Instability Analysis of Thin Rectangular Plates Using the Kantorovich Method

1975 ◽  
Vol 42 (1) ◽  
pp. 110-114 ◽  
Author(s):  
T. R. Grimm ◽  
J. C. Gerdeen
Keyword(s):  
Solution Method ◽  
Compressive Load ◽  
Classical Solutions ◽  
Rectangular Plates ◽  
Kantorovich Method ◽  
Extended Kantorovich Method ◽  
Plate Buckling ◽  
Method Of Solution ◽  
Solution Verification ◽  
Numerical Method Of Solution

The extended Kantorovich method is used to obtain solutions for a large number of previously unsolved elastic buckling problems of thin rectangular plates. In the present work, this method is specially adapted to a numerical method of solution. Verification of the solution method is made by solving a large number of plate buckling problems with known classical solutions. Included among the new problems solved are plates with a variety of boundary conditions, plates on elastic foundations, and plates with a variable inplane compressive load applied to only one edge, together with several different in-plane prestress configurations to increase the magnitude of the critical stress.

SHEAR BUCKLING OF THIN PLATES WITH CONSTANT IN-PLANE STRESSES

2007 ◽  
Vol 07 (02) ◽  
pp. 179-192 ◽  
Author(s):  
IGOR SHUFRIN ◽  
MOSHE EISENBERGER
Keyword(s):  
Shear Loading ◽  
Buckling Load ◽  
Thin Plates ◽  
Rectangular Plates ◽  
Kantorovich Method ◽  
Plane Shear ◽  
Buckling Loads ◽  
Extended Kantorovich Method ◽  
Tension And Compression ◽  
Shear Buckling

This work presents highly accurate numerical calculations of the buckling loads for thin elastic rectangular plates with known constant in-plane stresses, and in-plane shear loading that is increased until the critical load is obtained and the plate losses its stability. The solutions are obtained using the multi-term extended Kantorovich method. The solution is sought as the sum of multiplications of two one-dimensional functions. In this method a solution is assumed in one direction of the plate, and this enables transformation of the partial differential equation of the plate equilibrium into a system of ordinary differential equations. These equations are solved exactly by the exact element method, and an approximate buckling load is obtained. In the second step, the derived solution is now taken as the assumed solution in one direction, and the process is repeated to find an improved buckling load. This process converges with a small number of solution cycles. For shear buckling this process can only be used if two or more terms are taken in the expansion of the solution. Many examples are given for shear buckling loads for various cases of tension and compression bi-directional loading.

Numerical Methods for Solving Physically Nonlinear Problems for Inhomogeneous Thick-Walled Shells

2017 ◽  
Vol 865 ◽  
pp. 325-330 ◽  
Author(s):  
Vladimir I. Andreev ◽  
Lyudmila S. Polyakova
Keyword(s):  
Numerical Method ◽  
Nonlinear Problems ◽  
Successive Approximations ◽  
Method Of Successive Approximations ◽  
Deformation Diagram ◽  
Method Of Solution ◽  
Properties Of Materials ◽  
Physical Fields ◽  
Cylinders And Spheres ◽  
Numerical Method Of Solution

The paper proposes the numerical method of solution the problems of calculation the stress state in thick-walled cylinders and spheres from physically nonlinear inhomogeneous material. The urgency of solved problem due to the change of mechanical properties of materials under the influence of different physical fields (temperature, humidity, radiation, etc.). The deformation diagram describes the three-parameter formula. The numerical method used the method of successive approximations. The results of numerical calculation are compared with the test analytical solutions obtaining the authors with some restrictions on diagram parameters. The obtained results can be considered quite satisfactory.

Free Vibration Analysis of Symmetrically Laminated Fully Clamped Skew Plates Using Extended Kantorovich Method

2011 ◽  
Vol 471-472 ◽  
pp. 739-744 ◽  
Author(s):  
Ali Fallah ◽  
Mohammad Hossein Kargarnovin ◽  
Mohammad Mohammadi Aghdam
Keyword(s):  
Differential Equation ◽  
Free Vibration ◽  
Vibration Analysis ◽  
Closed Form Solution ◽  
Free Vibration Analysis ◽  
Composite Plates ◽  
Power Series Solution ◽  
Order Partial Differential Equation ◽  
Kantorovich Method ◽  
Extended Kantorovich Method

In this paper, free vibration analysis of thin symmetrically laminated skew plates with fully clamped edges is investigated. The governing differential equation for skew plate which is a fourth order partial differential equation (PDE) is obtained by transforming the differential equation in Cartesian coordinates into skew coordinates. Based on the multi-term extended Kantorovich method (MTEKM) an efficient and accurate approximate closed-form solution is presented for the governing PDE. Application of the MTEKM reduces the governing PDE to a dual set of ordinary differential equations. These sets of equations are then solved with infinite power series solution, in an iterative manner until convergence was achieved. Results of this study show the fast rate of convergence of the MTEKM. Usually two or three iterations are enough to obtain reasonably accurate results. The frequency parameters of laminated composite plates are obtained for different skew angles and lay-up configuration for different composites laminates skew plates. Comparisons have been made with the available results in the literature which show the accuracy and efficiency of the method.

Sign in / Sign up

Export Citation Format

Share Document