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Ellali, Mokhtar,Amara, Khaled,Bouazza, Mokhtar,Bourada, Fouad Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.1
In this article, an exact analytical solution for mechanical buckling analysis of magnetoelectroelastic plate resting on pasternak foundation is investigated based on the third-order shear deformation plate theory. The in-plane electric and magnetic fields can be ignored for plates. According to Maxwell equation and magnetoelectric boundary condition, the variation of electric and magnetic potentials along the thickness direction of the plate is determined. The von Karman model is exploited to capture the effect of nonlinearity. Navier's approach has been used to solve the governing equations for all edges simply supported boundary conditions. Numerical results reveal the effects of (i) lateral load, (ii) electric load, (iii) magnetic load and (iv) higher order shear deformation theory on the critical buckling load have been investigated. These results must be the analysis of intelligent structures constructed from magnetoelectroelastic materials.
Mokhtar Ellali,Khaled Amara,Mokhtar Bouazza,Fouad Bourada 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.21 No.1
In this article, an exact analytical solution for mechanical buckling analysis of magnetoelectroelastic plate resting on pasternak foundation is investigated based on the third-order shear deformation plate theory. The in-plane electric and magnetic fields can be ignored for plates. According to Maxwell equation and magnetoelectric boundary condition, the variation of electric and magnetic potentials along the thickness direction of the plate is determined. The von Karman model is exploited to capture the effect of nonlinearity. Navier\'s approach has been used to solve the governing equations for all edges simply supported boundary conditions. Numerical results reveal the effects of (i) lateral load, (ii) electric load, (iii) magnetic load and (iv) higher order shear deformation theory on the critical buckling load have been investigated. These results must be the analysis of intelligent structures constructed from magnetoelectroelastic materials.
Thermal buckling of porous FGM plate integrated surface-bonded piezoelectric
Mokhtar Ellali,Khaled Amara,Mokhtar Bouazza Techno-Press 2024 Coupled systems mechanics Vol.13 No.2
In the present paper, thermal buckling characteristics of functionally graded rectangular plates made of porous material that are integrated with surface-bonded piezoelectric actuators subjected to the combined action of thermal load and constant applied actuator voltage are investigated by utilizing a Navier solution method. The uniform temperature rise loading is considered. Thermomechanical material properties of FGM plates are assumed to be temperature independent and supposed to vary through thickness direction of the constituents according to power-law distribution (P-FGM) which is modified to approximate the porous material properties with even and uneven distributions of porosities phases. The governing differential equations of stability for the piezoelectric FGM plate are derived based on higher order shear deformation plate theory. Influences of several important parameters on the critical thermal buckling temperature are investigated and discussed in detail.
Mokhtar Ellali,Mashhour A. Alazwari,Mokhtar Bouazza,Mohamed A. Eltaher,Noureddine Benseddiq Techno-Press 2024 Coupled systems mechanics Vol.13 No.4
The objective of this work is to study the effects of the modification of material properties on the vibration of the FGM beam using an integral shear strain model. In the present theory, the rotational displacement is replaced by an integral term in the displacement fields. The use of a shear correction factor is not necessary because our model gives a parabolic description of shear stress through the thickness while satisfying the conditions of zero shear stresses on the bottom and top surfaces of the beam. The FGM beam is assumed that the beam is a mixture of metal and ceramic, and that its properties change depending on the power functions of the thickness of the beam such as: linear, quadratic, cubic and inverse quadratic. By applying Hamilton's principle, general formulas were obtained to obtain the frequencies of the FGM beam. The effects of changing compositional characteristics of materials presented by volume fraction of FGM beams with simply supported edges on free vibration and some mode shapes are investigated.
Kamel Antar,Khaled Amara,Samir Benyoucef,Mokhtar Bouazza,Mokhtar Ellali 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.3
The purpose of this paper is to investigate the hygrothermal effects on the behavior of reinforced-concrete beams strengthened by bonded composite laminate plates (n/90 m)s. This work is based on a simple theoretical model to estimate the interfacial stresses developed between the concrete beam and the composite with taking into account the hygrothermal effect. Fibre orientation angle effects of number of 90° layers and effects of plate thickness and length on the distributions of interfacial stress in the concrete beams reinforced with composite plates have also been studied.
Belaid Kumar Djamal,Elhorri Abdelkader M.,Mered Yassine,Hichem Ellali 한국공업화학회 2022 공업화학 Vol.33 No.4
The oxidative degradation performance of the Erionyl Navy R dye was studied in this article. The investigation mainly focused on a comparative study between chemical oxidations by sodium hypochlorite (NaClO) and hydrogen peroxide (H2O2), and catalytic oxidations including the Fenton (Fe2+-H2O2) and Fenton-Like (Fe2+/ Fe3+/Co2+/ Mn2+-H2O2) or modified Fenton-like (Fe2+/ Fe3+ -NaClO) reactions. A discoloration and degradation of the Erionyl Navy R occurred after 30 minutes, which varies according to the oxidation system involved; 31%, 54%, <20%, 95%, and >96% losses were observed for Co2+-H2O2, Mn2+-H2O2, Fe2+-NaClO, Fe3+-NaClO), and Fe2+-H2O2 and Fe3+-H2O2, respectively.