefaniukA new methodology of the evaluation of the thermal/electrical properties of the skeleton of a porous material from measurements of the overall properties of this material saturated with various conductive fluids is proposed and numerically verified. The approach is based on the concept of equivalent microstructure and solution of the inverse homogenization problem in the framework of MoriTanakaBenveniste

A nonlocal elastica inspired by flexural tensegrity Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201106
Claudio Boni, Gianni RoyerCarfagniA nonlocal theory is presented for the bending in large deformations under applied loads of an initially straight rod. This has similarities with the classical Euler’s elastica in the sense that the bending stiffness remains homogeneously constant, but it depends on an integral average of the entire curvature field. The discretized form of the equilibrium equations is identical to those governing the

Uncovering the glasstransition temperature and temperaturedependent storage modulus of graphenepolymer nanocomposites through irreversible thermodynamic processes Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201103
Xiaodong Xia, Jackie Li, Juanjuan Zhang, George J. WengSeveral recent experiments have shown that the glasstransition temperature and temperaturedependent storage modulus of graphenepolymer nanocomposites are dependent on the graphene loading, but at present no theory exists to explain these observations. In this paper, we take the view that both issues are closely tied to the principle of irreversible thermodynamics, and that, by considering the phase

A variational approach of homogenization of piezoelectric composites towards piezoelectric and flexoelectric effective media Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201104
Nagham Mawassy, Hilal Reda, JeanFrancois Ganghoffer, Victor A. Eremeyev, Hassan LakissThe effective piezoelectric properties of heterogeneous materials are evaluated in the context of periodic homogenization, whereby a variational formulation is developed, articulated with the extended Hill macrohomogeneity condition. The entire set of homogenized piezoelectric moduli is obtained as the volumetric averages of the microscopic properties of the individual constituents weighted by the

On the shell model for human eye in Glaucoma disease Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201101
Shahriar Dastjerdi, Bekir Akgöz, Ömer CivalekA new mechanical and analytical models of the human eye is presented in order to study Glaucoma disease and its complications. Mechanical modeling of the human eye is performed with a hollow sphere under internal pressure. The firstorder shear deformation theory is used to obtain the governing equations of the model, which are the set of partial differential equations. The nonlinear von Kármán assumption

Microscopic and longwave instabilities in 3D fiber composites with nonGaussian hyperelastic phases Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201022
Nitesh Arora, Jian Li, Viacheslav Slesarenko, Stephan RudykhWe investigate the microscopic and longwave (or macroscopic) instabilities in fiber composites (FCs) with hyperelastic phases. To study the influence of the phase stiffening behavior, we employ the phase constitutive models that are developed based on the nonGaussian statistics of polymeric molecular chains. These nonGaussian models accurately predict the nonlinear behavior of soft materials. Moreover

A novel approach to quantitative predictions of highfrequency coupled vibrations in layered piezoelectric plates Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201015
Zinan Zhao, Bin Wang, Zhenghua Qian, YookKong YongThe thicknessextensional mode in layered piezoelectric plates can be inevitably interfered by some undesirable eigenmodes due to the lateral edge effect. A reported theoretical method to predict highfrequency coupled vibrations is the 2D highorder plate theory derived based on approximate dispersion relations. In this paper, based on accurate dispersion relations a novel approach called Frequency

On the mechanics of composite sandwich plates with threedimensional stress recovery Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201017
SuBin Lee, ChangYong Lee, Dewey H. HodgesBy using the variationalasymptotic method, a universal asymptotic model for composite sandwich plates is established to achieve a great compromise between efficiency and accuracy through the synthesis of two competing theories: equivalent singlelayer theories and layerwise theories. When each layer of a sandwich structure can be individually considered as an elastic plate, and all material constitutive

Modeling Payne effect with a framework of multiple natural configurations Int. J. Eng. Sci. (IF 8.843) Pub Date : 20201015
S.P. Atul Narayan, Liviu Iulian PaladePayne effect is the complex nonlinear response of filled elastomers to oscillatory loading. Although usually characterized by the decrease in the storage modulus with strain amplitude, and by the bellshaped curve of loss modulus with strain amplitude, the response has many other peculiar features. The manner of decrease in storage modulus with strain amplitude does not change when the frequency of