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Habib Hebali,Ahmed Bakora,Abdelouahed Tounsi,Abdelhakim Kaci 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.3
This work presents a bending, buckling, and vibration analysis of functionally graded plates by employing a novel higher-order shear deformation theory (HSDT). This theory has only four unknowns, which is even less than the first shear deformation theory (FSDT). A shear correction coefficient is, thus, not needed. Unlike the conventional HSDT, the present one has a new displacement field which introduces undetermined integral variables. Equations of motion are obtained by utilizing the Hamilton's principles and solved via Navier's procedure. The convergence and the validation of the proposed theoretical numerical model are performed to demonstrate the efficacy of the model.
Performance Analysis of GaN/AlGaN/AlN/GaN MIS-MODFETs with High-κ as Gate Dielectric Insulator Layer
Khaled Hebali,Driss Bouguenna,Abbès Beloufa,Sajad Ahmad Loan 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.3
In this work, the impact of high-κ permittivity gate dielectric materials on electrical performance of GaN MODFETs has been studied by using Matlab and Atlas-TCAD. A rigorous comparative analysis of the proposed ZrO2 oxide based GaN MIS-MODFETs with Conv. MODFETs and HfO 2 based MIS-MODFETs have been performed. A two dimensional (2D) calibrated simulation studies have shown that the use ZrO2 based MIS-MODFETs significantly outperforms the Conv. MODFETs and HfO2 based MIS-MODFETs in most of the performance measuring parameters. Thus, excellent dielectric for insulator materials properties such as high-κ permittivity and higher output device performance is investigated. The simulation results indicated that the use of ZrO2 high-κ as gate dielectric material could improve the output performance in terms of drain current and the calibrated simulation results are affirmed with those of the experience existing in the literature and shown that the use ZrO2 could improve also the interfacial quality and ensure high thermal stability of the gate dielectric layer in Conv. MODFETs for efficient power switching applications.
Moussa Bellal,Habib Hebali,Houari Heireche,Abdelmoumen Anis Bousahla,Abdeldjebbar Tounsi,Fouad Bourada,S.R. Mahmoud,E.A. Adda Bedia,Abdelouahed Tounsi 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.5
In the present work, the buckling behavior of a single-layered graphene sheet (SLGS) embedded in visco-Pasternak’s medium is studied using nonlocal four-unknown integral model. This model has a displacement field with integral terms which includes the effect of transverse shear deformation without using shear correction factors. The visco-Pasternak’s medium is introduced by considering the damping effect to the classical foundation model which modeled by the linear Winkler’s coefficient and Pasternak’s (shear) foundation coefficient. The SLGS under consideration is subjected to compressive in- plane edge loads per unit length. The influences of many parameters such as nonlocal parameter, geometric ratio, the visco-Pasternak’s coefficients, damping parameter, and mode numbers on the buckling response of the SLGSs are studied and discussed.
Fatima Zohra Djidar,Habib Hebali,Khaled Amara,Abdelouahed Tounsi,Boudjema Bendaho,M.H. Ghazwani,Muzamal Hussain 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.6
This work presents a simple exponential shear deformation theory for the flexural and free vibration responses of thick bridge deck. Contrary to the existing higher order shear deformation theories (HSDT) and the first shear deformation theory (FSDT), the proposed model uses a new displacement field which incorporates undetermined integral terms and involves only two variables. Governing equations and boundary conditions of the theory are derived by the principle of virtual work. The simply supported thick isotropic square and rectangular plates are considered for the detailed numerical studies. Results of displacements, stresses and frequencies are compared with those of other refined theories and exact theory to show the efficiency of the proposed theory. Good agreement is achieved of the present results with those of higher order shear deformation theory (HSDT) and elasticity theory. Moreover, results demonstrate that the developed two variable refined plate theory is simple for solving the flexural and free vibration responses of thick bridge deck and can achieve the same accuracy of the existing HSDTs which have more number of variables.
Fahsi, Asmaa,Tounsi, Abdelouahed,Hebali, Habib,Chikh, Abdelbaki,Adda Bedia, E.A.,Mahmoud, S.R. Techno-Press 2017 Geomechanics & engineering Vol.13 No.3
This work presents a simple and refined nth-order shear deformation theory for mechanical and thermal buckling behaviors of functionally graded (FG) plates resting on elastic foundation. The proposed refined nth-order shear deformation theory has a new displacement field which includes undetermined integral terms and contains only four unknowns. Governing equations are obtained from the principle of minimum total potential energy. A Navier type analytical solution methodology is also presented for simply supported FG plates resting on elastic foundation which predicts accurate solution. The accuracy of the present model is checked by comparing the computed results with those obtained by classical plate theory (CPT), first-order shear deformation theory (FSDT) and higher-order shear deformation theory (HSDT). Moreover, results demonstrate that the proposed theory can achieve the same accuracy of the existing HSDTs which have more number of variables.
Moussa Abualnour,Abdelbaki Chikh,Habib Hebali,Abdelhakim Kaci,Abdeldjebbar Tounsi,Abdelmoumen Anis Bousahla,Abdelouahed Tounsi 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.6
The thermo-mechanical bending behavior of the antisymmetric cross-ply laminates is examined using a new simple four variable trigonometric plate theory. The proposed theory utilizes a novel displacement field which introduces undetermined integral terms and needs only four variables. The validity of the present model is proved by comparison with solutions available in the literature.
Thermal buckling analysis of cross-ply laminated plates using a simplified HSDT
Abdelbaki Chikh,Abdelouahed Tounsi,Habib Hebali,S. R. Mahmoud 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.3
This work presents a simplified higher order shear deformation theory (HSDT) for thermal buckling analysis of cross-ply laminated composite plates. Unlike the existing HSDT, the present one has a new displacement field which introduces undetermined integral terms and contains only four unknowns. Governing equations are derived from the principle of the minimum total potential energy. The validity of the proposed theory is evaluated by comparing the obtained results with their counterparts reported in literature. It can be concluded that the proposed HSDT is accurate and simple in solving the thermal buckling behavior of laminated composite plates.