检索结果-南通市图书馆

Influence of magnetic field on free vibrations in elastodynamic problem of orthotropic hollow sphere

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2014年第8期35卷 1051-1066页

作者： S.R.mAHmOUD a.m.abd-alla Department of mathematics Science FacultyKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of mathematics Science FacultySohag UniversitySohag 82524Egypt

The effect of magnetic field on the plane vibrations for an elastodynamic orthotropic sphere is studied. Equations of elastodynamic problems of the orthotropic hollow sphere in terms of displacement are solved. The numerical results of the frequency equations in the presence of magnetic field are discussed and shown graphically. Compar-isons are made with the result in the presence and absence of magnetic field in the case of orthotropic sphere. The results show that the effect of magnetic field is very pronounced.

关键词： magnetic field elastodynamic orthotropic free vibration hollow sphere

Plane Vibrations in a Transversely Isotropic Infinite Hollow Cylinder Under Effect of the Rotation and magnetic Field

在线全文

学校读者我要写书评

暂无评论

Computer modeling in Engineering & Sciences 2017年第2期113卷 151-170页

作者： F.S.Bayones a.m.abd-alla math.Dept. Faculty of ScienceTaif UniversitySaudi Arabia mathematics Department Faculty of ScienceSohagEgypt

The aim of this paper is to study the effects of rotation and magnetic field on the plane vibrations in a transversely isotropic material of an infinite hollow *** natural frequency of the plane vibrations in the case of harmonic vibrations has been *** natural frequencies are calculated numerically and the effects of rotation and magnetic field are *** numerical results obtained have been illustrated graphically to understand the behavior of frequency equation with different values of frequencyωunder effects the rotation and magnetic *** was made with the results obtained in the presence and absence of the rotation and magnetic *** results indicate that the effect of rotation and magnetic field are very pronounced.

关键词： Plane transversely isotropic rotating magnetic field homogeneous transversely isotropic Natural frequencies

Effect of rotation on the surface wave propagation in magneto-thermoelastic materials with voids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2018年第4期3卷 334-342页

作者： A.m.Farhan a.m.abd-alla Physics Department Faculty of ScienceJazan UniversitySaudi Arabia Physics Department Faculty of ScienceZagzig UniversityEgypt mathematics Department Faculty of ScienceSohag UniversityEgypt

The present investigation is focused on studying the surface wave propagation in a generalized magneto-thermoelastic materials taking(Green Lindsay)model with *** general surface wave speed is derived to study the effects of magnetic field and rotation on surface wave in the presence of *** addition the present study can be comprehensively applied to the magneto-thermoelastic medium with *** possible non-dimensional frequency of surface wave propagation has been obtained as the solution of an algebraic equation involving a determinant whose elements contain the material parameters,the direction of applied magnetic field and rotation of surface wave *** comparisons for the physical quantities are established numerically and represented graphically in different cases with respect to the used effects.

关键词： Green Lindsay theory Thermoelasticity Surface waves.

Effects of rotation and gravity on an electro-magneto-thermoelastic medium with diffusion and voids by using the Lord-Shulman and dual-phase-lag models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2019年第8期40卷 1135-1154页

作者： S.m.ABO-DAHAB a.m.abd-alla A.A.KILANY Department of mathematics Faculty of SciencesTaif UniversityTaif 888Saudi Arabia Department of mathematics Faculty of ScienceSouth Valley UniversityQena 83523Egypt Department of mathematics Faculty of ScienceSohag UniversitySohag 82524Egypt

The effects of rotation and gravity on an electro-magneto-thermoelastic medium with diffusion and voids in a generalized thermoplastic half-space are studied by using the Lord-Shulman (L-S) model and the dual-phase-lag (DPL) model. The analytical solutions for the displacements, stresses, temperature, diffusion concentration, and volume fraction field with different values of the magnetic field, the rotation, the gravity, and the initial stress are obtained and portrayed graphically. The results indicate that the effects of gravity, rotation, voids, diffusion, initial stress, and electromagnetic field are very pronounced on the physical properties of the material.

关键词： electromagnetic field gravity field rotation initial stress voids diffusion normal mode analysis Lord-Shulman (L-S) model dual-phase-lag (DPL) model

Effect of magnetic field on poroelastic bone model for internal remodeling

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2013年第7期34卷 889-906页

作者： a.m.abd-alla S.m.ABO-DAHAB Department of mathematics Faculty of Sciences Taif University Department of mathematics Faculty of Science Sohag University Department of mathematics Faculty of Science South Valley University

This paper studies the effects of the magnetic field and the porosity on a poroelastic bone model for internal remodeling. The solution of the internal bone remodeling process induced by a magnetic field is presented. The bone is treated as a poroelastic material by Biot＇s formulation. Based on the theory of small strain adaptive elasticity, a theoretical approach for the internal remodeling is proposed. The components of the stresses, the displacements, and the rate of internal remodeling are obtained in analytical forms, and the numerical results are represented graphically. The results indicate that the effects of the magnetic field and the porosity on the rate of internal remodeling in bone are very pronounced.

