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Farouk Yahia Addou1,Mustapha Meradjah,Abdelmoumen Anis Bousahla,Abdelkader Benachour,Fouad Bourada,Abdelouahed Tounsi,S.R. Mahmoud 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.4
This work investigates the effect of Winkler/Pasternak/Kerr foundation and porosity on dynamic behavior of FG plates using a simple quasi-3D hyperbolic theory. Four different patterns of porosity variations are considered in this study. The used quasi-3D hyperbolic theory is simple and easy to apply because it considers only four-unknown variables to determine the four coupled vibration responses (axial-shear-flexion-stretching). A detailed parametric study is established to evaluate the influences of gradient index, porosity parameter, stiffness of foundation parameters, mode numbers, and geometry on the natural frequencies of imperfect FG plates.
Liani, Mohamed,Moulay, Noureddine,Bourada, Fouad,Addou, Farouk Yahia,Bourada, Mohamed,Tounsi, Abdelouahed,Hussain, Muzamal Techno-Press 2022 Advances in materials research Vol.11 No.1
In this paper, the nonlocal integral Timoshenko beam model is employed to study the free vibration characteristics of singled walled carbon nanotubes (SWCNTs) including the thermal effect. Based on the nonlocal continuum theory, the governing equations of motion are formulated by considering thermal effect. The influences of small scale parameter, the chirality of SWCNTs, the vibrational mode number, the aspect ratio of SWCNTs and temperature changes on the thermal vibration properties of single-walled nanotubes are examined and discussed. Results indicate significant dependence of natural frequencies on the nonlocal parameter, the temperature change, the aspect ratio and the chirality of SWCNTs. This work should be useful reference for the application and the design of nanoelectronics and nanoelectromechanical devices that make use of the thermal vibration properties of SWCNTs.
A simple analytical model for free vibration and buckling analysis of orthotropic rectangular plates
Souad Sellam,Kada Draiche,Youcef Tlidji,Farouk Yahia Addou,Abdelkader Benachour 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.2
In the present paper, a simple analytical model is developed based on a new refined parabolic shear deformation theory (RPSDT) for free vibration and buckling analysis of orthotropic rectangular plates with simply supported boundary conditions. The displacement field is simpler than those of other higher-order theories since it is modeled with only two unknowns and accounts for a parabolic distribution of the transverse shear stress through the plate thickness. The governing differential equations related to the present theory are obtained from the principle of virtual work, while the solution of the eigenvalue problem is achieved by assuming a Navier technique in the form of a double trigonometric series that satisfy the edge boundary conditions of the plate. Numerical results are presented and compared with previously published results for orthotropic rectangular plates in order to verify the precision of the proposed analytical model and to assess the impacts of several parameters such as the modulus ratio, the side-to-thickness ratio and the geometric ratio on natural frequencies and critical buckling loads. From these results, it can be concluded that the present computations are in excellent agreement with the other higher-order theories.
Bending behaviour of FGM plates via a simple quasi-3D and 2D shear deformation theories
Youcef, Ali,Bourada, Mohamed,Draiche, Kada,Boucham, Belhadj,Bourada, Fouad,Addou, Farouk Yahia Techno-Press 2020 Coupled systems mechanics Vol.9 No.3
This article investigates the static behaviour of functionally graded (FG) plates sometimes declared as advanced composite plates by using a simple and accurate quasi-3D and 2D hyperbolic higher-order shear deformation theories. The properties of functionally graded materials (FGMs) are assumed to vary continuously through the thickness direction according to exponential law distribution (E-FGM). The kinematics of the present theories is modeled with an undetermined integral component and satisfies the free transverse shear stress conditions on the top and bottom surfaces of the plate; therefore, it does not require the shear correction factor. The fundamental governing differential equations and boundary conditions of exponentially graded plates are derived by employing the static version of principle of virtual work. Analytical solutions for bending of EG plates subjected to sinusoidal distributed load are obtained for simply supported boundary conditions using Navier'is solution procedure developed in the double Fourier trigonometric series. The results for the displacements and stresses of geometrically different EG plates are presented and compared with 3D exact solution and with other quasi-3D and 2D higher-order shear deformation theories to verify the accuracy of the present theory.
Effect of V-doping on electrochemical properties of Gd2O3 thin layers
Rossi Zaid,Ghannam Hajar,Brioual Bilal,El-Habib Abdellatif,Aouni Abdesamad,Diani Mustapha,Addou Mohammed 한국물리학회 2022 Current Applied Physics Vol.44 No.-
Undoped and Vanadium doped Gadolinium oxide (x = 2,4,6 at%) thin layers were successfully elaborated on glass substrates using spray pyrolysis technique at an optimized temperature (500◦C). The physicochemical characterization of elaborated layers was carried out using X-ray diffractometer, resulting in polycrystalline monoclinic B-type structure for all undoped and Gd2O3:V layers. Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy, showed that Gd2O3:V (2 at%) has the roughest surface with an RMS of 26.62 nm and confirmed the presence of all whished elements (Gd, O and V). Finally, the electrochemical properties were investigated by cyclic voltammetry analysis and Electrochemical Impedance Spectroscopy which revealed that vanadium improves the electrochemical performance of Gd2O3 thin layers. Notably, the surface roughness and vanadium low doping concentration (2 at%) lead to a synergy effect in the specific capacitance (208.51 μF/cm2). Hence, the electrode Gd2O3:V (2 at%) proves to be an auspicious enhancement to the electrochemical performance of the supercapacitors based on Gd2O3.
Zimou J.,Nouneh K.,Talbi A.,El Gana L.,Hsissou R.,El Habib A.,Ahmoum H.,Briche S.,El Jouad Z.,Beraich M.,Addou M. 한국물리학회 2021 Current Applied Physics Vol.31 No.-
Undoped and Ni-doped thin films of cerium dioxide have been deposited by spray pyrolysis technique on the glass substrate at the optimized temperature (450 ± 5) ◦C. Thin films Ce1-xNixO2 doped by different concentrations of Ni was characterized by X-ray diffraction. Raman analysis showed a peak at 461 ± 1 cm 1 position for the undoped film, which corresponds to the active mode (F2g mode) of the cubic fluorite structure. SEM images showed that the particles have a uniform spherical shape. EDS data have confirmed all elements (Ce, Ni and O) existence. Optical properties of samples show a decrease in band gap energy with increasing the nickel rate. Cyclic voltammetry indicates that the storage capacity of samples increases as the Ni rate increases. The EIS of CeO2/ITO electrodes displays a small semicircular at high frequency. The theoretical results obtained using WIEN2k match well with the experimental ones.