scholarly journals Deformating of a viscoelastic disk rotating with acceleration

2020 ◽  
pp. 143-151
Author(s):  
Александра Сергеевна Бегун ◽  
Лариса Валентиновна Ковтанюк
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress State ◽  
Finite Difference Method ◽  
Axisymmetric Problem ◽  
Plane Stress State ◽  
Constant Thickness ◽  
The Finite Element Method ◽  
Hard Inclusion ◽  
The Finite Difference Method

Рассматривается деформирование вязкоупругого диска, вращающегося с изменяющейся скоростью (разгон, торможение и вращение с постоянной скоростью). Для математического моделирования процесса деформирования используется теория течения. При предположении плоского напряженного состояния получена система дифференциальных уравнений для определения полей напряжений, обратимых и необратимых деформаций и перемещений. Численное решение этой системы уравнений найдено с помощью конечно-разностного метода. В случае решения осесимметричной задачи используется метод конечных элементов, реализованный в пакете Freefem++. Рассмотрено деформирование полого диска и диска с жестким включением, как постоянной толщины, так и переменной. The deformation of a viscoelastic disk rotating with a changing speed is considered. Within the framework of the theory of flow, relations are obtained that allow one to calculate the fields of stresses, strains, displacements, and velocities. To solve these equations in the case of a plane stress state, the finite-difference method is used, in the case of an axisymmetric problem, the finite element method implemented in the Freefem ++ package is used. Acceleration, braking and rotation at a constant speed are considered. The deformation of a hollow disk and a disk with a hard inclusion of both a constant thickness and a variable is considered.

Sharpening of metal sheets during electrochemical polishing. Theory and experiments

1984 ◽  
Vol 49 (5) ◽  
pp. 1267-1276
Author(s):  
Petr Novák ◽  
Ivo Roušar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Difference Method ◽  
The Finite Element Method ◽  
Electrochemical Polishing ◽  
Electrochemical Parameters ◽  
Metal Sheets ◽  
The Finite Difference Method ◽  
Shape Changes ◽  
Theory And Experiments

The electrochemical polishing with simultaneous shape changes of anodes was studied. A theory was derived based on the knowledge of basic electrochemical parameters and the solution of the Laplace equation. To this purpose, the finite element method and the finite difference method with a double transformation of the inter-electrode region were employed. Only the former method proved well and can therefore be recommended for different geometries.

HIGHER-ORDER MASS-LUMPED FINITE ELEMENTS FOR THE WAVE EQUATION

2001 ◽  
Vol 09 (02) ◽  
pp. 671-680 ◽  
Author(s):  
W. A. MULDER
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wave Propagation ◽  
Wave Equation ◽  
Finite Elements ◽  
Finite Difference Method ◽  
Seismic Wave Propagation ◽  
The Finite Element Method ◽  
Efficient Scheme ◽  
The Finite Difference Method

The finite-element method (FEM) with mass lumping is an efficient scheme for modeling seismic wave propagation in the subsurface, especially in the presence of sharp velocity contrasts and rough topography. A number of numerical simulations for triangles are presented to illustrate the strength of the method. A comparison to the finite-difference method shows that the added complexity of the FEM is amply compensated by its superior accuracy, making the FEM the more efficient approach.

scholarly journals The optimal dimensions of the domain for solving the single-band Schrödinger equation by the finite-difference and finite-element methods

2014 ◽  
Vol 11 (1) ◽  
pp. 73-84 ◽  
Author(s):  
Dusan Topalovic ◽  
Stefan Pavlovic ◽  
Nemanja Cukaric ◽  
Milan Tadic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Finite Element Methods ◽  
Ground State ◽  
Difference Method ◽  
Grid Size ◽  
The Finite Element Method ◽  
The Finite Difference Method

The finite-difference and finite-element methods are employed to solve the one-dimensional single-band Schr?dinger equation in the planar and cylindrical geometries. The analyzed geometries correspond to semiconductor quantum wells and cylindrical quantum wires. As a typical example, the GaAs/AlGaAs system is considered. The approximation of the lowest order is employed in the finite-difference method and linear shape functions are employed in the finite-element calculations. Deviations of the computed ground state electron energy in a rectangular quantum well of finite depth, and for the linear harmonic oscillator are determined as function of the grid size. For the planar geometry, the modified P?schl-Teller potential is also considered. Even for small grids, having more than 20 points, the finite-element method is found to offer better accuracy than the finite-difference method. Furthermore, the energy levels are found to converge faster towards the accurate value when the finite-element method is employed for calculation. The optimal dimensions of the domain employed for solving the Schr?dinger equation are determined as they vary with the grid size and the ground-state energy.

Finite-Difference Method Appliance to the Computation of Ground Additional Stress and Settlement of Storage Tank

2011 ◽  
Vol 243-249 ◽  
pp. 2638-2642
Author(s):  
Xu Dong Cheng ◽  
Wen Shan Peng ◽  
Lei Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Storage Tank ◽  
Three Dimensional ◽  
Additional Stress ◽  
The Finite Element Method ◽  
The Finite Difference Method

This paper adopts the Finite-difference method to research the distribution of ground additional stress and distortion in differently isotropic and non-isotropic foundation conditions, and uses the Finite-difference method to compare with the Finite-element method and the three-dimensional settlement method used by the code. Through comparative analysis, the reliability and superiority of Finite-difference method used for calculating ground additional stress and settlement are justified.

scholarly journals The finite difference versus the finite element method for the solution of boundary value problems

1984 ◽  
Vol 29 (2) ◽  
pp. 267-288
Author(s):  
Vidar Thomée
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Boundary Value Problems ◽  
Boundary Value ◽  
The Finite Element Method ◽  
Discretization Schemes ◽  
The Finite Difference Method ◽  
Element Method

In this lecture we describe, discuss and compare the two classes of methods most commonly used for the numerical solution of boundary value problems for partial differential equations, namely, the finite difference method and the finite element method. For both of these methods an extensive development of mathematical error analysis has taken place but individual numerical analysts often express strong prejudices in favor of one of them. Our purpose is to try to convey our conviction that this attitude is both historically unjustified and inhibiting, and that familiarity with both methods provides a wider range of techniques for constructing and analyzing discretization schemes.

Stress Wave Propagation in Cracked Geological Solids Using Finite Difference Scheme

2018 ◽  
Vol 09 (01) ◽  
pp. 1750009
Author(s):  
P. A. Kakavas ◽  
N. A. Kalapodis
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wave Propagation ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Scheme ◽  
Analytical Solutions ◽  
Stress Wave Propagation ◽  
The Finite Element Method ◽  
The Finite Difference Method

The aim of this study is the numerical computation of the wave propagation in crack geological solids. The finite difference method was applied to solve the differential equations involved in the problem. Since the problem is symmetric, we prefer to use this technique instead of the finite element method and/or boundary elements technique. A comparison of the numerical results with analytical solutions is provided.

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