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A dual-phase-lag theory of thermal wave in a porothermoelastic nanoscale material by FEM
Tareq Saeed,Ibrahim Abbas 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.1
In the current article, the dual phase lag theory is used to discussed the waves propagations in poroelastic nanoscale materials by the finite element method. Using the FEM to get the solutions of the complex formulation of the problem numerically. The numerical accuracy is further improved by the implementation of quadratic interpolation functions. The impacts of the thermal delay time and the porosity in a porothermal and elastic mediums are studied. The numerical outcomes for the components of displacement, the temperatures and the components of stress for the solid and liquid are represented graphically. Three theories of thermoelasticity viz. the Classical dynamical coupled (CT), Lord and Shulman (LS), and dualphase- lag (DPL) thermoelasticity theories are considered in this problem. the present analysis may have significant application and contribution in areas utilizing the non-simples porothermoelastic with various phases in details.
Tareq Saeed,Ibrahim Abbas 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.4
A mathematical model of Lord-Shulman photo-thermal theorem induced by pulse heat flux is presented to study the propagations waves for plasma, thermal and elastic in two-dimensional semiconductor materials. The medium is assumed initially quiescent. By using Laplace-Fourier transforms with the eigenvalue method, the variables are obtained analytically. A semiconductor medium such as silicon is investigated. The displacements, stresses, the carrier density and temperature distributions are calculated numerically and clarified graphically. The outcomes show that thermal relaxation time has varying degrees of effects on the studying fields.
M. Syed Ali,R. Agalya,Sumit Saroha,Tareq Saeed 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.7
This paper inspects the consensus problem of nonlinear mixed delay multi-agent systems with random packet losses through the sampled-data control using the undirected graph without any specified leader for the other following agents. The probabilistic time varying delay is taken in the control input delay that Bernoulli distributed white sequence is engaged to formulate the random packet losses between the agents. The consensus problem can be changed over into a stabilization problem by using the Laplacian matrix which can be obtained by undirected graph. By framing a Lyapunov-Krasovskii functional with triple integral terms and implementation of the property of Kronecker product together with some well known matrix inequality techniques, a mean square consensus for mixed delay multi-agent system can be achieved. Terminally, two numerical examples are provided to illuminate the advantages of the suggested techniques.
A novel refined shear deformation theory for the buckling analysis of thick isotropic plates
M. Fellah,Kada Draiche,Mohammed Sid Ahmed Houari,Abdelouahed Tounsi,Tareq Saeed,Mohammed Sh Alhodaly,Mohamed Benguediab 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.3
In present study, a novel refined hyperbolic shear deformation theory is proposed for the buckling analysis of thick isotropic plates. The new displacement field is constructed with only two unknowns, as against three or more in other higher order shear deformation theories. However, the hyperbolic sine function is assigned according to the shearing stress distribution across the plate thickness, and satisfies the zero traction boundary conditions on the top and bottom surfaces of the plate without using any shear correction factors. The equations of motion associated with the present theory are obtained using the principle of virtual work. The analytical solution of the buckling of simply supported plates subjected to uniaxial and biaxial loading conditions was obtained using the Navier method. The critical buckling load results for thick isotropic square plates are compared with various available results in the literature given by other theories. From the present analysis, it can be concluded that the proposed theory is accurate and efficient in predicting the buckling response of isotropic plates.