scholarly journals Thermoelastic Problem for a Free Square Plate: Exact Solution

2021 ◽  
Vol 1936 (1) ◽  
pp. 012008
Author(s):  
A P Kerzhaev
Author(s):  
Т.П. Кныш ◽  
М.В. Сухотерин ◽  
С.О. Барышников

Задача изгиба прямоугольной панели обшивки от действия распределенной по оси симметрии поперечной нагрузки не имеет точного решения в конечном виде в виду сложности краевых условий и вида нагрузки. Использование другими авторами различных приближенных методов оставляет открытым вопрос о точности полученных результатов. Целью исследования является получение точного решения с помощью гиперболо-тригонометрических рядов по двум координатам. Для этого используется метод бесконечной суперпозиции указанных рядов, которые в отдельности удовлетворят лишь части граничных условий. Порождаемые ими невязки взаимно компенсируются в ходе итерационного процесса и стремятся к нулю. Частное решения представлено двойным рядом Фурье. Точное решение достигается увеличением количества членов в рядах и числа итераций. При достижении заданной точности процесс прекращается. Получены численные результаты для прогибов и изгибающих моментов для квадратной пластины при различной длине загруженной части оси пластины. Представлены 3D-формы изогнутой поверхности пластины и эпюры изгибающих моментов. The problem of bending a rectangular skin panel from the action of a transverse load distributed along the axis of symmetry does not have an exact solution in the final form due to the complexity of the boundary conditions and the type of load. The use of various approximate methods by other authors leaves open the question of the accuracy of the results obtained. The aim of the study is to obtain an exact solution using hyperbolo-trigonometric series in two coordinates. To do this, we use the method of infinite superposition of these series, which individually satisfy only part of the boundary conditions. The residuals generated by them are mutually compensated during the iterative process and tend to zero. The quotient of the solution is represented by a double Fourier series. The exact solution is achieved by increasing the number of terms in the series and the number of iterations. When the specified accuracy is reached, the process stops. Numerical results are obtained for deflections and bending moments for a square plate with different lengths of the loaded part of the plate axis. 3D shapes of the curved surface of the plate and diagrams of bending moments are presented.


1947 ◽  
Vol 14 (1) ◽  
pp. A55-A62
Author(s):  
W. B. Stiles

Abstract The exact solution of thin rectangular plates clamped on all or part of the boundary requires the solution of two infinite sets of simultaneous equations in two sets of unknowns. A method of obtaining an approximate solution based upon minimization of energy and requiring the solution of the first i equations of a single infinite set of simultaneous equations is described and illustrated in this paper. The approximation functions are derived from functions representing the normal modes of a freely vibrating membrane for the same region. Solutions are obtained for a rectangular clamped plate supporting a uniform or a central point load and for a square plate clamped on two adjacent edges and pinned on the other two edges with either a uniform or a central point load. Analytical results are compared with experimentally determined deflections and stresses.


1952 ◽  
Vol 19 (2) ◽  
pp. 179-184
Author(s):  
C. C. Chang ◽  
H. D. Conway

Abstract This paper presents a solution to the small-deflection problem of the uniformly loaded rectangular plate with all edges clamped, when the latter are subjected to uniform tensile or compressive forces in the plane of the plate. Since an exact solution to the problem is hardly possible, the Marcus method was used for the approximate solution of the biharmonic equation, subject to the conditions of zero slope and deflection at the boundary. Deflections and moments are presented for a square plate with four particular values of tensile end load, and for the rectangular plate with seven length-breadth ratios and with one value of compressive end load.


2021 ◽  
Vol 1730 (1) ◽  
pp. 012142
Author(s):  
I V Menshova ◽  
A P Kerzhaev ◽  
G Yu ◽  
X Zeng

Known exact solutions in limit analysis for rigid-perfectly plastic plates are relatively scarce because of their probable complexity even for simple loading and edge conditions. This complexity is exemplified in the present exact solution for the problem of a uniformly distributed load on a clamped square plate of isotropic homogeneous material obeying the square yield criterion in bending. The solution is extended to cover the case of a uniformly distributed load on a clamped plate of any regular polygonal shape. A comparison of the present exact results and those of Fox (1972) with earlier upper bound solutions is evidence that close upper bounds for the collapse load will normally be obtainable by the use of assumed mechanisms much simpler than the exact mechanism.


1986 ◽  
Vol 47 (6) ◽  
pp. 1029-1034 ◽  
Author(s):  
J.C. Parlebas ◽  
R.H. Victora ◽  
L.M. Falicov

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