关键词： wave propagation poroelastic wet bone internal remodeling magnetic field

Numerical Solution of a Problem of Thermal Stresses of a magnetothermoelastic Cylinder with Rotation by Finite-Difference method

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2021年第9期68卷 3339-3352页

作者： F.S.Bayones a.m.abd-alla A.m.Farhan Department of mathematics and Statistics College of ScienceTaif UniversityTaif21944Saudi Arabia Department of mathematics Faculty of ScienceSohag UniversityEgypt Physics Department Faculty of ScienceJazan UniversityJazanSaudi Arabia Physics Department Faculty of ScienceZagazig UniversityZagazigEgypt

The present article deals with the investigation thermal stress of a magnetothermoelastic cylinder subjected to rotation,open or closed circuit,thermal and mechanical boundary *** outer and inner surfaces of the cylinder are subjected to both mechanical and thermal boundary conditions.A The transient coupled thermoelasticity in an infinite cylinder with its base abruptly exposed to a heat flux of a decaying exponential function of time is devised solve by the finite-difference *** fundamental equations’system is solved by utilizing an implicit finite-difference *** current method is a second-order accurate in time and space;it is also unconditionally *** illustrate the present model’s efficiency,we consider a suitable material and acquire the numerical solution of temperature,displacement components,and the components of stresses with time t and through the radial of an infinite *** results indicate that the effect of coupled thermoelasticity,magnetic field,and rotation on the temperature,stresses,and displacement is quite *** order to illustrate and verify the analytical developments,the numerical solution of partial differential equations,stress components,displacement components and temperature is carried out and computer simulated results are presented *** study is helpful in the development of piezoelectric devices.

关键词： Thermoelasticity thermal stress finite-difference method non-homogeneous material rotation magnetic field

Solution of a problem of thermal stresses in a non-homogeneous thermoelastic infinite medium of isotropic material by finite difference method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2019年第3期4卷 256-262页

作者： A.m.Farhan a.m.abd-alla moaiad A.Khder Physics Department Faculty of ScienceJazan UniversitySaudi Arabia Physics Department Faculty of ScienceZagzig UniversityEgypt mathematics Department Faculty of ScienceSohag UniversityEgypt Department of Computer Science Applied Science UniversityBahrain

The present work deals with a new problem of thermoelasticity for an infinitely long and isotropic circular cylinder of temperature dependent physical *** inner and outer curved surfaces of the cylinder are subjected to both the mechanical and thermal boundary conditions.A finite difference model is developed to derive the solution of the problem in which the governing equations are uncoupled linear partial differential *** transient solution at any time can be evaluated directly from the *** order to demonstrate the efficiency of the present model we consider a suitable material and obtain the numerical solution of displacement,temperature,and stresses inside the cylinder for the homogeneous-dependent material properties of the *** results are analyzed with the help of different graphical plots.

关键词： Thermal stress Thermoelasticity Wave propagation Finite difference method Non-homogeneous medium

Reflection of PlaneWaves from Electro-magneto-thermoelastic Half-space with a Dual-Phase-Lag model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, materials & Continua 2016年第2期51卷 63-79页

作者： a.m.abd-alla mohamed I.A.Othman S.m.Abo-Dahab math.Dept. Faculty of ScienceTaif University 888Saudi Arabia Department of mathematics Faculty of ScienceSohag UniversityEgypt math.Dept. Faculty of ScienceZagazig UniversityP.O.Box 44519ZagazigEgypt math.Dept. Faculty of ScienceSouth Valley UniversityQena 83523Egypt

The aim of this paper is to study the reflection of plane harmonic waves from a semi-infinite elastic solid under the effect of magnetic field in a *** expressions for the reflection coefficients,which are the relations of the amplitudes of the reflected waves to the amplitude of the incident waves,are ***,the reflection coefficient ratio variations with the angle of incident under different conditions are shown *** are made with the results predicted by the dual-phase-lag model and Lord-Shulman theory in the presence and absence of magnetic field.

关键词： Reflection Generalized thermoelasticity magnetic field Dual-phaselag model

Electromagnetic field in fiber-reinforced micropolar thermoelastic medium using four models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2020年第3期5卷 230-248页

作者： S.m.Abo-Dahab a.m.abd-alla A.A.Kilany Dept.of mathematics Faculty of ScienceTaif University 888Saudi Arabia Dept.of mathematics Faculty of ScienceSohag UniversityEgypt Dept.of mathematics Faculty of ScienceSVUQena 83523Egypt

This paper aimed to study the effect of electromagnetic field on general model of the equations of the generalized thermoelasticity reinforcement of the deformation of a micropolar generalized thermoelastic *** phenomenon is in the context of the couple theory(C-D),Lord-Shulman(L-S)and Green-Lindsay(G-L)as well as the Dual-Phase-Lag(DPL)*** normal mode technique is used to find the exact expressions components of displacement,force stress,and *** modifications of the considered variables with the horizontal distance are illustrated graphically to show the distance values that reduce to the variables *** are made with the results in the absence and presence of electromagnetic field for the general of reinforcement on the total deformation of a micropolar thermoelastic *** results obtained are calculated numerically and displayed by the graphs to show the effect of the entered new parameters on the phenomena.

关键词： Electro-magneto-thermoelasticity micropolar Fiber-reinforced Lord-Shulman Green-Lindsay Dual-phase-lag